DC-DC Converters
Products (40)
ST1S41PUR - 3A, 18V Step-Down DC-DC Converter | STMicroelectronics
The ST1S41PUR is a high-efficiency, monolithic step-down switching regulator from STMicroelectronics, designed to deliver up to 3A of continuous output current from an input voltage range of 4V to 18V. Housed in a compact DFN8 (3x3 mm) package, this device integrates a low-side MOSFET and synchronous rectification to achieve efficiencies up to 90%, making it suitable for a wide range of power conversion applications. A step-down (buck) DC-DC converter is a type of switching regulator that efficiently reduces a higher input voltage to a lower output voltage. Unlike linear regulators, which dissipate excess power as heat, buck converters use inductive energy storage and high-frequency switching to achieve high efficiency, especially when the input-to-output voltage difference is large. In the power management hierarchy, a buck converter falls under DC-DC converters, which are a subset of voltage regulators, which in turn are part of the broader power management IC category. This hierarchy is essential for understanding where the ST1S41PUR fits in system-level power architecture. Key features of the ST1S41PUR include an adjustable output voltage from 0.8V to VIN, a switching frequency of 850 kHz (with a range of 700 kHz to 1 MHz), and a low quiescent current of 1.5 mA. The device also offers overcurrent protection, thermal shutdown, and an enable pin for power sequencing. The DFN8 package provides a small footprint with a thermal resistance of 40 C/W, enabling compact designs without external heatsinking at moderate power levels. The ST1S41PUR utilizes a current-mode control architecture with an internal compensation network, simplifying the external component count. The high switching frequency allows the use of small inductors and capacitors, reducing the overall solution size. The device also features a power-good output that can be used for sequencing and monitoring in multi-rail systems. Typical applications include point-of-load (POL) converters for FPGAs, DSPs, and microcontrollers, as well as distributed power systems in industrial and consumer electronics. The wide input range also supports 12V and 24V bus systems, making it versatile for various power rails. When designing with this device, ensure proper input and output capacitor selection to minimize ripple and maintain stability. The enable pin allows controlled startup, and the power-good signal can be used for system sequencing. Thermal considerations are important at high load currents; adequate copper area on the PCB is recommended to dissipate heat effectively.
ST1S50PUR - 3A, 18V Synchronous Step-Down Converter | STMicroelectronics
The ST1S50PUR is a high-efficiency, synchronous step-down DC-DC converter from STMicroelectronics, designed to deliver up to 3A of continuous output current from an input voltage range of 4V to 18V. Housed in a compact DFN8 (3x3 mm) package, this device integrates both high-side and low-side power MOSFETs, eliminating the need for an external Schottky diode and simplifying PCB layout. The output voltage is adjustable from 0.8V to VIN, allowing flexibility for a wide range of applications. A synchronous buck converter is a type of DC-DC step-down regulator that uses two active switches (typically MOSFETs) instead of a diode for the low-side element, which significantly improves efficiency, especially at lower output voltages. This architecture is fundamental in power management ICs, where efficiency directly impacts battery life, thermal management, and system reliability. The ST1S50PUR belongs to the family of synchronous step-down converters, which are essential building blocks in modern electronic systems, from portable devices to industrial equipment. Key features of the ST1S50PUR include a fixed 1.5 MHz switching frequency, which allows the use of small, low-cost inductors and capacitors, reducing the overall solution footprint. The device offers a typical efficiency of 90% at 3A load, with a low quiescent current of 1.2 mA in light-load operation. It also features internal soft-start to limit inrush current, overcurrent protection, and thermal shutdown for robust operation. The DFN8 package has an exposed pad for enhanced thermal performance, with a thermal resistance of 40°C/W. The ST1S50PUR utilizes a current-mode control architecture, providing fast transient response and stable operation over a wide range of input and output voltages. The integrated MOSFETs have low RDS(on) (typically 120 mΩ high-side and 80 mΩ low-side), minimizing conduction losses. The device operates over a junction temperature range of -40°C to +150°C, making it suitable for demanding environments. Typical applications include point-of-load (POL) converters for FPGAs, DSPs, and microcontrollers, as well as power supplies for set-top boxes, networking equipment, and industrial control systems. The wide input voltage range also supports 12V and 24V bus systems, making it versatile for various power architectures. When designing with the ST1S50PUR, ensure proper input and output capacitor selection to maintain stability and minimize ripple. The exposed pad should be soldered to a large copper area for effective heat dissipation. The EN pin allows for power sequencing, and the soft-start feature prevents output overshoot during startup.
STNRG011ATR - Digital Power Controller for SMPS | STMicroelectronics
The STNRG011ATR is a digital power controller from STMicroelectronics designed for switched-mode power supplies (SMPS). It integrates a digital control core with a high-voltage startup cell, making it suitable for flyback, buck, and boost converter topologies. The device operates from an input voltage range of 8.5V to 23V and provides a gate drive output capable of sourcing 0.5A and sinking 0.8A. It is housed in a 16-pin SO-16 package, offering a compact solution for power supply designs. A digital power controller is a type of power management IC that uses digital signal processing to regulate output voltage and current, replacing traditional analog control loops. It sits within the hierarchy of power management ICs, which include linear regulators, switching regulators, and digital power controllers. Digital controllers offer advantages such as programmability, higher efficiency, and better transient response compared to analog counterparts. Key features of the STNRG011ATR include a programmable switching frequency up to 1 MHz, an integrated high-voltage startup cell that reduces standby power consumption, and a digital control loop that can be configured via an I2C interface. The device also includes protection features such as overcurrent protection, overvoltage protection, and thermal shutdown, ensuring reliable operation in demanding environments. The STNRG011ATR utilizes a digital control architecture with a dedicated state machine and a configurable PID compensator. This allows designers to optimize the control loop for specific power stage characteristics without changing external components. The integrated high-voltage startup cell enables fast startup and low standby power, making it ideal for applications requiring energy efficiency standards compliance. Typical applications include AC-DC adapters, USB Power Delivery (USB-PD) chargers, and industrial power supplies. The device's digital control capability allows for precise voltage and current regulation, which is essential for USB-PD applications that require multiple output voltage levels. Its wide input voltage range and high switching frequency support compact transformer designs, reducing overall solution size. When designing with the STNRG011ATR, ensure proper layout of the high-voltage startup cell and gate drive traces to minimize parasitic inductance. The I2C interface should be isolated from high-voltage areas to prevent noise coupling. Additionally, the thermal pad should be connected to a large copper area for effective heat dissipation.
STPM066S - 66V Step-Down DC-DC Converter | STMicroelectronics
The STPM066S is a high-voltage step-down DC-DC converter from STMicroelectronics, designed to deliver efficient power conversion in industrial and automotive applications. It operates from a wide input voltage range of 4.5V to 66V, making it suitable for 12V, 24V, and 48V bus systems. The device provides a continuous output current of up to 3A, with an adjustable output voltage down to 0.8V. Housed in a compact QFN-16 package (4x4 mm), the STPM066S integrates high-side and low-side MOSFETs, reducing external component count and simplifying PCB layout. A step-down DC-DC converter, also known as a buck converter, is a type of switching regulator that efficiently reduces a higher input voltage to a lower output voltage. Unlike linear regulators, which dissipate excess power as heat, buck converters use inductive energy storage and high-frequency switching to achieve efficiencies often exceeding 90%. This makes them essential in power management systems where thermal budget and battery life are critical. The STPM066S belongs to the broader category of power management ICs, specifically within DC-DC converters, and is a key building block in distributed power architectures. Key features of the STPM066S include a peak efficiency of 95%, a switching frequency adjustable from 200kHz to 2.2MHz, and a low quiescent current of 40uA in light-load mode. The device also offers a precision enable pin with hysteresis, soft-start to limit inrush current, and comprehensive protection features including overcurrent, overvoltage, and thermal shutdown. The integrated MOSFETs have low RDS(on) of 80mOhm (high-side) and 40mOhm (low-side), minimizing conduction losses. Technically, the STPM066S employs a current-mode control architecture, providing fast transient response and stable operation with a wide range of output capacitors. The adjustable switching frequency allows designers to optimize efficiency versus component size, while the external compensation pin offers flexibility in loop tuning. The device is available in a QFN-16 package with an exposed thermal pad, achieving a thermal resistance of 25°C/W, enabling reliable operation at high ambient temperatures. Typical applications include industrial power supplies, automotive infotainment systems, battery-powered equipment, and distributed power architectures in telecom and networking equipment. The wide input range and high efficiency make it ideal for pre-regulation in multi-rail systems, where it steps down a high-voltage bus to an intermediate rail for downstream LDOs or point-of-load converters. When designing with the STPM066S, ensure proper input and output capacitor selection to minimize voltage ripple and maintain stability. The bootstrap capacitor for the high-side driver must be placed close to the BST pin, and the feedback network should be routed away from the inductor to avoid noise coupling. Adequate copper pour on the thermal pad is essential for heat dissipation at high output currents.
TL494CDT - PWM Controller IC | STMicroelectronics | SMPS
The TL494CDT is a fixed-frequency pulse-width modulation (PWM) control circuit from STMicroelectronics, designed primarily for switch-mode power supplies (SMPS). It integrates all the functions required for a single-ended or push-pull switching power supply, including an internal oscillator, error amplifiers, a 5V reference, and output control logic. The device operates from a supply voltage of 7V to 40V and is available in a 16-pin SOIC (SOP-16) package, making it suitable for compact power supply designs. A PWM controller is a specialized integrated circuit that generates a variable-duty-cycle square wave to regulate the output voltage of a switching power supply. It compares a feedback signal to a reference voltage and adjusts the duty cycle of the output transistors accordingly. The TL494 belongs to the family of voltage-mode PWM controllers, which are widely used in offline and DC-DC converters due to their simplicity and robustness. This category sits within the broader hierarchy of power management ICs, which also includes linear regulators, switching regulators, and battery management devices. Key features of the TL494CDT include a complete PWM power-control circuitry, an uncommitted output for single-ended or push-pull operation, an internal oscillator with a frequency range of 1kHz to 300kHz, and a 5V reference with 5% tolerance. It also provides an error amplifier with a common-mode voltage range of -0.3V to VCC-2V, a dead-time control comparator, and a standby current of typically 6mA. These features enable precise regulation and protection in various power conversion topologies. The TL494CDT uses a bipolar process technology, offering a proven and reliable architecture that has been in production for decades. It includes an internal 5V reference that can source up to 10mA for external use, and its output stage can sink or source up to 250mA. The device also features a shutdown control pin that can be used for overcurrent or overvoltage protection, and its dead-time control allows adjustment of the minimum off-time to prevent transformer saturation in push-pull designs. Typical applications include switch-mode power supplies for computers, telecom equipment, industrial systems, and battery chargers. The TL494CDT is also used in DC-DC converters, inverters, and motor control circuits. Its wide supply voltage range and flexible output configuration make it a versatile choice for both single-ended and push-pull topologies. When designing with the TL494CDT, it is important to properly set the oscillator frequency using external timing components (RT and CT) and to ensure adequate decoupling of the VCC pin. The dead-time control pin should be used to prevent shoot-through in push-pull stages, and the error amplifier compensation network must be designed for stable loop operation. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the STMicroelectronics datasheet, providing a comprehensive resource for engineers selecting a PWM controller for their power supply design.
TNY277GN - 18.5W Offline Flyback Switcher | Power Integrations
The Power Integrations TNY277GN is an energy-efficient, off-line switcher IC from the TinySwitch-III family, designed for flyback power supplies. It integrates a 700 V power MOSFET, oscillator, high-voltage switched current source, user-selectable current limit, and thermal shutdown circuitry in a compact SMD-8C package. The device operates at a fixed switching frequency of 132 kHz and delivers up to 18.5 W output power from a universal input range of 85 VAC to 265 VAC, or 23.5 W from 230 VAC. Its simple ON/OFF control scheme eliminates the need for loop compensation, reducing external component count and system cost. An off-line switcher is a power management IC that converts AC mains voltage directly to a regulated DC output, typically using a flyback or buck topology. It integrates the power switch (MOSFET) and control circuitry into a single package, simplifying the design of AC-DC power supplies. The TinySwitch-III family is a specific series of off-line switchers from Power Integrations, known for their high efficiency, low standby power, and ease of use. These ICs are widely used in chargers, adapters, and auxiliary power supplies. Key features of the TNY277GN include a 700 V MOSFET for wide input voltage handling, a user-selectable current limit for design flexibility, and built-in thermal shutdown for protection. The device also features frequency jittering to reduce EMI, making it easier to meet electromagnetic compatibility standards. Its ON/OFF control scheme provides excellent load regulation without the need for an optocoupler in many designs, simplifying the feedback loop. Technically, the TNY277GN uses a current-mode control architecture with a high-voltage switched current source for startup, eliminating the need for a separate startup resistor. The device's EcoSmart technology ensures low standby power consumption, making it suitable for energy-efficient applications. The SMD-8C package is designed for surface-mount assembly, offering a compact footprint for space-constrained designs. Typical applications include AC-DC adapters, battery chargers, standby power supplies for TVs and monitors, and auxiliary power supplies for appliances. The TNY277GN is particularly well-suited for applications requiring high efficiency and low standby power, such as Energy Star compliant products. When designing with the TNY277GN, ensure proper transformer design and adequate PCB layout to minimize leakage inductance and EMI. The device's thermal shutdown feature protects against overtemperature conditions, but proper heat sinking through the PCB copper area is recommended for reliable operation at full load.
TNY277GN-TL - 18.5W Offline Flyback Switcher | Power Integrations
The Power Integrations TNY277GN-TL is an offline flyback switcher IC from the TinySwitch-III family, integrating a 700 V power MOSFET, oscillator, high-voltage switched current source, current limit (user selectable), and thermal shutdown circuitry in a compact SMD-8C (7-lead) package. It delivers up to 18.5 W output power from a universal input range of 85-265 VAC, and 23.5 W at 230 VAC, making it ideal for low-power AC-DC power supplies. TinySwitch-III is a family of energy-efficient, low-power offline switchers that use a simple ON/OFF control scheme, eliminating the need for loop compensation. This simplifies design and reduces component count, lowering system cost. The IC operates at a fixed frequency of 132 kHz with frequency jittering to reduce EMI, and includes a user-selectable current limit to optimize efficiency and power delivery. Key features include a 700 V power MOSFET, integrated oscillator, high-voltage switched current source for fast startup, current limit selection, and comprehensive protection features such as over-temperature protection, overvoltage protection, and line undervoltage detection. The EN/UV pin senses line undervoltage through an external resistor, and if absent, disables the line undervoltage function. The device also features leading edge blanking to prevent false triggering. The TNY277GN-TL is designed for high efficiency and low standby power, meeting energy efficiency standards. Its integrated 700 V MOSFET allows direct connection to the rectified AC line, simplifying the primary-side circuit. The SMD-8C package with gull-wing leads is suitable for automated assembly and provides good thermal performance. Typical applications include auxiliary power supplies for appliances, standby power for TVs and monitors, AC-DC adapters, and industrial control power supplies. The wide input voltage range and robust protection make it suitable for global applications. When designing with this device, ensure proper PCB layout with adequate creepage distances for high-voltage isolation, and follow the recommended transformer design in the datasheet to achieve optimal performance and EMI compliance.
TNY277PG - 23.5W Offline Switcher IC | Power Integrations
The Power Integrations TNY277PG is an energy-efficient, off-line switcher IC from the TinySwitch-III family, designed for flyback power supplies up to 23.5 W at 230 VAC or 18 W at 85-265 VAC. It integrates a 700 V power MOSFET, oscillator, high-voltage switched current source, user-selectable current limit, and thermal shutdown circuitry in an 8-pin PDIP-C package (7 leads). The device uses a simple ON/OFF control scheme that eliminates the need for loop compensation, reducing external component count and system cost. An off-line switcher is a power management IC that converts AC mains voltage directly to a regulated DC output, typically using a flyback or buck topology. It combines a high-voltage power switch, control logic, and protection features in a single package, simplifying the design of AC-DC power supplies. The TinySwitch-III family is part of the broader class of switched-mode power supply (SMPS) controllers, which are essential in applications ranging from chargers to industrial power supplies. Key features of the TNY277PG include a 700 V MOSFET for wide input voltage range, a 132 kHz switching frequency for compact magnetics, and selectable current limit for design flexibility. The ON/OFF control scheme provides excellent efficiency across load conditions, and the device includes auto-restart protection for output short-circuit and open-loop faults. The 8-PDIP-C package (7 leads) is through-hole mounted, making it easy to prototype and manufacture. Technically, the TNY277PG integrates the high-voltage power switch and control circuitry on a single die, reducing parasitic inductance and improving reliability. The high-voltage switched current source enables fast startup and low standby power, meeting energy-efficiency standards. The device also features a frequency jittering function to reduce EMI, simplifying filter design. Typical applications include AC-DC adapters, chargers, standby power supplies, and auxiliary power supplies for appliances and industrial equipment. The wide input range and high efficiency make it suitable for global markets. When designing with the TNY277PG, ensure proper heat sinking for the PDIP package at high output power, and follow the recommended PCB layout for the primary-side circuitry to minimize EMI and ensure stable operation.
TNY277PN - 18.5W Flyback Switcher IC | Power Integrations
The Power Integrations TNY277PN is an energy-efficient offline switcher IC from the TinySwitch-III family. It integrates a 700 V power MOSFET, a 132 kHz oscillator, a high-voltage switched current source, user-selectable current limit, and thermal shutdown circuitry into a through-hole 8-PDIP-C package. Under an 85-265 VAC universal input range, the device delivers up to 18.5 W output; at a fixed 230 VAC input it supports up to 23.5 W. These ratings make it suitable for open-frame adapter and auxiliary supply designs that require a simple two-terminal flyback converter stage. An offline switcher is a power-management integrated circuit that accepts rectified AC line voltage and performs high-frequency switching to provide one or more isolated DC outputs through a flyback transformer. The TinySwitch-III family is a subcategory of AC-DC converters, which sit above linear regulators and standard DC-DC converters in the power conversion hierarchy. By integrating the power MOSFET and controller on one chip, offline switcher ICs reduce BOM count, simplify PCB layout, and improve reliability compared to discrete controller-plus-MOSFET implementations. Key features of the TNY277PN include the built-in 700 V power MOSFET, which provides wide margin for line-voltage spikes and improves surge robustness. The integrated high-voltage switched current source accelerates startup and reduces no-load input power. The user-selectable current limit lets designers optimize transformer size for the target power level, while the 132 kHz switching frequency balances transformer size against switching losses. Thermal shutdown protects the IC against secondary-side overload or fault conditions. In operation, the IC uses a simple ON/OFF control scheme that requires no external loop compensation. The internal oscillator controls the power MOSFET duty cycle; when output feedback demands energy, the MOSFET switches, then enters a low-power state. This burst-mode operation at light load reduces standby losses and is especially useful for Energy Star-compliant adapters. The through-hole 8-pin DIP package simplifies assembly and helps transfer heat to PCB copper in moderate-power designs. Typical applications include AC/DC adapters and battery chargers, standby and auxiliary power supplies for appliances, LED drivers, industrial control supplies, and IoT smart-home power modules. The flyback topology pairs with inexpensive transformers and standard optocoupler/TL431 feedback networks. When designing with TNY277PN, pay attention to drain snubber selection, transformer leakage inductance, and BP/M pin decoupling. A well-laid-out PCB with tight loop areas is critical for meeting conducted EMI limits.
TPS82130SILR - 17V 3A Step-Down MicroSiP Module | TI
The Texas Instruments TPS82130SILR is a compact, high-efficiency step-down converter MicroSiP power module that integrates a synchronous buck converter and an inductor into a single 8-pin uSIP (SIL) package. It operates from a 3V to 17V input and delivers up to 3A of continuous output current with an adjustable output voltage from 0.9V to 5V. The module is designed for small solution size, reducing external components and saving PCB area, making it ideal for space-constrained applications. A step-down converter, also known as a buck converter, is a type of DC-DC converter that steps down a higher input voltage to a lower output voltage while maintaining high efficiency. It is a fundamental building block in power management, converting unregulated or higher-voltage rails to the precise voltages required by digital ICs, processors, and other loads. The TPS82130 integrates the switching FETs, inductor, and compensation, simplifying design and improving reliability. Key features include a wide input voltage range of 3V to 17V, output current up to 3A, and an adjustable output from 0.9V to 5V. The module achieves high efficiency, typically above 90% at moderate loads, and includes features such as power-good output, enable pin, and thermal shutdown. The integrated inductor reduces EMI and simplifies layout, while the small uSIP package (8 pins) is suitable for automated assembly. Technically, the TPS82130 uses a fixed-frequency peak-current-mode control architecture, providing fast transient response and stable operation with a small output capacitor. The module operates at a switching frequency of 2.2MHz, allowing the use of small external components. It also features soft-start to limit inrush current and supports 100% duty cycle for low dropout operation. Typical applications include point-of-load (POL) converters for FPGAs, DSPs, and ASICs, as well as power supplies for industrial sensors, IoT devices, and portable equipment. The wide input range makes it suitable for 12V and 5V bus systems, and the high efficiency extends battery life in portable designs. When designing with the TPS82130, ensure adequate input and output capacitance as recommended in the datasheet, and place the module close to the load to minimize parasitic inductance. The thermal pad should be connected to a large copper area for heat dissipation, especially at high output currents.
UC3842BD1 - Current Mode PWM Controller | STMicroelectronics | SMPS
The STMicroelectronics UC3842BD1 is a high-performance current-mode PWM controller designed for off-line and DC-to-DC converter applications. It operates with an input voltage range of 7.5V to 30V and provides a 1A peak output current for driving power MOSFETs. The device is available in an SOIC-8 package, making it suitable for compact power supply designs. A current-mode PWM controller is a type of switching regulator control IC that regulates output voltage by comparing the output error signal with a current-sense signal from the power switch. This architecture provides inherent feed-forward compensation, cycle-by-cycle current limiting, and simplified loop compensation compared to voltage-mode controllers. The UC3842BD1 belongs to the UC3842 family of PWM controllers, which are widely used in AC-DC adapters, battery chargers, and industrial power supplies. Key features of the UC3842BD1 include a trimmed oscillator for precise frequency control, an under-voltage lockout (UVLO) with hysteresis, a 5V reference output, and a high-gain error amplifier. The oscillator frequency is programmable up to 500 kHz, allowing designers to optimize transformer size and efficiency. The device also features a low startup current of 0.5 mA, which is critical for efficient power-up in battery-powered systems. The UC3842BD1 uses a fixed-frequency current-mode architecture with a maximum duty cycle of 96%. The error amplifier has a bandwidth of 1 MHz, enabling fast transient response. The current-sense comparator has a threshold of 1V, providing accurate cycle-by-cycle current limiting. The device is designed to operate over a junction temperature range of -40°C to +150°C, ensuring reliability in harsh environments. Typical applications include switch-mode power supplies (SMPS) for consumer electronics, industrial power converters, and battery chargers. The UC3842BD1 is also used in flyback and boost converter topologies, where its current-mode control simplifies loop compensation and improves line regulation. When designing with the UC3842BD1, ensure that the current-sense resistor is placed close to the IC to minimize parasitic inductance. The oscillator timing resistor and capacitor should be located near the RT/CT pin to reduce noise coupling. Proper grounding and decoupling of the VCC pin are essential for stable operation. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the STMicroelectronics datasheet, providing engineers with a comprehensive resource for selecting and implementing the UC3842BD1.
UC3842BD1013TR - Current Mode PWM Controller | STMicroelectronics
The UC3842BD1013TR is a high-performance current-mode PWM controller from STMicroelectronics, designed for off-line and DC-to-DC converter applications. It operates as a boost or flyback regulator with isolation capability, providing a cost-effective solution for power supply designs. The device is housed in an 8-SOIC package and supports a switching frequency up to 500 kHz, with a peak output current of 1 A. Its input voltage is rated at 15 V, and it operates over a temperature range of 0°C to 70°C. A current-mode PWM controller is a type of switching regulator controller that uses the inductor current as a feedback signal to modulate the duty cycle of the output switch. This architecture provides inherent cycle-by-cycle current limiting, improved transient response, and simplified loop compensation compared to voltage-mode controllers. The UC3842BD1013TR belongs to the UC3842 family, which is widely used in AC-DC adapters, battery chargers, and isolated DC-DC converters. Key features of the UC3842BD1013TR include a trimmed oscillator for precise frequency control, current-mode operation up to 500 kHz, automatic feed-forward compensation, latching PWM for cycle-by-cycle current limiting, and an internally trimmed reference. These features enable stable and reliable operation in demanding power conversion applications. The device also includes under-voltage lockout (UVLO) and a totem-pole output stage capable of sourcing and sinking 1 A peak current to drive power MOSFET gates directly. Technically, the UC3842BD1013TR integrates a 5V reference, an error amplifier, a current-sense comparator, and a PWM latch. The oscillator frequency is set by an external resistor and capacitor, allowing designers to program the switching frequency from 50 kHz to 500 kHz. The current-sense input provides overcurrent protection by comparing the sensed voltage to a 1V threshold. The device's low startup current and low operating current contribute to high efficiency in power supplies. Typical applications include switch-mode power supplies (SMPS) for consumer electronics, industrial power converters, and isolated flyback converters for telecom and networking equipment. The UC3842BD1013TR is particularly suited for designs requiring a simple, reliable current-mode controller with minimal external components. When designing with this controller, ensure proper PCB layout to minimize noise on the current-sense and feedback paths. Use a low-ESR capacitor on the VCC pin and place the timing components close to the IC. Adequate thermal relief on the SOIC package is recommended for high-power applications.
VIPER22ADIP - 12W Offline Switching Regulator | STMicroelectronics
The STMicroelectronics VIPER22ADIP is a monolithic offline switching regulator that integrates a 730V avalanche-rugged Power MOSFET and a PWM controller in a single 8-pin DIP package. It delivers up to 12W of output power in a wide-input AC/DC power supply, making it ideal for low-power applications such as battery chargers, standby power supplies, and auxiliary power rails. The device operates from an input voltage range of 85VAC to 265VAC, with a fixed 60kHz switching frequency and a current-mode control architecture that ensures stable operation and fast transient response. An offline switching regulator, also known as a switched-mode power supply (SMPS) controller, is a device that converts AC mains voltage directly to a regulated DC output without the need for a bulky line-frequency transformer. The VIPER22ADIP belongs to the family of integrated power switches, which combine the power transistor and control circuitry on a single die, reducing component count and simplifying PCB layout. This integration is part of the broader category of power management ICs, which are essential for efficient energy conversion in modern electronic systems. Key features of the VIPER22ADIP include a 730V avalanche-rugged Power MOSFET, a 60kHz fixed switching frequency, and a standby power consumption of less than 0.5W at no load. The device also offers overcurrent, overvoltage, and thermal shutdown protection, ensuring reliable operation in harsh environments. The 8-pin DIP package provides excellent thermal performance, with a junction-to-ambient thermal resistance of 80°C/W, allowing for compact designs without external heatsinks at moderate power levels. The VIPER22ADIP uses a current-mode PWM control architecture with a built-in high-voltage startup circuit, which eliminates the need for an external startup resistor and reduces power loss. The device also features a frequency jittering function that spreads the EMI spectrum, simplifying filter design and helping to meet EMC standards. The integrated Power MOSFET has a low on-resistance of 13Ω, minimizing conduction losses and improving overall efficiency. Typical applications include AC/DC adapters for consumer electronics, standby power supplies for TVs and monitors, auxiliary power supplies for industrial equipment, and battery chargers. The wide input voltage range and robust protection features make it suitable for global markets with varying mains voltages. When designing with the VIPER22ADIP, ensure proper transformer design and snubber circuitry to minimize voltage spikes and EMI. The feedback loop should be carefully compensated to maintain stability across the full load range. The device's thermal shutdown protection requires adequate PCB copper area for heat dissipation, especially at higher output power levels.
VIPER26LDTR - 800V 1.5A Off-Line Converter | STMicroelectronics
The STMicroelectronics VIPER26LDTR is a high-voltage off-line switching regulator that integrates a 800V avalanche-rugged Power MOSFET and a PWM controller in a compact SO-8 package. It delivers up to 1.5A peak current and is designed for low-power AC-DC applications such as auxiliary power supplies, smart meters, and home appliances. The device operates from a wide input voltage range of 85VAC to 265VAC, making it suitable for global applications. An off-line converter is a power supply topology that directly converts the AC mains voltage to a regulated DC output without a line-frequency transformer. The VIPER26LDTR belongs to the family of integrated power switches, which combine the power transistor and control circuitry in a single package, reducing component count and simplifying PCB layout. This integration improves reliability and reduces electromagnetic interference (EMI) compared to discrete solutions. Key features include a fixed 60kHz switching frequency, burst-mode operation for low standby power (<50mW at 265VAC), and built-in protection functions such as overcurrent, overvoltage, and thermal shutdown. The device also features a high-voltage startup circuit that eliminates the need for an external startup resistor, further reducing component count. The SO-8 package with exposed pad provides excellent thermal performance, with a thermal resistance of 60°C/W. The VIPER26LDTR uses a current-mode control architecture with a built-in error amplifier, allowing direct feedback from the output via an optocoupler. The high-voltage startup circuit charges the VDD capacitor quickly, enabling fast startup even under heavy load. The device supports both isolated and non-isolated topologies, including flyback, buck, and buck-boost converters. Typical applications include auxiliary power supplies for appliances, smart meters, industrial control systems, and LED lighting. The wide input range and low standby power make it ideal for always-on applications where energy efficiency is critical. The device is also suitable for IoT devices and smart home hubs that require a compact, efficient power supply. When designing with the VIPER26LDTR, ensure proper transformer design for the target output power and maintain adequate creepage distances for high-voltage isolation. The exposed pad should be soldered to a large copper area for heat dissipation. The feedback loop must be compensated to ensure stability across the full load range.
VIPER35HDTR - 800V Off-Line High Voltage Converter | STMicroelectronics
The STMicroelectronics VIPER35HDTR is a high-voltage off-line switching regulator designed for low-power AC-DC power supplies. It integrates a 800V avalanche-rugged Power MOSFET, a PWM controller, and a high-voltage startup circuit in a compact SO-8 package. The device operates from a wide input voltage range of 85VAC to 265VAC, making it suitable for global applications. It delivers up to 8W of output power in non-isolated buck configurations and up to 5W in isolated flyback topologies, depending on the input voltage and thermal conditions. An off-line switching regulator is a power management IC that converts AC mains voltage directly to a regulated DC output without a bulky line-frequency transformer. It integrates the power switch, control logic, and protection circuits into a single package, enabling compact and efficient power supplies. The VIPER35HDTR belongs to the VIPER35 family of off-line converters, which are part of STMicroelectronics' VIPER series of high-voltage converters. These devices are widely used in smart meters, home appliances, and industrial control systems where low standby power and high reliability are critical. Key features of the VIPER35HDTR include a fixed 60 kHz switching frequency, which balances efficiency and EMI filter size. The device offers a burst-mode operation at light load, reducing standby power consumption to less than 50 mW at 265VAC. It includes comprehensive protection features such as overcurrent protection (OCP), overvoltage protection (OVP), thermal shutdown, and a built-in soft-start to reduce stress during startup. The high-voltage startup circuit eliminates the need for an external startup resistor, simplifying the design and reducing component count. The VIPER35HDTR uses a current-mode control architecture, providing good line and load regulation. The integrated 800V Power MOSFET has a low RDS(on) of 11 ohm, minimizing conduction losses. The device is available in an SO-8 package with a thermal resistance of 100 C/W, allowing adequate heat dissipation for power levels up to 8W with proper PCB copper area. The operating junction temperature range is -40C to +150C, ensuring reliable operation in harsh environments. Typical applications include auxiliary power supplies for smart meters, home appliances such as washing machines and refrigerators, industrial control systems, and LED lighting drivers. The wide input voltage range and high efficiency make it ideal for global power supply designs. The device also supports both buck and flyback topologies, providing design flexibility. When designing with the VIPER35HDTR, ensure proper PCB layout with a sufficient copper area for thermal dissipation. The high-voltage pins must be spaced adequately to prevent arcing. The feedback loop should be compensated to ensure stability across the full load range. The burst-mode operation at light load reduces standby power but may introduce audible noise; use a proper snubber circuit to mitigate this.
VIPER37HDTR - 800V Offline High-Voltage Converter | STMicroelectronics
The STMicroelectronics VIPER37HDTR is an offline high-voltage converter that integrates an 800V avalanche-rugged Power MOSFET and a PWM controller in a compact SO-8 package. It delivers up to 20W of output power in wide-input applications (85-265VAC) and up to 30W in European single-range (230VAC) applications. The device operates at a fixed 60kHz switching frequency, enabling compact transformer design and reduced EMI filtering requirements. An offline high-voltage converter, also known as a switched-mode power supply (SMPS) controller, is a power management IC that converts AC mains voltage directly to a regulated DC output without requiring a separate bulky line-frequency transformer. It integrates the power switch (MOSFET) and control logic into a single package, simplifying the design of AC-DC power supplies. This category sits within the broader hierarchy: offline converter -> AC-DC converter -> power management IC -> semiconductor. The VIPER37HDTR belongs to the VIPER37 family, which is part of ST's VIPER series of offline converters known for high-voltage robustness and low standby power. Key features include an 800V avalanche-rugged power section, a 60kHz fixed switching frequency, and a standby power consumption of less than 50mW at no load. The device offers a complete set of protection features: overvoltage protection (OVP), overcurrent protection (OCP), thermal shutdown, and a built-in soft-start. The SO-8 package provides a compact footprint with a thermal resistance of 85°C/W, making it suitable for space-constrained power supplies. The VIPER37HDTR uses a current-mode control architecture with a high-voltage startup circuit, eliminating the need for an external startup resistor. This reduces component count and improves efficiency. The integrated 800V MOSFET ensures reliable operation in harsh mains environments, and the device is designed to meet energy-efficiency standards such as Energy Star and Blue Angel. Typical applications include auxiliary power supplies for home appliances, smart meters, LED lighting drivers, and industrial control systems. The wide input voltage range and low standby power make it ideal for always-on applications where energy efficiency is critical. When designing with this device, ensure proper transformer design to maintain stable operation across the full load range. The feedback loop must be compensated to avoid instability, and the PCB layout should minimize parasitic inductance in the high-current paths.