UCC28C42DR - 20V Low-Power Current-Mode PWM Controller | TI
MPN: UCC28C42DR β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.29 | $0.29 |
| 10 | $0.25 | $2.50 |
| 100 | $0.2 | $20.00 |
| 500 | $0.17 | $85.00 |
| 1,000 | $0.15 | $150.00 |
Drop-in alternatives for UCC28C42DR β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
UCC28C42D
β Drop-Inπ Reference alternative (not in catalog)
UCC28C43DR
β Drop-Inπ Reference alternative (not in catalog)
UCC28C44DR
β Drop-Inπ Reference alternative (not in catalog)
UCC28C45DR
β Drop-Inπ Reference alternative (not in catalog)
UC3842ADR
β Drop-Inπ Reference alternative (not in catalog)
UC3843ADR
β Drop-Inπ Reference alternative (not in catalog)
UCC28C42DR Maximum Ratings & Electrical Characteristics
| Supply Voltage (VCC) | 20V (max) |
| Startup Voltage (UVLO ON) | 14.5V |
| Minimum Operating Voltage (UVLO OFF) | 9V |
| UVLO Hysteresis | 8V |
| Maximum Output Current | 1A (peak) |
| Maximum Switching Frequency | 1000 kHz |
| Reference Output Voltage | 5V (Β±2%) |
| Duty Cycle | 0% to 100% |
| Topology | Boost, Flyback, Forward Converter |
| Package | 8-SOIC (D) |
| Operating Temperature Range | -40Β°C to +105Β°C |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Technology | BiCMOS |
| Pin Count | 8 |
UCC28C42DR Pin Configuration
| Pin 1 | COMP β Error amplifier output for loop compensation |
| Pin 2 | VFB β Voltage feedback input |
| Pin 3 | ISENSE β Current sense input |
| Pin 4 | RT/CT β Oscillator timing resistor/capacitor |
| Pin 5 | GND β Ground |
| Pin 6 | OUT β Gate drive output |
| Pin 7 | VCC β Supply voltage |
| Pin 8 | VREF β 5V reference output |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
UCC28C42DR is suitable for 6 applications: Industrial Power Supplies, Telecom Equipment, Auxiliary Power Rails, Battery-Powered Devices, LED Lighting Drivers, Server Power Supplies.
Industrial Power Supplies
The UCC28C42DR is ideal for industrial power supplies requiring robust current-mode control. Its 20V supply rating and 1A peak output current can drive MOSFETs in boost and flyback converters. The 100% duty cycle capability ensures operation even under low input voltage conditions, while the BiCMOS technology reduces power consumption, improving overall efficiency in 24V industrial bus systems.
Recommended
Telecom Equipment
In telecom equipment, the UCC28C42DR provides reliable power conversion for -48V to +5V or +3.3V rails. Its high switching frequency up to 1 MHz allows for smaller magnetic components, reducing board space. The current-mode control offers excellent line and load regulation, essential for maintaining stable voltages in communication systems. The low quiescent current helps meet energy efficiency standards.
Recommended
Auxiliary Power Rails
The UCC28C42DR is well-suited for auxiliary power rails in systems that require a small, efficient power supply. Its low startup voltage of 14.5V and wide operating range allow it to be powered from a variety of sources. The 5V reference with 2% accuracy provides a stable bias for other ICs. The device's small 8-SOIC package and minimal external components make it ideal for space-constrained designs.
Recommended
Battery-Powered Devices
For battery-powered devices, the UCC28C42DR's low power consumption is a key advantage. The BiCMOS technology reduces quiescent current, extending battery life. The device can operate from a 9V minimum supply, making it suitable for multi-cell battery packs. Its current-mode control ensures stable operation as the battery voltage declines, and the 100% duty cycle capability allows maximum utilization of the battery's energy.
Recommended
LED Lighting Drivers
The UCC28C42DR can be used in LED lighting drivers that require constant current regulation. Its current-mode control provides accurate current sensing and overcurrent protection. The high switching frequency allows for small inductors, reducing the size of the driver. The device's wide input voltage range and 100% duty cycle capability make it suitable for both AC-DC and DC-DC LED drivers.
Recommended
Server Power Supplies
In server power supplies, the UCC28C42DR is used in the auxiliary and standby power stages. Its high efficiency and low power consumption help meet 80 PLUS requirements. The device's robust current-mode control ensures stable operation under dynamic loads. The 1A peak output current is sufficient to drive the gate of power MOSFETs in flyback converters used for standby power.
Recommended
Recommended Products Summary
Engineering reference data for UCC28C42DR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | UCC28C42D | UCC28C43DR | UCC28C44DR | UCC28C45DR | UC3842ADR | UC3843ADR |
|---|---|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Startup Voltage (UVLO ON) | 14.5V | 14.5V | 8.4V | 14.5V | 8.4V | 16V | 8.4V |
| Minimum Operating Voltage (UVLO OFF) | 9V | 9V | 7.6V | 9V | 7.6V | 10V | 7.6V |
| Maximum Duty Cycle | 100% | 100% | 100% | 50% | 50% | 100% | 100% |
| Maximum Switching Frequency | 1000 kHz | 1000 kHz | 1000 kHz | 1000 kHz | 1000 kHz | 500 kHz | 500 kHz |
| Reference Voltage | 5V Β±2% | 5V Β±2% | 5V Β±2% | 5V Β±2% | 5V Β±2% | 5V Β±2% | 5V Β±2% |
| Technology | BiCMOS | BiCMOS | BiCMOS | BiCMOS | BiCMOS | Bipolar | Bipolar |
Key Differentiators
- BiCMOS technology for lower power consumption (vs UC3842ADR)
- Higher maximum switching frequency (vs UC3842ADR)
- 100% duty cycle capability (vs UCC28C44DR)
Design Notes
Place the RT/CT timing components as close to pin 4 as possible to minimize parasitic capacitance and noise. Use a 0.1uF ceramic bypass capacitor near the VCC pin (pin 7) to filter high-frequency noise. Keep the current-sense trace from pin 3 to the sense resistor short and direct to avoid false triggering.
The UCC28C42DR can operate with a supply voltage up to 20V. Ensure the VCC pin is adequately decoupled with a 10uF electrolytic capacitor in parallel with a 0.1uF ceramic capacitor. The startup current is low, but the total supply current increases with switching frequency, so size the VCC supply accordingly.
Although the UCC28C42DR is a low-power device, the output driver can dissipate significant power when driving large gate capacitances at high frequencies. Ensure adequate copper area on the PCB around the SOIC package to dissipate heat. For high-frequency operation above 500 kHz, consider using a gate driver IC to reduce the load on the controller.
Compliance Information
RoHS compliant per TI product page. Not AEC-Q100 qualified. Halogen-free status not specified in available data.
