UCC28730-Q1 - Zero-Power Standby PSR Flyback Controller | TI
MPN: UCC28730-Q1 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.56 | $25.60 |
| 100 | $2.28 | $228.00 |
| 500 | $2.05 | $1,025.00 |
| 1,000 | $1.82 | $1,820.00 |
Drop-in alternatives for UCC28730-Q1 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:
UCC28730
β Drop-Inπ Reference alternative (not in catalog)
UCC28700-Q1
β Drop-Inπ Reference alternative (not in catalog)
UCC28700
β Drop-Inπ Reference alternative (not in catalog)
NCP1246
β‘ Same Packageπ Reference alternative (not in catalog)
NCP1247
β‘ Same Packageπ Reference alternative (not in catalog)
UCC28730-Q1 Maximum Ratings & Electrical Characteristics
| Topology | Flyback |
| Regulation Type | Primary-Side Regulation (PSR) |
| Switching Frequency | 32 Hz to 83 kHz |
| Minimum Switching Frequency | 30 Hz |
| No-Load Power | < 5 mW |
| Input Voltage Range | 40 V to 1000 V DC |
| Startup Current Source | 700 V |
| Output Regulation | Constant Voltage (CV) and Constant Current (CC) |
| Optocoupler | Not Required |
| Package | 7-SOIC (D) |
| Operating Temperature Range | -40Β°C to +150Β°C (junction) |
| Automotive Qualification | AEC-Q100 |
| Wake-Up Signal Detection | Yes |
| Frequency Dithering | Yes |
| Protection Features | Overvoltage, Overcurrent, Overtemperature |
UCC28730-Q1 Pin Configuration
| Pin 1 | VDD β Power supply input |
| Pin 2 | GND β Ground |
| Pin 3 | DRV β Gate drive output |
| Pin 4 | CS β Current sense input |
| Pin 5 | FB β Feedback input |
| Pin 6 | WAKE β Wake-up signal input |
| Pin 7 | HV β High-voltage startup |
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
UCC28730-Q1 is suitable for 6 applications: Automotive Traction Inverter Bias Supply, On-Board Charger (OBC) Auxiliary Supply, Industrial Power Supply, Battery Management System (BMS) Isolated Supply, Motor Control Unit (MCU) Bias Supply, Solar Inverter Auxiliary Supply.
Automotive Traction Inverter Bias Supply
The UCC28730-Q1 is ideal for providing bias power to traction inverters in electric vehicles. Its wide input range of 40 V to 1000 V DC accommodates the varying DC bus voltage, while the AEC-Q100 qualification ensures reliability in harsh automotive environments. The ultra-low standby power of less than 5 mW minimizes battery drain when the vehicle is off. The PSR architecture eliminates the optocoupler, reducing component count and improving long-term reliability. With a switching frequency up to 83 kHz, the transformer size can be minimized, saving PCB space. The wake-up detection feature enables fast transient response to load steps, ensuring stable operation during inverter switching.
Recommended
On-Board Charger (OBC) Auxiliary Supply
In on-board chargers for electric vehicles, the UCC28730-Q1 provides an isolated auxiliary supply for control electronics and communication interfaces. Its primary-side regulation eliminates the optocoupler, which is beneficial in high-voltage environments where isolation is critical. The wide input range supports the varying DC bus voltage during charging, and the low standby power helps meet efficiency standards. The 7-SOIC package is compact, fitting into space-constrained OBC designs. The frequency dithering feature reduces EMI, which is important for passing automotive EMC requirements. The AEC-Q100 qualification ensures operation over the full automotive temperature range.
Recommended
Industrial Power Supply
The UCC28730-Q1 is well-suited for industrial power supplies requiring isolated DC-DC conversion with low standby power. Its input range of 40 V to 1000 V DC covers a wide variety of industrial bus voltages, from 48 V telecom to 800 V solar inverters. The PSR architecture reduces component count, improving reliability and reducing cost. The minimum switching frequency of 30 Hz enables less than 5 mW no-load power, which is critical for always-on industrial equipment. The device's protection features, including overvoltage and overcurrent, ensure robust operation in harsh environments. The 7-SOIC package is easy to integrate into existing designs.
Recommended
Battery Management System (BMS) Isolated Supply
In battery management systems, the UCC28730-Q1 provides isolated power for cell monitoring and communication circuits. Its low standby power is essential for minimizing battery drain during storage. The wide input range accommodates the varying battery stack voltage, from 40 V to 1000 V. The PSR architecture eliminates the optocoupler, which is beneficial in high-voltage BMS designs where isolation is critical. The wake-up detection feature allows the BMS to respond quickly to load changes, such as when the main contactor closes. The AEC-Q100 qualification ensures reliable operation in automotive and industrial BMS applications.
Recommended
Motor Control Unit (MCU) Bias Supply
The UCC28730-Q1 is used to provide bias power to motor control units in electric vehicles and industrial drives. Its wide input range supports the DC bus voltage variations during motor operation. The low standby power reduces energy consumption when the motor is idle. The PSR architecture simplifies the design by eliminating the optocoupler, which is important in high-voltage environments. The frequency dithering reduces EMI, helping to meet EMC standards. The AEC-Q100 qualification ensures reliable operation in automotive motor control applications. The compact 7-SOIC package fits into space-constrained MCU designs.
Recommended
Solar Inverter Auxiliary Supply
In solar inverters, the UCC28730-Q1 provides an isolated auxiliary supply for control and monitoring circuits. Its input range of 40 V to 1000 V DC covers the wide voltage variations from solar panels. The low standby power is important for maximizing energy harvest during low-light conditions. The PSR architecture eliminates the optocoupler, improving reliability in outdoor environments. The device's protection features, such as overvoltage and overcurrent, protect against grid transients. The 7-SOIC package is suitable for compact inverter designs. The frequency dithering helps meet EMI regulations for grid-connected equipment.
Recommended
Recommended Products Summary
Engineering reference data for UCC28730-Q1 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | UCC28730 | UCC28700-Q1 | NCP1246 |
|---|---|---|---|---|
| Package | 7-SOIC (D) | 7-SOIC (D) | 7-SOIC (D) | SOIC-7 |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | onsemi |
| Input Voltage Range | 40 V to 1000 V | 40 V to 1000 V | 40 V to 1000 V | [DATA_NEEDED] |
| Switching Frequency | 32 Hz to 83 kHz | 32 Hz to 83 kHz | 32 Hz to 83 kHz | [DATA_NEEDED] |
| No-Load Power | < 5 mW | < 5 mW | < 5 mW | [DATA_NEEDED] |
| Optocoupler Required | No | No | No | No |
| Automotive Qualification | AEC-Q100 | No | AEC-Q100 | No |
| Wake-Up Detection | Yes | Yes | No | [DATA_NEEDED] |
Key Differentiators
- Automotive qualification (AEC-Q100) (vs UCC28730)
- Wake-up signal detection (vs UCC28700-Q1)
- Ultra-low standby power (vs NCP1246)
Design Notes
Place the UCC28730-Q1 close to the transformer to minimize parasitic inductance and EMI. Keep the high-voltage startup pin (HV) traces short and away from sensitive feedback traces. Use a solid ground plane under the IC to reduce noise. Ensure adequate creepage and clearance for high-voltage isolation per IPC standards.
The UCC28730-Q1 has a junction temperature range of -40Β°C to +150Β°C. In high-power applications, ensure adequate PCB copper area for heat dissipation. The 7-SOIC package has a thermal resistance of approximately 150Β°C/W (theta_JA). For continuous operation at high input voltages, consider adding thermal vias to the ground plane.
Ensure the auxiliary winding is accurately coupled to the secondary to maintain output regulation. Incorrect transformer design can lead to poor CV/CC accuracy. Also, place the startup resistor and snubber components close to the IC to minimize parasitic inductance. Avoid exceeding the absolute maximum ratings on the HV pin.
Compliance Information
AEC-Q100 qualified per TI product page. RoHS and REACH compliant per TI datasheet.
