UCC2894 Series
16V active clamp current mode PWM controller with N-channel clamp FET and line OV protection
Manufacturer: Texas Instruments
Catalog(5 parts)
| Part | Internal Switch(s)▲▼ | Topology | Fault Protection | Control Features | Duty Cycle▲▼ | Supplier Device Package | Frequency - Switching▲▼ | Output Isolation | Mounting Type | Voltage - Start Up▲▼ | Package / Case | Package / Case▲▼ | Operating Temperature▲▼ | Operating Temperature▲▼ | Voltage - Supply (Vcc/Vdd)▲▼ | Voltage - Supply (Vcc/Vdd)▲▼ | Package / Case▲▼ | Package / Case▲▼ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Flyback, Forward | Current Limiting | Soft Start, Sync | 0.699999988079071 ul | 16-SOIC | 1000000 Hz | Isolated | Surface Mount | 12.699999809265137 V | 16-SOIC | 0.003911599982529879 m, 3.900000095367432 ul | -40 °C | 105 °C | 16 V | 8.5 V | ||||
Flyback, Forward | Current Limiting | Soft Start, Sync | 0.699999988079071 ul | 16-SOIC | 1000000 Hz | Isolated | Surface Mount | 12.699999809265137 V | 16-SOIC | 0.003911599982529879 m, 3.900000095367432 ul | -40 °C | 105 °C | 16 V | 8.5 V | ||||
Flyback, Forward | Current Limiting | Soft Start, Sync | 0.699999988079071 ul | 16-SOIC | 1000000 Hz | Isolated | Surface Mount | 12.699999809265137 V | 16-SOIC | 0.003911599982529879 m, 3.900000095367432 ul | -40 °C | 105 °C | 16 V | 8.5 V | ||||
Flyback, Forward | Current Limiting | Soft Start, Sync | 0.699999988079071 ul | 16-TSSOP | 1000000 Hz | Isolated | Surface Mount | 12.699999809265137 V | 16-TSSOP | -40 °C | 105 °C | 16 V | 8.5 V | 0.004394200164824724 m | 0.004399999976158142 m | |||
Flyback, Forward | Current Limiting | Soft Start, Sync | 0.699999988079071 ul | 16-TSSOP | 1000000 Hz | Isolated | Surface Mount | 12.699999809265137 V | 16-TSSOP | -40 °C | 105 °C | 16 V | 8.5 V | 0.004394200164824724 m | 0.004399999976158142 m |
Key Features
• Low Output JitterSoft-Stop Shutdown of MAIN and AUXIdeal for Active Clamp/Reset Forward, Flyback ConvertersProvides Complementary Auxiliary Driver with Programmable Deadtime (Turn-On Delay) between AUX and MAIN SwitchesPeak Current-Mode Control with Cycle-by-Cycle Current Limiting110-V Input Startup Regulator on UCC2891/3TrueDrive™ 2-A Sink, 2-A Source OutputsAccurate Line UV and Line OV ThresholdProgrammable Slope Compensation1.0-MHz Synchronizable OscillatorPrecise Programmable Maximum Duty CycleProgrammable Soft StartAPPLICATIONS150-W to 700-W SMPSHigh-Efficiency, Low EMI/RFI Off-Line or DC/DC ConvertersServer, 48-V Telecom, DatacomHigh Power Adapter, LCD-TV and PDP-TVLow Output JitterSoft-Stop Shutdown of MAIN and AUXIdeal for Active Clamp/Reset Forward, Flyback ConvertersProvides Complementary Auxiliary Driver with Programmable Deadtime (Turn-On Delay) between AUX and MAIN SwitchesPeak Current-Mode Control with Cycle-by-Cycle Current Limiting110-V Input Startup Regulator on UCC2891/3TrueDrive™ 2-A Sink, 2-A Source OutputsAccurate Line UV and Line OV ThresholdProgrammable Slope Compensation1.0-MHz Synchronizable OscillatorPrecise Programmable Maximum Duty CycleProgrammable Soft StartAPPLICATIONS150-W to 700-W SMPSHigh-Efficiency, Low EMI/RFI Off-Line or DC/DC ConvertersServer, 48-V Telecom, DatacomHigh Power Adapter, LCD-TV and PDP-TV
Description
AI
The UCC2891/2/3/4 family of PWM controllers is designed to simplify implementation of the various active clamp/reset switching power topologies.
The UCC289x is a peak current-mode, fixedfrequency, high-performance pulse width modulator. It includes the logic and the drive capability for the auxiliary switch with a simple method of programming the critical delays for proper active clamp operation.
The UCC2891/3 includes a 110-V start-up regulator for initial start-up and to provide keep-alive power during stand-by.
Additional features include an internal programmable slope compensation circuit, precise DMAXlimit, and a single resistor programmable synchronizable oscillator. An accurate line monitoring function also programs the converter\x92s ON and OFF transitions with regard to the bulk input voltage. Along with the UCC2897, this UCC289x family allows the power supply designer to eliminate many of the external components, reducing the size and complexity of the design.
The UCC2891/2/3/4 family of PWM controllers is designed to simplify implementation of the various active clamp/reset switching power topologies.
The UCC289x is a peak current-mode, fixedfrequency, high-performance pulse width modulator. It includes the logic and the drive capability for the auxiliary switch with a simple method of programming the critical delays for proper active clamp operation.
The UCC2891/3 includes a 110-V start-up regulator for initial start-up and to provide keep-alive power during stand-by.
Additional features include an internal programmable slope compensation circuit, precise DMAXlimit, and a single resistor programmable synchronizable oscillator. An accurate line monitoring function also programs the converter\x92s ON and OFF transitions with regard to the bulk input voltage. Along with the UCC2897, this UCC289x family allows the power supply designer to eliminate many of the external components, reducing the size and complexity of the design.