|Package | PIN:||PW | 20|
|Temp:||Q (-40 to 125)|
- Low-Output Jitter
- Soft-Stop Shutdown of MAIN and AUX
- 110-V Input Startup Function
- Ideal for Active-Clamp, Reset-Forward, Flyback and Synchronous Rectifier Uses
- Provides Complementary Auxiliary Driver with Programmable Dead Time (Turn-On Delay) between AUX and MAIN Switches
- Peak Current-Mode Control with 0.5-V Cycle-by-Cycle Current Limiting
- TrueDrive™ 2-A Sink, 2-A Source Outputs
- Trimmed Internal-Bandgap Reference for Accurate Line UV and Line OV Threshold
- Programmable Slope Compensation
- High-Performance 1-MHz Synchronizable Oscillator with Internal Timing Capacitor
- Precise Programmable Maximum Duty Cycle
- PB-Free Lead Finish Package
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Texas Instruments UCC2897APW
The UCC2897A PWM controller simplifies implementation of the various active clamp orreset and synchronous rectifier switching power topologies.
The UCC2897A is a peak current-mode fixed-frequency high-performance pulse-widthmodulator. The controller includes the logic and the drive capability for the P-channel auxiliaryswitch along with a simple method of programming the critical delays for proper active-clampoperation.
Features include an internal programmable slope compensation circuit, preciseDMAX limit, and a synchronizable oscillator with an internal-timingcapacitor. An accurate line-monitoring function also programs the ON and OFF transitions of theconverter with regard to the bulk input voltage, VIN.
The UCC2897A adds a second-level hiccup-mode current-sense threshold, bi-directionalsynchronization and input-overvoltage protection functionalities. The UCC2897A is offered in 20-pinTSSOP (PW) and 20-pin QFN (RGP) packages.