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 DMAX limit, 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.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | UCC289x Current Mode Active Clamp PWM Controller datasheet (Rev. F) | 01 Jul 2009 | |
| Application note | Understanding and Designing an Active Clamp Current Mode Controlled Converter (Rev. A) | 27 Jan 2020 | ||
| Selection guide | Power Management Guide 2018 (Rev. R) | 25 Jun 2018 | ||
| Application note | Method of Providing Hiccup Operation for UCC2897AEVM | 27 Aug 2009 | ||
| Application note | UCC2891 Active Clamp | 22 Dec 2003 | ||
| More literature | Seminar 1000 Topic 3 - Active Clamp and Reset Technique | 15 Feb 2001 | ||
| More literature | Seminar 1100 Topic 3 - Design Considerations for Active Clamp and Reset | 15 Feb 2001 |
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| Package | Pins | Download |
|---|---|---|
| SOIC (D) | 16 | View options |
| TSSOP (PW) | 16 | View options |
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