The UCC2897A PWM controller simplifies implementation of the various active clamp or reset and synchronous rectifier switching power topologies.
The UCC2897A is a peak current-mode fixed-frequency high-performance pulse-width modulator. The controller includes the logic and the drive capability for the P-channel auxiliary switch along with a simple method of programming the critical delays for proper active-clamp operation.
Features include an internal programmable slope compensation circuit, precise DMAX limit, and a synchronizable oscillator with an internal-timing capacitor. An accurate line-monitoring function also programs the ON and OFF transitions of the converter with regard to the bulk input voltage, VIN.
The UCC2897A adds a second-level hiccup-mode current-sense threshold, bi-directional synchronization and input-overvoltage protection functionalities. The UCC2897A is offered in 20-pin TSSOP (PW) and 20-pin QFN (RGP) packages.
All trademarks are the property of their respective owners.
|Vin (Min) (V)|
|Vin (Max) (V)|
|Frequency (Max) (kHz)|
|UVLO Thresholds On/Off (V)|
|Duty Cycle (Max) (%)|
|Gate Drive (Typ) (A)|
|Operating Temperature Range (C)|
| Active-Clamp Forward |
| HV Start-up |
Input Line Monitor
Programmable Slope Compensation
|-40 to 125|
| 20QFN |