UCC2897A中文资料具有 P 沟道钳位 FET 和线路过压保护的 110V 有源钳位电流模式 PWM 控制器数据手册TI规格书

描述 Description

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.

特性 Features

• 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