Ideal for Active Clamp/Reset Forward, Flyback and Synchronous Rectifier Apps
Provides Complementary Auxiliary Driver with Programmable Deadtime (Turn-On Delay) between AUX and MAIN Switches
Peak Current-Mode Control with 0.5-V Cycle-by-Cycle Current Limiting
Hiccup Mode 0.75-V Current Limit
TrueDrive™ 2-A Sink, 2-A Source Outputs
110-V Input Startup Device
Trimmed Internal Bandgap Reference for Accurate Line UV and Line OV Threshold
Programmable Slope Compensation
High-Performance 1.0-MHz Synchronizable Oscillator with Internal Timing Capacitor
Precise Programmable Maximum Duty Cycle
PB-Free Lead Finish Package
APPLICATIONS
- High-Efficiency DC/DC Power Supplies
- Server Power, 48-V Telecom, Datacom, and 42-V Automotive Applications

Ideal for Active Clamp/Reset Forward, Flyback and Synchronous Rectifier Apps
Provides Complementary Auxiliary Driver with Programmable Deadtime (Turn-On Delay) between AUX and MAIN Switches
Peak Current-Mode Control with 0.5-V Cycle-by-Cycle Current Limiting
Hiccup Mode 0.75-V Current Limit
TrueDrive™ 2-A Sink, 2-A Source Outputs
110-V Input Startup Device
Trimmed Internal Bandgap Reference for Accurate Line UV and Line OV Threshold
Programmable Slope Compensation
High-Performance 1.0-MHz Synchronizable Oscillator with Internal Timing Capacitor
Precise Programmable Maximum Duty Cycle
PB-Free Lead Finish Package
APPLICATIONS
- High-Efficiency DC/DC Power Supplies
- Server Power, 48-V Telecom, Datacom, and 42-V Automotive Applications

The UCC2897 PWM controller simplifies implementation of the various active clamp/reset and synchronous rectifier switching power topologies.

Based on the UCC2891 active-clamp controller the UCC2897 is a peak current-mode, fixed-frequency, high-performance pulse width modulator. It 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 D_MAX limit, and a synchronizable oscillator with an internal timing capacitor. An accurate line monitoring function also programs the converter's ON and OFF transitions with regard to the bulk input voltage.

The UCC2897 adds a second level hiccup mode current sense threshold, bi-directional synchronization and the input overvoltage protection functionalities that are not available on the 16-pin UCC2891. The UCC2897 is offered in 20-pin TSSOP (PW) and 20-pin QFN (RTJ) package.

The UCC2897 PWM controller simplifies implementation of the various active clamp/reset and synchronous rectifier switching power topologies.

Based on the UCC2891 active-clamp controller the UCC2897 is a peak current-mode, fixed-frequency, high-performance pulse width modulator. It 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 D_MAX limit, and a synchronizable oscillator with an internal timing capacitor. An accurate line monitoring function also programs the converter's ON and OFF transitions with regard to the bulk input voltage.

The UCC2897 adds a second level hiccup mode current sense threshold, bi-directional synchronization and the input overvoltage protection functionalities that are not available on the 16-pin UCC2891. The UCC2897 is offered in 20-pin TSSOP (PW) and 20-pin QFN (RTJ) package.

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	类型	标题		下载最新的英语版本		日期
*	数据表	Advanced Current-Mode Active Clamp PWM Controller 数据表 (Rev. G)				2008年 12月 17日

UCC2897

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