UCC2897A (正在供货)

高级电流模式有源钳位 PWM 控制器

高级电流模式有源钳位 PWM 控制器 - UCC2897A
数据表
 

描述

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

  • 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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参数 与其它产品相比 PWM 与谐振控制器

 
Topology
Control Method
Vin (Min) (V)
Vin (Max) (V)
Frequency (Max) (kHz)
UVLO Thresholds On/Off (V)
Duty Cycle (Max) (%)
Gate Drive (Typ) (A)
Features
Rating
Operating Temperature Range (C)
Pin/Package
UCC2897A
Active-Clamp Forward
Forward   
Current   
18   
110   
1000   
12.7/~8   
74   
2   
HV Start-up
Input Line Monitor
Programmable Slope Compensation
Soft Start
Soft Switching   
Catalog   
-40 to 125   
20QFN
20TSSOP