UCC2897A 高级电流模式有源钳位 PWM 控制器 | 德州仪器 TI.com.cn

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


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.


  • 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控制器和谐振控制器

Control Method
VCC (Min) (V)
VCC (Max) (V)
Frequency (Max) (kHz)
UVLO Thresholds On/Off (V)
Duty Cycle (Max) (%)
Gate Drive (Typ) (A)
Operating Temperature Range (C)
UCC2897A LM5026 LM5034
Active-Clamp Forward
Active-Clamp Forward
Active-Clamp Forward
Current     Current     Current    
8.5     8     8    
16     15     15    
1000     1000     2000    
12.7/~8     Programmable/1.25V     Programmable/1.25V    
74     80     76    
2     3     2.5    
HV Start-up
Input Line Monitor
Programmable Slope Compensation
Soft Start
Soft Switching
Supports PFET Clamp    
Current Limiting
Dead Time Control
HV Start-up
Leading Edge Blanking
Programmable Max Duty Cycle
Programmable Soft Start
Supports NFET Clamp
Supports PFET Clamp
Synchronization Pin    
Current Limiting
HV Start-up
Soft Start
Supports PFET Clamp
Synchronization Pin    
Catalog     Catalog     Catalog    
-40 to 125     -40 to 125     -40 to 125    


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WEBENCH® Designer UCC2897A

  最小   最大 范围
输入电压  V 18.0 to 110.0V
输出电压  V 3.3 to 50V
输出电流  A ≤ 100A
环境温度  °C -40 to 125°C

覆盖面积 BOM成本 效率

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