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电流模式有源钳位 PWM 控制器

UCC2897 处于停产状态
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UCC2897A 正在供货 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 This product is a replacement device for 0 to 70 degrees C. Designs can achieve better performance.

产品详情

Switching frequency (max) (kHz) 1000 UVLO thresholds on/off (V) 13/8 Operating temperature range (°C) -40 to 105 Rating Catalog
Switching frequency (max) (kHz) 1000 UVLO thresholds on/off (V) 13/8 Operating temperature range (°C) -40 to 105 Rating Catalog
TSSOP (PW) 20 41.6 mm² 6.5 x 6.4
  • 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 DMAX 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 DMAX 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
更多文献资料 Исходные проекты ll 2011年 5月 13日
用户指南 Reference Design PR265A (Rev. A) 2004年 4月 1日
应用手册 UCC2891 Active Clamp 2003年 12月 22日
更多文献资料 Seminar 1000 Topic 3 - Active Clamp and Reset Technique 2001年 2月 15日
更多文献资料 Seminar 1100 Topic 3 - Design Considerations for Active Clamp and Reset 2001年 2月 15日

设计和开发

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参考设计

PMP8923 — 非标准 (>25.5W) PoE - 高效正向转换器 (5V@10A) 参考设计

此转换器提供 5V/10A 的高功率 PoE 输出。TPS2379 PD 控制器允许使用外部热插拔 FET 以提高效率。UCC2897A PWM 控制器用于实施高效的有源钳位正向转换器。
测试报告: PDF
原理图: PDF
封装 引脚 下载
TSSOP (PW) 20 查看选项

订购和质量

包含信息:
  • RoHS
  • REACH
  • 器件标识
  • 引脚镀层/焊球材料
  • MSL 等级/回流焊峰值温度
  • MTBF/时基故障估算
  • 材料成分
  • 鉴定摘要
  • 持续可靠性监测
包含信息:
  • 制造厂地点
  • 封装厂地点

支持和培训

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