UCC2897
- 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.
기술 자료
| 유형 | 직함 | 날짜 | ||
|---|---|---|---|---|
| * | Data sheet | Advanced Current-Mode Active Clamp PWM Controller datasheet (Rev. G) | 2008/12/17 | |
| More literature | Исходные проекты ll | 2011/05/13 | ||
| User guide | Reference Design PR265A (Rev. A) | 2004/04/01 | ||
| Application note | UCC2891 Active Clamp | 2003/12/22 | ||
| More literature | Seminar 1000 Topic 3 - Active Clamp and Reset Technique | 2001/02/15 | ||
| More literature | Seminar 1100 Topic 3 - Design Considerations for Active Clamp and Reset | 2001/02/15 |
설계 및 개발
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PMP8923 — 비표준 PoE(>25.5W) - 고효율 순방향 컨버터(5V@10A) 레퍼런스 디자인
| 패키지 | 핀 | CAD 기호, 풋프린트 및 3D 모델 |
|---|---|---|
| TSSOP (PW) | 20 | Ultra Librarian |
주문 및 품질
- RoHS
- REACH
- 디바이스 마킹
- 납 마감/볼 재질
- MSL 등급/피크 리플로우
- MTBF/FIT 예측
- 물질 성분
- 인증 요약
- 지속적인 신뢰성 모니터링
- 팹 위치
- 조립 위치