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UCC2897A

更新时间： 2024-11-04 05:54:27
品牌 Logo 应用领域
德州仪器 - TI 控制器
页数 文件大小 规格书
40页 961K
描述
ADVANCED CURRENT-MODE ACTIVE CLAMP PWM CONTROLLER

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UCC2897A 数据手册

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SLUS829B − AUGUST 2008 − REVISED DECEMBER 2008  
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FEATURES  
DESCRIPTION  
D
D
D
D
Low Output Jitter  
The UCC2897A PWM controller simplifies  
“Soft Stop” shut down of MAIN and AUX  
110-V Input Startup Function  
implementation of the various active clamp/reset  
and synchronous rectifier switching power  
topologies.  
Ideal for Active Clamp/Reset Forward,  
Flyback and Synchronous Rectifier Uses  
The UCC2897A 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.  
D
Provides Complementary Auxiliary Driver  
with Programmable Deadtime (Turn-On  
Delay) between AUX and MAIN Switches  
D
Peak Current-Mode Control with 0.5-V  
Cycle-by-Cycle Current Limiting  
D
D
D
Hiccup Mode 0.75-V Current Limit  
Features include an internal programmable slope  
compensation circuit, precise D  
limit, and a  
TrueDrivet 2-A Sink, 2-A Source Outputs  
MAX  
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,  
VIN.  
Trimmed Internal Bandgap Reference for  
Accurate Line UV and Line OV Threshold  
D
Programmable Slope Compensation  
D
High-Performance 1.0-MHz Synchronizable  
Oscillator with Internal Timing Capacitor  
The UCC2897A adds a second level hiccup mode  
D
D
Precise Programmable Maximum Duty Cycle  
PB-Free Lead Finish Package  
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) package.  
APPLICATIONS  
D
High-Efficiency DC/DC Power Supplies  
D
Server Power, 48-V Telecom, Datacom, and  
42-V Automotive Applications  
TYPICAL APPLICATION DIAGRAM  
BIAS  
WINDING  
UCC2897A  
R
+VIN  
DEL  
VIN  
1
3
RDEL  
Q4  
L
O
D3  
LINEOV  
LINEUV  
R
19  
18  
ON  
D4  
LOAD  
C
4
5
6
7
8
9
RON  
O
R
OFF  
ROFF  
VREF  
VDD 17  
Q3  
C
BIAS  
PVDD 16  
R
SR  
C
OUT  
VREF  
Q1  
Q2  
SYNC  
GND  
CS  
D1  
DRIVE  
15  
OUT  
C
AUX  
D
C
AUX  
F
14  
AUX  
R
SLOPE  
10 RSLOPE PGND 13  
12 SS/SD FB 11  
SECONDARY  
SIDE E/A  
C
SS  
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam  
during storage or handling to prevent electrostatic damage to the MOS gates.  
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Copyright 2008, Texas Instruments Incorporated  
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www.ti.com  
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