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UCC2897PW Datasheet(PDF) 1 Page - Texas Instruments

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Part # UCC2897PW
Description  ADVANCED CURRENT MODE ACTIVE CLAMP PWM CONTROLLER
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

UCC2897PW Datasheet(HTML) 1 Page - Texas Instruments

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UCC2897
SLUS591A − NOVEMBER 2003 − REVISED MARCH 2004
ADVANCED CURRENT MODE
ACTIVE CLAMP PWM CONTROLLER
1
www.ti.com
FEATURES
D Ideal for Active Clamp/Reset Forward,
Flyback and Synchronous Rectifier Apps
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 Hiccup Mode 0.75-V Current Limit
D TrueDrivet 2-A Sink, 2-A Source Outputs
D 110-V Input Startup Device
D 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
D Precise Programmable Maximum Duty Cycle
D PB-Free Lead Finish Package
APPLICATIONS
D High-Efficiency DC/DC Power Supplies
D Server Power, 48-V Telecom, Datacom, and
42-V Automotive Applications
DESCRIPTION
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) package.
TYPICAL APPLICATION DIAGRAM
CBULK
RCS
CCLAMP
RF
7
15
14
1
18
3
4
5
RDEL
RTON
RTOFF
SYNC
LINEUV
OUT
AUX
PGND
6
VREF
13
LINEOV
UCC2897
8
GND
9CS
10
RSLOPE
17
VDD
FB
11
SECONDARY
SIDE E/A
Q1
Q2
LOAD
SR
DRIVE
BIAS
WINDING
+VIN
19
16
VIN
PVDD
SS/SD
12
UDG−03186
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.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright
 2004, Texas Instruments Incorporated


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