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UCC2892PWR Datasheet(PDF) 1 Page - Texas Instruments

Part # UCC2892PWR
Description  CURRENT-MODE ACTIVE CLAMP PWM CONTROLLER
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

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UCC2891, UCC2892
UCC2893, UCC2894
SLUS542F − OCTOBER 2003 − REVISED JULY 2009
CURRENT MODE
ACTIVE CLAMP PWM CONTROLLER
1
www.ti.com
FEATURES
D Low Output Jitter
D Soft−Stop Shutdown of MAIN and AUX
D Ideal for Active Clamp/Reset Forward,
Flyback Converters
D Provides Complementary Auxiliary Driver
with Programmable Deadtime (Turn-On
Delay) between AUX and MAIN Switches
D Peak Current-Mode Control with
Cycle-by-Cycle Current Limiting
D 110-V Input Startup Regulator on UCC2891/3
D TrueDrivet 2-A Sink, 2-A Source Outputs
D Accurate Line UV and Line OV Threshold
D Programmable Slope Compensation
D 1.0-MHz Synchronizable Oscillator
D Precise Programmable Maximum Duty Cycle
D Programmable Soft Start
APPLICATIONS
D 150-W to 700-W SMPS
D High-Efficiency, Low EMI/RFI Off-Line or
DC/DC Converters
D Server, 48-V Telecom, Datacom
D High Power Adapter, LCD-TV and PDP-TV
DESCRIPTION
The UCC2891/2/3/4 family of PWM controllers is
designed to simplify implementation of the various
active clamp/reset switching power topologies.
The UCC289x is a peak current-mode, fixed-
frequency, high-performance pulse width modulator.
It includes the logic and the drive capability for the
auxiliary
switch
with
a
simple
method
of
programming the critical delays for proper active
clamp operation.
The UCC2891/3 includes a 110-V start-up
regulator for initial start-up and to provide
keep-alive power during stand-by.
Additional
features
include
an
internal
programmable
slope
compensation
circuit,
precise DMAX limit, and a single resistor
programmable
synchronizable
oscillator.
An
accurate line monitoring function also programs
the converter’s ON and OFF transitions with
regard to the bulk input voltage. Along with the
UCC2897, this UCC289x family allows the power
supply designer to eliminate many of the external
components, reducing the size and complexity of
the design.
5
13
12
16
15
1
2
3
RDEL
RTON
RTOFF
SYNC
LINE UV
OUT
AUX
PGND
4
VREF
11
VIN
UCC2891
6
GND
7CS
8
RSLOPE
14
VDD
SS/SD
10
FB
9
SECONDARY
SIDE E/A
Q1
Q2
LOAD
SR
DRIVE
BIAS
WINDING
+VIN
D3
Q3
D4
Q4
Lo
Co
D2
D1
RDEL
R
ON
ROFF
RSLOPE
RF
C F
C
VREF
C BIAS
C SS
C AUX
C CLAMP
C BULK
R
OUT
R CS
D
AUX
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
 2003 − 2009, Texas Instruments Incorporated
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.


Similar Part No. - UCC2892PWR

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UCC2892PW TI-UCC2892PW Datasheet
577Kb / 34P
[Old version datasheet]   CURRENT MODE ACTIVE CLAMP PWM CONTROLLER
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