UCC2891 Controller Datasheet

UCC2891 Datasheet PDF, Equivalent


Part Number

UCC2891

Description

Active Clamp PWM Controller

Manufacture

etcTI

Total Page 30 Pages
PDF Download
Download UCC2891 Datasheet PDF


UCC2891
UCC2891, UCC2892
UCC2893, UCC2894
ą
SLUS542F − OCTOBER 2003 − REVISED JULY 2009
CURRENTĆMODE
ACTIVE CLAMP PWM CONTROLLER
FEATURES
DESCRIPTION
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
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.
D 110-V Input Startup Regulator on UCC2891/3
D TrueDrivet 2-A Sink, 2-A Source Outputs
The UCC2891/3 includes a 110-V start-up
regulator for initial start-up and to provide
D Accurate Line UV and Line OV Threshold
keep-alive power during stand-by.
D Programmable Slope Compensation
Additional features include an internal
D 1.0-MHz Synchronizable Oscillator
D Precise Programmable Maximum Duty Cycle
D Programmable Soft Start
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
APPLICATIONS
D 150-W to 700-W SMPS
D High-Efficiency, Low EMI/RFI Off-Line or
DC/DC Converters
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.
D Server, 48-V Telecom, Datacom
D High Power Adapter, LCD-TV and PDP-TV
RDEL
R ON
ROFF
C VREF
UCC2891
1 RDEL
VIN 16
2 RTON LINE UV 15
3 RTOFF VDD 14
4 VREF
OUT 13
5 SYNC
AUX 12
BIAS
WINDING
+VIN
C BULK
C BIAS
ROUT
C CLAMP
Q1
D1
C AUX
Q2 D2
Q4
D3
Q3
SR
DRIVE
Lo
D4 Co
LOAD
6 GND
PGND 11
C F 7 CS
SS/SD 10
8 RSLOPE
RSLOPE
FB 9
C SS
D AUX
RF
R CS
SECONDARY
SIDE E/A
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.
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.
www.ti.com
Copyright 2003 − 2009, Texas Instruments Incorporated
1

UCC2891
UCC2891, UCC2892
UCC2893, UCC2894
ą
SLUS542F − OCTOBER 2003 − REVISED JULY 2009
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.
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range unless otherwise noted(1)
UNIT
Line input voltage, VIN
Supply voltage, VDD
Analog inputs
(IDD < 10 mA)
FB, CS, SYNC, LINEOV, LINEUV
120
16.5
−0.3 to (VREF + 0.3)
not to exceed 6
V
V
V
Output source current (peak), IO_SOURCE
Output sink current (peak), IO_SINK
Operating junction temperature range, TJ
Storage temperature, Tstg
ESD rating
OUT, AUX
Human body model, (HBM)
Change device model (CDM)
2.5
−2.5
−55 to 150
−65 to 150
2000
500
A
°C
V
Lead temperature, Tsol, 1,6 mm (1/16 inch) from case for 10 seconds
300 °C
(1) Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only,
and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is
not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. All voltages are with respect to
GND. Currents are positive into and negative out of, the specified terminal.
RECOMMENDED OPERATING CONDITIONS
Line input voltage, VIN
Supply voltage, VDD
Supply bypass capacitance
Timing resistance, RON = ROFF (for 250-kHz
operation)
Operating junction temperature, TJ
Reference bypass capacitance, CREF
MIN
18
8.5
1
NOM
12.0
75
−40
0.1
MAX
110
16.0
UNIT
V
V
µF
k
105 °C
1 µF
ORDERING INFORMATION
PART NUMBERS
CS
TA
APPLICATION
AUX
OUTPUT
POLARITY
THRESHOLD
(INCLUDES
SLOPE COM-
110-V START-UP
CIRCUIT
SOIC−16
(D)
TSSOP−16
(PW)
PENSATION)
−40°C to 125°C
DC−DC
DC-DC/Sec. Side
DC−DC
Off−Line
P-Channel
N-Channel
0.75 V
1.27 V
0.75 V
1.27 V
Yes
UCC2891D
UCC2891PW
No
UCC2892D
UCC2892PW
Yes
UCC2893D
UCC2893PW
No
UCC2894D
UCC2894PW
The D and PW packages are available taped and reeled. Add R suffix to device type (e.g. UCC2891DR) to order quantities of 2,500
devices per reel (for the D package) and 2,000 devices per reel (for the PW package). Bulk quantities are 40 units per tube (for the D
package) and 90 units per tube (for the PW package).
2 www.ti.com


Features UCC2891, UCC2892 UCC2893, UCC2894 ą SL US542F − OCTOBER 2003 − REVISED JUL Y 2009 CURRENTĆMODE ACTIVE CLAMP PWM C ONTROLLER FEATURES DESCRIPTION D Low Output Jitter D Soft−Stop Shutdown o f MAIN and AUX D Ideal for Active Clamp /Reset Forward, Flyback Converters D Pr ovides Complementary Auxiliary Driver w ith Programmable Deadtime (Turn-On Dela y) between AUX and MAIN Switches D Peak Current-Mode Control with Cycle-by-Cyc le Current Limiting The UCC2891/2/3/4 family of PWM controllers is designed t o simplify implementation of the variou s active clamp/reset switching power to pologies. The UCC289x is a peak current -mode, fixedfrequency, 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. D 110-V Input Startup Regulator on UCC2891/3 D TrueDrivet 2-A Sink, 2-A Source Output s The UCC2891/3 includes a 110-V start-up regulator for initial start-.
Keywords UCC2891, datasheet, pdf, etcTI, Active, Clamp, PWM, Controller, CC2891, C2891, 2891, UCC289, UCC28, UCC2, Equivalent, stock, pinout, distributor, price, schematic, inventory, databook, Electronic, Components, Parameters, parts, cross reference, chip, Semiconductor, circuit, Electric, manual, substitute




@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)