UCC2891DRG4 ,Current Mode Active Clamp PWM Controller 16-SOIC -40 to 85ELECTRICAL CHARACTERISTICS (1)V = 12 V , 1-µF capacitor from VDD to GND, 0.01-µF capacitor from VRE ..
UCC2891PW ,Current Mode Active Clamp PWM ControllerMAXIMUM RATINGS(1)over operating free-air temperature range unless otherwise notedUNITLine input vo ..
UCC2891PW ,Current Mode Active Clamp PWM ControllerFEATURES DESCRIPTION Low Output JitterThe UCC2891/2/3/4 family of PWM controllers is Soft−Stop Sh ..
UCC2891PWG4 ,Current Mode Active Clamp PWM Controller 16-TSSOP -40 to 85features include an internalprogrammable slope compensation circuit, 1.0-MHz Synchronizable Oscill ..
UCC2891PWR ,Current Mode Active Clamp PWM Controller SLUS542F − OCTOBER 2003 − REVISED JULY 2009THERMAL RESISTANCE INFO ..
UCC2892 ,UCC289x Current Mode Active Clamp PWM ControllerELECTRICAL CHARACTERISTICS (1)V = 12 V , 1-µF capacitor from VDD to GND, 0.01-µF capacitor from VRE ..
UPA1755 ,SWITCHING N-CHANNEL POWER MOS FET INDUSTRIAL USEFEATURES3 ; Source 24 ; Gate 2• Dual chip type5, 6; Drain 2• Low on-resistance6.0 ±0.314RDS(on)1 ..
UPA1755G-E1 ,Nch enhancement type power MOS FET(Dual type)FEATURES3 ; Source 24 ; Gate 2• Dual chip type5, 6; Drain 2• Low on-resistance6.0 ±0.314RDS(on)1 ..
UPA1755G-E2 ,Nch enhancement type power MOS FET(Dual type)ELECTRICAL CHARACTERISTICS (TA = 25 °C, All terminals are connected.)CHARACTERISTICS SYMBOL TEST CO ..
UPA1756 ,SWITCHING N-CHANNEL POWER MOS FET INDUSTRIAL USEELECTRICAL CHARACTERISTICS (TA = 25 °C)CHARACTERISTICS SYMBOL TEST CONDITIONS MIN. TYP. MAX. UNITDr ..
UPA1756G ,SWITCHING N-CHANNEL POWER MOS FET INDUSTRIAL USEFEATURES4 ; Gate 2• Dual MOS FET chips in small package5, 6; Drain 2• 2.5-V gate drive type and l ..
UPA1757 ,SWITCHING N-CHANNEL POWER MOS FET INDUSTRIAL USEFeatures• Dual MOS FET chips in small package3 ; Source 24 ; Gate 2• 2.5 V gate drive type and lo ..
UCC2891D-UCC2891DG4-UCC2891DRG4-UCC2891PW-UCC2891PWG4-UCC2891PWR
Current Mode Active Clamp PWM Controller
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FEATURES Low Output Jitter Soft−Stop Shutdown of MAIN and AUX Ideal for Active Clamp/Reset Forward,
Flyback Converters Provides Complementary Auxiliary Driver
with Programmable Deadtime (Turn-On
Delay) between AUX and MAIN Switches Peak Current-Mode Control with
Cycle-by-Cycle Current Limiting 110-V Input Startup Regulator on UCC2891/3 TrueDrive� 2-A Sink, 2-A Source Outputs Accurate Line UV and Line OV Threshold Programmable Slope Compensation 1.0-MHz Synchronizable Oscillator Precise Programmable Maximum Duty Cycle Programmable Soft Start
APPLICATIONS 150-W to 700-W SMPS High-Efficiency, Low EMI/RFI Off-Line or
DC/DC Converters Server, 48-V Telecom, Datacom High Power Adapter, LCD-TV and PDP-TV
DESCRIPTIONThe 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.
BIASDELPlease 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.
