UCC2897PW ,Current Mode Active Clamp PWM ControllerELECTRICAL CHARACTERISTICS (1)V = 12 V , 1-µF capacitor from VDD to GND, 0.01-µF capacitor from VRE ..
UCC2897PWG4 ,Current Mode Active Clamp PWM Controller 20-TSSOP -40 to 105maximum ratings” may cause permanent damage to the device. These are stress ratings only,and functi ..
UCC2897PWR ,Current Mode Active Clamp PWM ControllerELECTRICAL CHARACTERISTICS (1)V = 12 V , 1-µF capacitor from VDD to GND, 0.01-µF capacitor from VRE ..
UCC2897PWRG4 ,Current Mode Active Clamp PWM Controller 20-TSSOP -40 to 105FEATURES DESCRIPTION Ideal for Active Clamp/Reset Forward,The UCC2897 PWM controller simplifiesFly ..
UCC2897RTJR ,Current Mode Active Clamp PWM Controller 20-QFN -40 to 105MAXIMUM RATINGS(1)over operating free-air temperature range unless otherwise notedUNITLine input vo ..
UCC28C40D ,BiCMOS Low-Power Current Mode PWM ControllerMaximum Ratings(1)(2)over operating free-air temperature range (unless otherwise noted)MIN MAX UNIT ..
UPA1793 ,SWITCHING N- AND P-CHANNEL POWER MOS FETDATA SHEETMOS FIELD EFFECT TRANSISTORµµµµ PA1793SWITCHINGN- AND P-CHANNEL POWER MOS FETPACKAGE ..
UPA1793G ,SWITCHING N- AND P-CHANNEL POWER MOS FETFEATURESP-Channel 3 ; Source 24 ; Gate 2• Low on-state resistance5, 6; Drain 2N-Channel RDS(on)1 ..
UPA1802 ,N-CHANNEL MOS FIELD EFFECT TRANSISTOR FOR SWITCHINGFEATURES +5°3°–3°• Can be driven by a 2.5-V power source 0.50.1±0.05+0.150.6• Low on-state resistan ..
UPA1803 ,N-CHANNEL MOS FIELD EFFECT TRANSISTOR FOR SWITCHINGFEATURES0.1±0.05+0.150.6–0.1• Can be driven by a 4.5-V power source14• Low on-state resistanceRDS(o ..
UPA1803GR-9JG-E1 ,Nch enhancement type MOS FETFEATURES 0.50.1±0.05+0.150.6–0.1• Can be driven by a 4.5-V power source14• Low on-state resistanceR ..
UPA1803GR-9JG-E2 ,Nch enhancement type MOS FETELECTRICAL CHARACTERISTICS (TA = 25°C)CHARACTERISTICS SYMBOL TEST CONDITIONS MIN. TYP. MAX. UNITZer ..
UCC2897-UCC2897PW-UCC2897PWG4-UCC2897PWR-UCC2897PWRG4-UCC2897RTJR
Current Mode Active Clamp PWM Controller
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SLUS591G − NOVEMBER 2003 − REVISED DECEMBER 2008
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FEATURES Ideal for Active Clamp/Reset Forward,
Flyback and Synchronous Rectifier Apps Provides Complementary Auxiliary Driver
with Programmable Deadtime (Turn-On
Delay) between AUX and MAIN Switches Peak Current-Mode Control with 0.5-V
Cycle-by-Cycle Current Limiting Hiccup Mode 0.75-V Current Limit TrueDrive� 2-A Sink, 2-A Source Outputs 110-V Input Startup Device Trimmed Internal Bandgap Reference for
Accurate Line UV and Line OV Threshold Programmable Slope Compensation High-Performance 1.0-MHz Synchronizable
Oscillator with Internal Timing Capacitor Precise Programmable Maximum Duty Cycle PB-Free Lead Finish Package
APPLICATIONS High-Efficiency DC/DC Power Supplies Server Power, 48-V Telecom, Datacom, and
42-V Automotive Applications
DESCRIPTIONThe 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 D MAX 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) and 20-pin QFN (RTJ)
package.
TYPICAL APPLICATION DIAGRAM
BIAS +VINUDG−03186
