UCC2961 Datasheet, PDF (1/17 Pages) Texas Instruments – ADVANVED PRIMARY-SIDE STARTUP CONTROLLER

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UCC2961, UCC3961
ADVANCED PRIMARYĆSIDE STARTUP CONTROLLER
D Operates with Secondary–Side PWM
Control
D Isolated PWM Command through a Pulse
Transformer
D Initial Free-Running Soft-Startup with
Duty-Cycle Clamping
D Up to 400-kHz Synchronizable Switching
Frequency
D High-Current FET Drive (1.5-A Sink, 0.75-A
Source)
SLUS431A – MAY 2000 – REVISED DECEMBER 2000
D Multi-Mode Overcurrent Protection with
Restart, Latching, or Cycle-by-Cycle
Current Limiting
D Programmable Volt-Second Clamp for
Transformer Reset
D Undervoltage Lockout with 2-V Hysteresis
D Low-Current Startup with Optional
Disconnect
D Programmable Overvoltage and
Undervoltage Protection
D 8–pin Version Also Available (UCC3960)
typical application diagram
VIN
VOLT
SEC
CLAMP
UCC3961
14 UVS START 13
UV/OV
STOP
1
OVS
VDD 12
8 VS
REF 6
OPTIONAL
DEPLETION
MODE
SWITCH
+
–
OUT ¹¹
4
FEED
BACK
3
SOFT START
5
FREQ
SET
7
CS 9
FB
SS
RT
SD 2
AGND PGND 10
FAULT LATCH DELAY
CSD
UDG–99039
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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.
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