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-SLUS430A – APRIL 1999 – REVISED DECEMBER 2000 Operates With Secondary-Side PWM
Control
Receives Isolated PWM Command Through
a Pulse-Edge-Transformer
Initial Free-Running Soft-Start Up with
Duty-Cycle Clamping
Up to 400-kHz Synchronizable Switching
Frequency
High-Current FET Drive (1.5-A Sink, 0.75-A
Source)
Overcurrent Protection
Undervoltage Lockout with 2-V Hysteresis
Low-Current Startup typical operating circuit VIN X UCC3960
2 FB 1 SS VDD 8 REF 4 OUT 7 CS 5 GND 6 FEED
BACK SOFT
START 3 RT UDG–99010 FREQ …
