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| UCSR3651S Datasheet, PDF (8/9 Pages) Unisonic Technologies – HIGH PRECISION CC/CV PRIMARY-SIDE PWM POWER SWITCH | |||
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UCSR3651S
CMOS IC
ï® OPERATION DESCRIPTION (Cont.)
Current Sensing and Leading Edge Blanking
Cycle-by-cycle current limiting is offered in UTC UCSR3651S. The switch current is detected by a sense resistor
into the CS pin. When the power switch is turned on, a turn-on spike will occur on this resistor. A 900ns leading-edge
blanking is built in to avoid false-termination of the switching pulse so that the external RC filtering is no longer
needed.
Protection Control
Good power supply system reliability is achieved with its comprehensive protection features including VDD
over-voltage protection, VDD Clamp, GATE Clamp, Power on soft start, Cycle-by-cycle current limiting, short circuit
protection, leading edge blanking, OTP and UVLO, etc.
VDD is supplied by transformer auxiliary winding output. The output of UTC UCSR3651S is shutdown when VDD
drops below VTH(OFF) and the power converter enters power on start-up sequence thereafter.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
8 of 9
QW-R129-010.A
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