UCSR3651SG-S08-R datasheet(8/9 Pages) UTC

Il numero della parte	UCSR3651SG-S08-R

Spiegazioni elettronici	HIGH PRECISION CC/CV PRIMARY-SIDE PWM POWER SWITCH

PDF	9 Pages

Scroll/Zoom	100%

Produttore elettronici	UTC [Unisonic Technologies]

Homepage	http://www.utc-ic.com

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8 / 9 page

UCSR3651S

Preliminary

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

8 of 9

www.unisonic.com.tw

QW-R129-010.d



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.

UCSR3651SG-S08-R Scheda tecnica(PDF) 8 Page - Unisonic Technologies