UCSR3651S datasheet(8/9 Pages) UTC

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UCSR3651S Datasheet(PDF) 8 Page - Unisonic Technologies

Part #	UCSR3651S

Description	HIGH PRECISION CC/CV PRIMARY-SIDE PWM POWER SWITCH

Download	9 Pages

Scroll/Zoom	100%

Manufacturer	UTC [Unisonic Technologies]

Direct Link	http://www.utc-ic.com

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8 / 9 page

UCSR3651S

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

8 of 9

www.unisonic.com.tw

QW-R129-010.A



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.

Manufacturer	Part #	Datasheet	Description
Unisonic Technologies	UCSR3651S	247Kb / 9P	HIGH PRECISION CC/CV PRIMARY-SIDE PWM POWER SWITCH
	UCSR3651SG-D07A-T	247Kb / 9P	HIGH PRECISION CC/CV PRIMARY-SIDE PWM POWER SWITCH
	UCSR3651SG-S08-R	247Kb / 9P	HIGH PRECISION CC/CV PRIMARY-SIDE PWM POWER SWITCH
	UCSR3651SL-D07A-T	247Kb / 9P	HIGH PRECISION CC/CV PRIMARY-SIDE PWM POWER SWITCH
	UCSR3651S	247Kb / 9P	HIGH PRECISION CC/CV PRIMARY-SIDE PWM POWER SWITCH

Manufacturer	Part #	Datasheet	Description
Unisonic Technologies	USR3651S	219Kb / 9P	HIGH PRECISION CC/CV PRIMARY-SIDE PWM POWER SWITCH
	UCSR3654S	223Kb / 9P	HIGH PRECISION CC/CV PRIMARY-SIDE PWM POWER SWITCH
	UPSR100	211Kb / 7P	HIGH PRECISION CC/CV PRIMARY-SIDE PWM POWER SWITCH
	US3651	205Kb / 8P	HIGH PRECISION CC/CV PRIMARY-SIDE PWM POWER SWITCH
	UCS3654	226Kb / 9P	HIGH PRECISION CC/CV PRIMARY-SIDE PWM POWER SWITCH
	UCSR3651S	247Kb / 9P	HIGH PRECISION CC/CV PRIMARY-SIDE PWM POWER SWITCH
	USR3651S	261Kb / 9P	HIGH PRECISION CC/CV PRIMARY-SIDE PWM POWER SWITCH
	USR3651	242Kb / 8P	HIGH PRECISION CC/CV PRIMARY-SIDE PWM POWER SWITCH
	USRB02	224Kb / 7P	HIGH PRECISION CC/CV PRIMARY-SIDE PWM POWER SWITCH
	UCS3654	217Kb / 9P	HIGH PRECISION CC/CV PRIMARY-SIDE PWM POWER SWITCH

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