UCSR3652SG-S08-R datasheet(8/10 Pages) UTC

8 / 10 page

UCSR3652S

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

8 of 10

www.unisonic.com.tw

QW-R129-017.C



OPERATION DESCRIPTION (Cont.)

Current Sensing and Leading Edge Blanking

Cycle-by-cycle current limiting is offered in UTC UCSR3652S. 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 UCSR3652S is shutdown when VDD

drops below VTH(OFF) and the power converter enters power on start-up sequence thereafter.

UCSR3652SG-S08-R データシート(PDF) 8 Page - Unisonic Technologies