UPSD1630L-S08-R datasheet(5/6 Pages) UTC

5 / 6 page

UPSD1630

Preliminary

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

5 of 6

www.unisonic.com.tw

QW-R502-A01.a



APPLICATION INFORMATION (Cont.)

Short-circuit Protection

The short-circuit protection is triggered if the DSEN pin voltage is detected below 0.2V for a continuous time of

640μs. The gate drive switching will be turned off, and a restart process will be kicked off when the VDD voltage

drops below the UVLO threshold.

This re-start process will repeat if the short-circuit condition continues to exist.

Current Sensing and Leading Edge Blanking

Cycle-by-cycle current limiting is offered in UTC UPSD1630. 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 500ns leading-edge

blanking is built in to avoid false-termination of the switching pulse so that the external RC filtering is no longer

needed.

Other Protection Control

Good power supply system reliability is achieved with its comprehensive protection features including VDD over

voltage protection, OTP, over current protection (OCP), output over voltage protection, output short circuit protection

(SCP), leading edge blanking, VDD under voltage lockout, etc.

VDD is supplied by transformer auxiliary winding output. The output of UTC UPSD1630 is shutdown when VDD

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

UPSD1630L-S08-R 데이터시트(PDF) 5 Page - Unisonic Technologies