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| UPSL1630 Datasheet, PDF (6/7 Pages) Unisonic Technologies – PSR, SINGLE STAGE, AC-DC LED DRIVER WITH ACTIVE | |||
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UPSL1630
Preliminary
CMOS IC
ï® 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 UPSL1630. 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 UPSL1630 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
6 of 7
QW-R502-A010.b
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