USL250X

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

6 of 8

www.unisonic.com.tw

QW-R103-155.B



OUTPOUT DESCRIPTION (Cont.)

Current Sensing and Leading Edge Blanking

Cycle-by-Cycle current limiting is offered in USL250X. The switch current is detected by a sense resistor into the

CS pin. An internal leading edge blanking circuit chops off the sensed voltage spike at initial power MOSFET on

state so that the external RC filtering on sense input is no longer needed.

Protection

USL250X

offers comprehensive protection coverage with auto-recovery features including LED string short circuit

protection.

USL250X

detects the states of LED. When LED string short circuit occurs, the switching frequency is reduced to

condition is removed.

Over temperature protection is offered in USL250X. When temperature rises above 150°C (typical), switching will

be stopped. The normal operation is resumed until the temperature falls below 100°C (typical).