WS3231 Datasheet, PDF (6/7 Pages) Shenzhen Winsemi Microelectronics Co., Ltd – WS3231 High PF PSR Constant Current LED Driver

WS3231
UVLO,OVP and Clamp, over temperature protection, and
so on.
When the LED is open circuit, it will trigger over-voltage
protection logic and latch, the system stops switching
immediately; When the LED short circuit is detected, the
system works at low frequency(Fop=5Khz), so the power
loss is low. At some catastrophic fault condition, such as
shorted CS resistor or flyback transformer saturation, the
internal fast fault detection circuit will trigger and latch, the
system stops switching immediately.
After the system enters into fault latch condition, the VCC
voltage will fall until it reaches UVLO threshold. Then the
system will re-start again. If the fault condition is removed,
the system will recover to normal operation.The thermal
shutdown circuitry in the WS3231 senses the die
temperature after start up, and the thermal protection
threshold is set to 150℃ with a 25℃ hysteresis. When the
temperature on die of WS3231 rises and reaches the
threshold, the power MOSFET will be shut down
immediately and maintained switch off until the
temperature on die falls 25℃ from thermal protection
trigger point.
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