JW®1237, integrated with 150V NMOSFET,is used to drive a LED string, and remove the 100/120Hz LED current ripple on AC/DC power by a capacitor between VC and GND.
The adaptive technology ensures minimum power dissipation on JW1237 while removing LED current ripple.
JW1237 clamps the input voltage on VIN pin to 31V. Only one resistor is needed when the output voltage of AC/DC power is higher than 31V.
JW1237 allows user to setup maximum LED current by the sensing resistor between VS pin and GND, which protects JW1237 from being damaged when LED short connected or hot-plug.
By sensing the voltage of LED-pin via a resistor between LED- pin and VLMT pin, JW1237 allows users to setup the maximum cathode voltage of LED string, which could help limit the power dissipation on chip.
It is considered that LED is shorted when the cathode voltage of LED is higher than short connecting threshold and remains over 180us.JW1237 shuts down when LED is shorted and recovers after 12ms.