The Supertex HV9961 LED driver IC with constant current control greatly improves accuracy and line and load regulation of the LED current without any need for loop compensation or high-side current sensing. The Supertex HV9961 LED driver provides output LED current accuracy of ±3% and comes equipped with a current limit comparator for hiccup-mode output short circuit protection. The Supertex HV9961 can be powered from an 8.0 to 450V supply and provides a PWM dimming input that accepts an external control TTL compatible signal. This LED driver IC with constant current control can be used as a drop-in replacement for many applications to improve the LED current accuracy and regulation.