Supertex HV9861A Average-Mode Constant Current Control LED Drivers are patented LED driver ICs operating in a constant off-time mode. These control ICs do not produce a peak-to-average error, and therefore greatly improve the accuracy, line, and load regulation of the LED current without any need for loop compensation or highside current sensing. The output LED current accuracy is ±3%. Supertex HV9861A Average-Mode Constant Current Control LED Drivers are each equipped with a current limit comparator for hiccup-mode output short circuit protection. Internal over-temperature protection is provided. The internally regulated voltage (VDD) for the HV9861A is 7.5V.
Supertex HV9861A Average-Mode Constant Current Control LED Drivers can be powered from a 12 - 450V supply. A PWM dimming input is provided that accepts an external control TTL-compatible signal. The output current can be programmed by an internal 270mV reference, or controlled externally through a 0 - 1.5V dimming input. These ICs are pin-to-pin compatible with the Supertex HV9910B and HV9961, and can be used as a drop-in replacement for many applications to improve the LED current accuracy and regulation.