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HV9861A LED Driver IC

Microchip presents a patented, average-mode, constant current control LED driver IC operating in a constant off-time mode

Image of Microchip's HV9861A LED Drive ICThe Microchip HV9861A is a patented, average-mode, constant-current control LED driver IC operating in a constant off-time mode. Unlike the HV9910B, this control IC does not produce a peak-to-average error, and therefore greatly improves the accuracy, line, and load regulation of the LED current without any need for loop compensation or high-side current sensing. The output LED current accuracy is ±3%. The IC is 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 7.5 V. The IC can be powered from a 15 V to 450 V supply. A PWM dimming input that accepts an external control TTL-compatible signal is provided. The output current can be programmed by an internal 270 mV reference, or controlled externally through a 0 V to 1.5 V dimming input. The IC is 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.

Features  
  • Fast average current-control
  • Programmable constant off-time switching
  • PWM / linear dimming input
  • Output short circuit protection with skip mode
  • Ambient operating temperature -40°C to +125°C
  • Pin-compatible with the HV9910B and HV9961

HV9861A

ImageManufacturer Part NumberDescriptionAvailable Quantity
IC LED DRVR LIN DIM 165MA 8SOICHV9861ALG-GIC LED DRVR LIN DIM 165MA 8SOIC3661 - ImmediateView Details
IC LED DRVR LIN DIM 165MA 16SOICHV9861ANG-GIC LED DRVR LIN DIM 165MA 16SOIC1363 - ImmediateView Details
Published: 2015-01-27