Product Description
The 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 - 450 V supply.
A PWM dimming input is provided that accepts an external control TTL-compatible signal.
The output current can be programmed by an internal 270 mV reference, or controlled externally through a 0 - 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.
• Fast average current control• Programmable constant off-time switching• PWM/linear dimming input• Output short circuit protection with skip mode• Ambient operating temperature -40 - +125°C• Pin-compatible with the HV9910B and HV9961 Technical data:• Input voltage: 8 - 450 V• Dimming: PWM• Power: 1000 mW
