HV9861ALG-G

HV9861A LED Driver with Average-Mode Constant Current Control Features Description Fast average current control HV9861A is a patented, average-mode, constant-cur- Programmable constant off-time switching rent control, LED driver IC operating in a constant off- PWM / linear dimming input time mode. Unlike the HV9910B, this control IC does not produce a peak-to-average error, which therefore Output short circuit protection with skip mode greatly improves the accuracy, line and load regulation Ambient operating temperature -40C to +125C of the LED current without any need for loop compen- Pin-compatible with the HV9910B and HV9961 sation or high-side current sensing. The output LED current accuracy is 3%. Applications The IC is equipped with a current limit comparator for DC/DC or AC/DC LED driver applications hiccup-mode output short circuit protection. Internal LED back-light driver for LCD displays over-temperature protection is provided. The internally General purpose constant current source regulated voltage (V ) for the HV9861A is 7.5V. DD LED signage and displays The IC can be powered from a 15 - 450V supply. A Architectural and decorative LED lighting PWM dimming input is provided that accepts an exter- LED street lighting nal 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. HV9861A is pin-to-pin compatible with the HV9910B and HV9961, and can be used as a drop-in replace- ment for many applications to improve the LED current accuracy and regulation. 2014 Microchip Technology Inc. DS20005333A-page 1HV9861A Package Types VIN 1 16 NC NC 15 2 NC NC 3 14 RT CS 4 13 LD 1 8 RT VIN GND 12 5 VDD 2 7 LD CS NC 6 11 NC 3 6 VDD GND NC 7 10 NC 4 5 PWMD GATE 8 9 PWMD GATE 8-Lead SOIC 16-Lead SOIC See Table 2-1 for pin information Typical Application Circuit 15VDC to 450VDC LED Load VIN PWMD GATE HV9861A VDD CS R T Sets LD RT R LED CS GND Current DS20005333A-page 2 2014 Microchip Technology Inc.