HV9861A Datasheet, PDF (1/15 Pages) Supertex, Inc – LED Driver with Average-Mode, Constant Current Control

HV9861A
LED Driver with Average-Mode Constant Current Control
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
Applications
• DC/DC or AC/DC LED driver applications
• LED back-light driver for LCD displays
• General purpose constant current source
• LED signage and displays
• Architectural and decorative LED lighting
• LED street lighting
Description
HV9861A is a patented, average-mode, constant-cur-
rent 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, which therefore
greatly improves the accuracy, line and load regulation
of the LED current without any need for loop compen-
sation 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 (V_DD) for the HV9861A is 7.5V.
The IC can be powered from a 15 - 450V supply. A
PWM dimming input is provided that accepts an exter-
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 1