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| HV9961LG-G Datasheet, PDF (1/9 Pages) Supertex, Inc – LED Driver with Average-Mode Constant Current Control | |||
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Supertex inc.
HV9961
LED Driver with Average-Mode
Constant Current Control
Features
âºâº Fast average current control
âºâº Programmable constant off-time switching
âºâº Linear dimming input
âºâº PWM dimming input
âºâº Output short circuit protection with skip mode
âºâº Ambient operating temperature -40OC to +125OC
âºâº Pin-compatible with the HV9910B
Applications
âºâº DC/DC or AC/DC LED driver applications
âºâº LED backlight driver for LCD displays
âºâº General purpose constant current source
âºâº LED signage and displays
âºâº Architectural and decorative LED lighting
âºâº LED street lighting
General Description
The HV9961 is an average current mode control LED driver
IC operating in a constant off-time mode. Unlike HV9910B,
this control IC does not produce a peak-to-average error, and
therefore greatly improves 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.
The HV9961 can be powered from an 8.0 - 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 275mV reference, or controlled
externally through a 0 - 1.5V dimming input.
HV9961 is pin-to-pin compatible with HV9910B and it can
be used as a drop-in replacement for many applications to
improve the LED current accuracy and regulation.
Typical Application Circuit
8.0 - 450VDC
1
VIN
5 PWMD GATE 4
HV9961
6 VDD
CS 2
RT
7 LD GND RT 8
3
Sets
RCS
LED
Current
LED
Load
Supertex inc.
www.supertex.com
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