HV9910 Datasheet, PDF (1/11 Pages) Supertex, Inc – Universal High Brightness LED Driver

HV9910
Universal High Brightness LED Driver
Features
>90% Efficiency
8V to 450V input range
Constant-current LED driver
Applications from a few mA to more than 1A
Output
LED string from one to hundreds of diodes
PWM Low-Frequency Dimming via Enable pin
Input Voltage Surge ratings up to 450V
Applications
DC/DC or AC/DC LED Driver applications
RGB Backlighting LED Driver
Back Lighting of Flat Panel Displays
General purpose constant current source
Signage and Decorative LED Lighting
Automotive
Chargers
Typical Application
Description
The HV9910 is a PWM high-efficiency LED driver
control IC. It allows efficient operation of High
Brightness (HB) LEDs from voltage sources
ranging from 8VDC up to 450VDC. The HV9910
controls an external MOSFET at fixed switching
frequency up to 300kHz. The frequency can be
programmed using a single resistor. The LED string
is driven at constant current rather than constant
voltage, thus providing constant light output and
enhanced reliability. The output current can be
programmed between a few milliamps and up to
more than 1.0A.
HV9910 uses a rugged high voltage junction
isolated process that can withstand an input voltage
surge of up to 450V. Output current to an LED
string can be programmed to any value between
zero and its maximum value by applying an
external control voltage at the linear dimming
control input of the HV9910. The HV9910 provides
a low-frequency PWM dimming input that can
accept an external control signal with a duty ratio of
0-100% and a frequency of up to a few kilohertz.
C110504
1
C110504