HV9910_07 Datasheet, PDF (1/8 Pages) Supertex, Inc – Universal High Brightness LED Driver

Universal High Brightness
LED Driver
HV9910
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
General 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.
The 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.
V_IN
V_DD
HV9910
LD
GATE
PWMD
CS
R_T GND