GM9910B Datasheet, PDF (1/8 Pages) Gamma Microelectronics Inc. – UNIVERAL HIGH BRIGHTNESS LED DRIVER

GM9910B
UNIVERAL HIGH BRIGHTNESS
LED DRIVER
Description
Features
The GM9910B is a PWM high efficiency control ‹
LED driver IC. It allows efficient operation of
High Brightness (HB) LEDs from voltage sources
‹
ranging from 10VDC up to 500VDC, this feature ‹
allows GM9910B can work from a wide range of
input voltages without the need for an external
‹
low voltage supply.
By using a single resistor, the switching
‹
frequency to control the external MOSFET can
be fixed up to 300KHz. GM9910B is constant
‹
current LED driver, which enhance the reliability.
The output current can be programmed between
a few milliamps and up to more than 1.0A.
‹
> 90% efficiency
Wide input range – 10V to 500V
Constant current LED driver
Applications from a few mA to more than
1A
LED string from one to hundreds of
diodes
PWM low frequency dimming via enable
pin
Input voltage surge rating up to 500V
GM9910B uses a rugged high voltage junction
isolated process that can withstand an input
voltage surge of up to 500V. 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 GM9910B. The
GM9910B 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.
Applications
„ AC/DC or DC/DC LED Driver Applications „
„ RGB Backlighting LED Driver
„
Back Lighting of Flat Panel Displays
General Purpose Constant Current
Source
Typical Application Circuit
C_IN
V_IN
PWMD GATE
GM9910B
VDD
LD
CS
RT GND
C_DD
R_T
C_O
D1
L1
R_CS
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