SQ9910 Datasheet, PDF (1/10 Pages) List of Unclassifed Manufacturers – Universal High Brightness LED Driver

SQ9910/SQ9910A
Universal High Brightness LED Driver
FEATURES
● >90% Efficiency
● Universal rectified 85 to 265V_AC 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 500V
● Internal Thermal Protection (OTP)
● 7.5V MOSFET drive – SQ9910
10V MOSFET drive – SQ9910A
TYPICAL APPLICATIONS
● DC/DC or AC/DC LED Driver application
● RGB Backlighting LED Driver
● Back Lighting of Flat Panel Displays
● General purpose constant current source
● Signage and Decorative LED Lighting
APPLICATION CIRCUIT
PRODUCT DESCRIPTION
The SQ9910 is a PWM high-efficiency LED driver
control IC. It allows efficient operation of High
Brightness (HB) LEDs from voltage sources
ranging from 85V_AC up to 265V_AC . The SQ9910
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 SQ9910 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 SQ9910. The
SQ9910 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