IS31LT3910 Datasheet, PDF (1/8 Pages) Integrated Silicon Solution, Inc – UNIVERSAL HIGH BRIGHTNESS LED DRIVER

IS31LT3910
UNIVERSAL HIGH BRIGHTNESS LED DRIVER
WITH TEMPERATURE COMPENSATION
GENERAL DESCRIPTION
The IS31LT3910 is a peak current mode control LED
driver IC. The IS31LT3910 operates in constant off-time
mode. It allows efficient operation of High Brightness
(HB) LEDs with voltage sources ranging from 8VDC to
450DC or 110VAC/220VAC. The IS31LT3910 includes
a 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. It also includes a 0 -
240mV linear dimming input which can be used both for
linear dimming and temperature compensation of the
LED current.
The IS31LT3910 is ideally suited for buck LED drivers.
Since the IS31LT3910 operates in peak current mode
control, the controller achieves good output current
regulation without the need for any loop compensation.
It achieves good PWM dimming response because the
response time is limited only by the rate of rise and fall
of the inductor current, enabling very fast rise and fall
time.
FEATURES
November 2011
 Wide input range from 8VDC to 450DC or
110VAC/220 VAC
 Temperature compensation to regulate LED current
 Application from a few mA to more than 1A output
 Constant off-time operation
 Linear and PWM dimming capability
 Switch mode controller for single switch LED
drivers
 Requires few external components for operation
APPLICATIONS
 DC/DC or AC/DC LED driver applications
 General purpose constant current source
 Signal and decorative LED lighting
 backlighting LED driver
APPLICATION CIRCUIT
VinDC8~450V
D1
L1
Rin
IS31LT3910
VIN
R1
Cin
VREF
LD
PWMD
TOFF
C2 ^COFF
GATE
Q1
CS
GND
R_CS
C1
LEDS
NTC
Integrated Silicon Solution, Inc. — www.issi.com
1
Rev.A, 11/08/2011