IS31LT3910-GRLS2 Datasheet, PDF (1/10 Pages) Integrated Silicon Solution, Inc – UNIVERSAL HIGH BRIGHTNESS LED DRIVER WITH TEMPERATURE COMPENSATION

IS31LT3910
UNIVERSAL HIGH BRIGHTNESS LED DRIVER
WITH TEMPERATURE COMPENSATION
May 2014
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
 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
TYPICAL APPLICATION CIRCUIT
V_INDC
8V ~ 450V
R_IN
C_IN C_OFF
8
VCC
7
TOFF
D₁
C₁
L₁
NTC
5
GATE
M₁
2 ^IS31LT3910
PWMD
1
6
VREF
CS
R₁
3
LD
4
R_CS
GND
C₂
Figure 1 Typical Application Circuit
Integrated Silicon Solution, Inc. – www.issi.com
1
Rev. B, 05/12/2014