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LED DRIVER. IS31LT3910 Datasheet

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LED DRIVER. IS31LT3910 Datasheet






IS31LT3910 DRIVER. Datasheet pdf. Equivalent




IS31LT3910 DRIVER. Datasheet pdf. Equivalent





Part

IS31LT3910

Description

UNIVERSAL HIGH BRIGHTNESS LED DRIVER



Feature


IS31LT3910 UNIVERSAL HIGH BRIGHTNESS LED DRIVER WITH TEMPERATURE COMPENSATION G ENERAL DESCRIPTION The IS31LT3910 is a peak current mode control LED driver IC . The IS31LT3910 operates in constant o ff-time mode. It allows efficient opera tion of High Brightness (HB) LEDs with voltage sources ranging from 8VDC to 45 0DC or 110VAC/220VAC. The IS31LT3910 in cludes a PWM dimmi.
Manufacture

ISSI

Datasheet
Download IS31LT3910 Datasheet


ISSI IS31LT3910

IS31LT3910; ng input that can accept an external con trol signal with a duty ratio of 0 - 10 0% and a frequency of up to a few kiloh ertz. It also includes a 0 240mV linear dimming input which can be used both f or linear dimming and temperature compe nsation of the LED current. The IS31LT3 910 is ideally suited for buck LED driv ers. Since the IS31LT3910 operates in p eak current mode c.


ISSI IS31LT3910

ontrol, the controller achieves good out put current regulation without the need for any loop compensation. It achieves good PWM dimming response because the response time is limited only by the ra te of rise and fall of the inductor cur rent, enabling very fast rise and fall time. APPLICATION CIRCUIT November 2011 FEATURES Wide input range from 8VDC t o 450DC or 110VAC/.


ISSI IS31LT3910

220 VAC Temperature compensation to reg ulate LED current Application from a f ew mA to more than 1A output Constant off-time operation Linear and PWM dimm ing 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 S.

Part

IS31LT3910

Description

UNIVERSAL HIGH BRIGHTNESS LED DRIVER



Feature


IS31LT3910 UNIVERSAL HIGH BRIGHTNESS LED DRIVER WITH TEMPERATURE COMPENSATION G ENERAL DESCRIPTION The IS31LT3910 is a peak current mode control LED driver IC . The IS31LT3910 operates in constant o ff-time mode. It allows efficient opera tion of High Brightness (HB) LEDs with voltage sources ranging from 8VDC to 45 0DC or 110VAC/220VAC. The IS31LT3910 in cludes a PWM dimmi.
Manufacture

ISSI

Datasheet
Download IS31LT3910 Datasheet




 IS31LT3910
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
http://www.DataSheet4U.net/
D1
L1
Rin
IS31LT3910
VIN
R1
Cin
VREF
LD
PWMD
TOFF
C2 COFF
GATE
Q1
CS
GND
RCS
C1
LEDS
NTC
Integrated Silicon Solution, Inc. — www.issi.com
Rev.A, 11/08/2011
1
datasheet pdf - http://www.DataSheet4U.net/




 IS31LT3910
IS31LT3910
PIN CONFIGURATIONS
Package
SOP-8
Pin Configurations (Top View)
VREF
PWMD
LD
GND
VIN
TOFF
CS
GATE
PIN DESCRIPTION
Pin
VREF
Pin No.
1
PWMD 2
LD 3
GND 4
GATE 5
CS 6
TOFF
7
VIN 8
Description
This pin provides reference a voltage of 1.2V, no bypass
capacitor is needed.
This is the PWM dimming input of the IC. When this pin is pulled
to GND, the gate driver is turned off.
When the pin is pulled high, the gate driver operates normally.
This pin is the linear dimming input and sets the current sense
threshold as long as the voltage at the pin is less than 240mV
(typ.). It can also used as temperature compensation threshold
voltage.
Ground return for all internal circuitry. This pin must be electrically
connected to ground.
This pin is the output gate driver for an external N-channel power
MOSFET.
http://www.DataSheet4U.net/
This pin is the current sense pin used to sense the MOSFET
current by means of an external sense resistor.
When this pin exceeds the lower of either the internal 240mV or
the voltage at the LD pin, the gate output goes low.
This pin sets the off time of the power MOSFET. If left floating
then the off time will be 510ns. When a capacitor is connected
between TOFF and GND, the off time is increased.
This pin is the input of an 8V to 450V voltage supply through a
resistor, clamped at 7.1V internally, it must be bypassed with a
capacitor to GND.
Copyright © 2011 Integrated Silicon Solution, Inc. All rights reserved. ISSI reserves the right to make changes to this specification and its products at any 
time without notice. ISSI assumes no liability arising out of the application or use of any information, products or services described herein. Customers are 
advised to obtain the latest version of this device specification before relying on any published information and before placing orders for products. 
Integrated Silicon Solution, Inc. does not recommend the use of any of its products in life support applications where the failure or malfunction of the 
product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not 
authorized for use in such applications unless Integrated Silicon Solution, Inc. receives written assurance to its satisfaction, that: 
a.) the risk of injury or damage has been minimized; 
b.) the user assume all such risks; and 
c.) potential liability of Integrated Silicon Solution, Inc is adequately protected under the circumstances
Integrated Silicon Solution, Inc. — www.issi.com
Rev.A, 11/08/2011
2
datasheet pdf - http://www.DataSheet4U.net/




 IS31LT3910
IS31LT3910
ORDERING INFORMATION
Industrial Rage: -40°C to +85°C
Order Part No.
IS31LT3910-GRLS2-TR
Package
SOP-8, Lead-free
QTY/Reel
2500
http://www.DataSheet4U.net/
Integrated Silicon Solution, Inc. — www.issi.com
Rev.A, 11/08/2011
3
datasheet pdf - http://www.DataSheet4U.net/



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