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LED DRIVER. IS31LT3352 Datasheet

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LED DRIVER. IS31LT3352 Datasheet






IS31LT3352 DRIVER. Datasheet pdf. Equivalent




IS31LT3352 DRIVER. Datasheet pdf. Equivalent





Part

IS31LT3352

Description

40V LED DRIVER



Feature


IS31LT3352 40V LED DRIVER WITH TEMPERATU RE COMPENSATION OCTOBER 2011 GENERAL DE SCRIPTION The IS31LT3352 is a continuou s mode inductive step-down converter, d esigned for driving a single LED or mul tiple series connected LEDs efficiently from a voltage source higher than the required LED voltage. The chip operates from an input supply between 6V and 40 V and provides an .
Manufacture

ISSI

Datasheet
Download IS31LT3352 Datasheet


ISSI IS31LT3352

IS31LT3352; externally adjustable output current of up to 750mA. Depending upon supply volt age and external components, this can p rovide up to 30 watts of output power. The IS31LT3352 includes an integrated o utput switch and a high-side output cur rent sensing circuit, which uses an ext ernal resistor to set the nominal avera ge output current. The IS31LT3352 integ rates temperature .


ISSI IS31LT3352

compensation function in order to mainta in LEDs’ stable and reliable operatio n. The IS31LT3352 measures the thermist ance mounted close to LEDs. When ambien t temperature near LEDs goes too high a nd the Negative Temperature Coefficient thermistors reach the value of thresho ld resistance connected at RTH pin, out put current starts to reduce automatica lly. After the ambie.


ISSI IS31LT3352

nt temperature falls down to a safe temp erature,the current will return to th e set value. The IS31LT3352 can be conn ected as LED drivers’ chain with the same temperature compensation percentag e. In this chain, every IS31LT3352’s ADJO output pin drives next stage’s I S31LT3352 ADJI input pin with temperatu re compensation information. So, only o ne thermistor is needed in.

Part

IS31LT3352

Description

40V LED DRIVER



Feature


IS31LT3352 40V LED DRIVER WITH TEMPERATU RE COMPENSATION OCTOBER 2011 GENERAL DE SCRIPTION The IS31LT3352 is a continuou s mode inductive step-down converter, d esigned for driving a single LED or mul tiple series connected LEDs efficiently from a voltage source higher than the required LED voltage. The chip operates from an input supply between 6V and 40 V and provides an .
Manufacture

ISSI

Datasheet
Download IS31LT3352 Datasheet




 IS31LT3352
IS31LT3352
40V LED DRIVER WITH TEMPERATURE COMPENSATION
OCTOBER 2011
GENERAL DESCRIPTION
The IS31LT3352 is a continuous mode inductive
step-down converter, designed for driving a single LED or
multiple series connected LEDs efficiently from a voltage
source higher than the required LED voltage. The chip
operates from an input supply between 6V and 40V and
provides an externally adjustable output current of up to
750mA. Depending upon supply voltage and external
components, this can provide up to 30 watts of output
power.
The IS31LT3352 includes an integrated output switch
and a high-side output current sensing circuit, which uses
an external resistor to set the nominal average output
current.
The IS31LT3352 integrates temperature compensation
function in order to maintain LEDs’ stable and reliable
operation. The IS31LT3352 measures the thermistance
mounted close to LEDs. When ambient temperature near
LEDs goes too high and the Negative Temperature
Coefficient thermistors reach the value of threshold
resistance connected at RTH pin, output current starts to
reduce automatically. After the ambient temperature falls
down to a safe temperaturethe current will return to the
set value.
The IS31LT3352 can be connected as LED drivers’ chain
with the same temperature compensation percentage. In
this chain, every IS31LT3352’s ADJO output pin drives
next stage’s IS31LT3352 ADJI input pin with temperature
compensation information. So, only one thermistor is
needed in the whole IS31LT3352 system.
FEATURES
Simple low parts count
Internal 40V power switch
Wide input voltage range: 6V to 40V
Up to 750mA output current
High efficiency (up to 95% )
12001 dimming ratio
Typical 5% output current accuracy
Single pin on/off and brightness control using DC
voltage or PWM
Up to 1MHz switching frequency
Inherent open-circuit LED protection
Thermal shutdown to protect IC itself
Temperature compensation to protect LEDs
APPLICATIONS
Low voltage halogen replacement LEDs
Automotive lighting
Low voltage industrial lighting
LED back-up lighting
Illuminated signs
http://www.DataSheet4U.net/
APPLICATION CIRCUIT
IS31LT3352
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, 09/01/2011
1
datasheet pdf - http://www.DataSheet4U.net/




 IS31LT3352
IS31LT3352
SYSTEM APPLICATION
IS31LT3352
IS31LT3352
http://www.DataSheet4U.net/
IS31LT3352
Note:
Each IS31LT3352 can driver up to three slave chips in the next stages, and it is recommend no more than three stages are used for the current
coherence, therefore, up to thirteen IS31LT3352s are allowed in one system
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 09/01/2011
2
datasheet pdf - http://www.DataSheet4U.net/




 IS31LT3352
IS31LT3352
PIN CONFIGURATIONS
Package
SOP8
Pin Configurations
PIN DESCRIPTION
Pin
Name
NO.
VIN 1
ISENSE
2
RTH 3
RNTC
4
ADJO
5
ADJI
6
GND
LX
7
8
Description
Input voltage (6V to 40V). Decouple to ground with 1μF or higher X7R ceramic capacitor
close to device
Connect resistor RS from this pin to VIN to define nominal average output current IOUTnom
=0.1/RS
The pin set the starting temperature of temperature compensation by connecting an
external resistor.
The output currents reduction slope set pin by connecting an external thermistor in
temperature compensation mode.
LED drivers chain application pin.
* When R3(NTC)>R2,VADJO=VADJI
http://www.DataSheet4U.net/
* When R3(NTC)<R2, ADJO pin outputs ADJI voltage with temperature compensation
information
VADJIO=VADJI*R3/R2
Multi-function On/Off and brightness control pin:
* Leave floating for normal operation.(VADJI = VREF = 1.2V giving nominal average output
current IOUT nom=0.1/RS )
* Drive to voltage below 0.2V to turn off output current
* Drive with DC voltage (0.3V<VADJI <1.2V) to adjust output current from 25% to 100% of
IOUTnom
* Drive with PWM signal to adjust output current.
*When driving the ADJI pin above 1.2V, the current will be clamped to 100% brightness
automatically.
Ground (0V)
Drain of power switch
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 09/01/2011
3
datasheet pdf - http://www.DataSheet4U.net/



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