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LED DRIVER. IS31LT3350 Datasheet

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LED DRIVER. IS31LT3350 Datasheet






IS31LT3350 DRIVER. Datasheet pdf. Equivalent




IS31LT3350 DRIVER. Datasheet pdf. Equivalent





Part

IS31LT3350

Description

40V LED DRIVER



Feature


IS31LT3350 40V LED DRIVER WITH INTERNAL SWITCH GENERAL DESCRIPTION The IS31LT33 50 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 LED voltage. The chip operates from an input supply between 6 V and 40V and provides an externally ad justable output cu.
Manufacture

ISSI

Datasheet
Download IS31LT3350 Datasheet


ISSI IS31LT3350

IS31LT3350; rrent of up to 750mA. Depending upon sup ply voltage and external components, th is can provide up to 30 watts of output power. The IS31LT3350 includes an inte grated output switch and a high-side ou tput current sensing circuit, which use s an external resistor to set the nomin al average output current. Output curre nt can be adjusted linearly by applying an external contr.


ISSI IS31LT3350

ol signal to the ADJ pin. The ADJ pin wi ll accept either a DC voltage or a PWM waveform. This will provide either a co ntinuous or a gated output current. App lying a voltage of 0.2V or lower to the ADJ pin turns the output off and switc hes the chip into a low current standby state. The chip is assembled in SOT23- 5 and SOT89-5 package. SOT23-5 is avail able for 350mA out.


ISSI IS31LT3350

put current application. SOT89-5 is avai lable for 750mA output current applicat ion. APPLICATION CIRCUIT http://www.Dat aSheet4U.net/ OCTOBER 2011 FEATURES S imple low parts count Internal 40V pow er switch Wide input voltage range: 6V to 40V Up to 750mA output current(S OT89-5 package) High efficiency (up to 95% ) Typical 1200:1 dimming rati o Typical 5% output cur.

Part

IS31LT3350

Description

40V LED DRIVER



Feature


IS31LT3350 40V LED DRIVER WITH INTERNAL SWITCH GENERAL DESCRIPTION The IS31LT33 50 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 LED voltage. The chip operates from an input supply between 6 V and 40V and provides an externally ad justable output cu.
Manufacture

ISSI

Datasheet
Download IS31LT3350 Datasheet




 IS31LT3350
IS31LT3350
40V LED DRIVER WITH INTERNAL SWITCH
GENERAL DESCRIPTION
The IS31LT3350 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 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 IS31LT3350 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.
Output current can be adjusted linearly by applying an
external control signal to the ADJ pin. The ADJ pin will
accept either a DC voltage or a PWM waveform. This will
provide either a continuous or a gated output current.
Applying a voltage of 0.2V or lower to the ADJ pin turns
the output off and switches the chip into a low current
standby state.
The chip is assembled in SOT23-5 and SOT89-5
package. SOT23-5 is available for 350mA output current
application. SOT89-5 is available for 750mA output
current application.
APPLICATION CIRCUIT
OCTOBER 2011
FEATURES
Simple low parts count
Internal 40V power switch
Wide input voltage range: 6V to 40V
Up to 750mA output currentSOT89-5
package
High efficiency (up to 95% )
Typical 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 protection circuitry
Two packages available for different current
APPLICATIONS
Low voltage halogen replacement LEDs
Automotive lighting
Low voltage industrial lighting
LED back-up lighting
Illuminated sign
http://www.DataSheet4U.net/
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, 10/18/2011
1
datasheet pdf - http://www.DataSheet4U.net/




 IS31LT3350
IS31LT3350
PIN CONFIGURATIONS
Package
Pin Configurations (Top View)
SOT23-5
LX
GND
15
2
VIN
ADJ 3 4
ISENSE
SOT89-5
PIN DESCRIPTION
Pin Name NO.
LX 1
GND
2
ADJ 3
ISENSE
VIN
4
5
Description
Drain of power switch
Ground (0V)
Multi-function On/Off and brightness control pin:
* Leave floating for normal operation.(VADJ = 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<VADJ <1.2V) tohttp://www.DataSheet4U.net/ adjust output current from 25% to 100% of IOUTnom
* Drive with PWM signal to adjust output current.
* When driving the ADJ pin above 1.2V, the current will be clamped to 100% brightness
automatically.
Connect resistor RS from this pin to VIN to define nominal average output current IOUTnom =0.1/RS
Input voltage (6V to 40V). Decouple to ground with 1μF or higher X7R ceramic capacitor close to
device
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 10/18/2011
2
datasheet pdf - http://www.DataSheet4U.net/




 IS31LT3350
IS31LT3350
ORDERING INFORMATION
Industrial Range: -40°C to +85°C
Order Part No.
IS31LT3350-V1STLS2-TR
IS31LT3350-V2STLS2-TR
IS31LT3350-V1SDLS2-TR
IS31LT3350-V2SDLS2-TR
Package
SOT23-5, Lead-free
SOT23-5, Lead-free
SOT89-5, Lead-free
SOT89-5, Lead-free
QTY/Reel
3000
3000
2500
2500
V SENSE
91mV~101mV
99mV~110mV
91mV~101mV
99mV~110mV
http://www.DataSheet4U.net/
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 10/18/2011
3
datasheet pdf - http://www.DataSheet4U.net/



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