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LED DRIVER. IS31LT3354 Datasheet

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LED DRIVER. IS31LT3354 Datasheet






IS31LT3354 DRIVER. Datasheet pdf. Equivalent




IS31LT3354 DRIVER. Datasheet pdf. Equivalent





Part

IS31LT3354

Description

40V LED DRIVER



Feature


IS31LT3354 40V LED DRIVER WITH EXTERNAL SWITCH GENERAL DESCRIPTION The IS31LT33 54 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 device operates from an input suppl y between 6V and 40V and provides an ex ternally adjustabl.
Manufacture

ISSI

Datasheet
Download IS31LT3354 Datasheet


ISSI IS31LT3354

IS31LT3354; e output current of up to 2A or even hig her, which is determined by the externa l MOSFET and inductor. The IS31LT3354 i ncludes a high-side output current sens ing circuit, which uses an external res istor to set the nominal average output current. Output current can be adjuste d linearly by applying an external cont rol signal to the ADJ pin. The ADJ pin will accept either.


ISSI IS31LT3354

a DC voltage or a PWM waveform. This wi ll provide either a continuous or a gat ed output current. Applying a voltage o f 0.2V or lower to the ADJ pin turns th e output off and switches the chip into a low current standby state. The chip is assembled in SOT23-5 package. SEPTE MBER 2011 FEATURES Simple low parts co unt Wide input voltage range: 6V to 40 V Output Current .


ISSI IS31LT3354

only limited by external component selec tion High efficiency (up to 98% ) Typ ical 1200:1 dimming ratio Typical 3% o utput current accuracy Single pin on/o ff and brightness control using DC volt age or PWM Up to 1MHz switching freque ncy Inherent open-circuit LED protecti on Thermal shutdown protection circuit ry APPLICATIONS Low voltage halogen re placement LEDs Au.

Part

IS31LT3354

Description

40V LED DRIVER



Feature


IS31LT3354 40V LED DRIVER WITH EXTERNAL SWITCH GENERAL DESCRIPTION The IS31LT33 54 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 device operates from an input suppl y between 6V and 40V and provides an ex ternally adjustabl.
Manufacture

ISSI

Datasheet
Download IS31LT3354 Datasheet




 IS31LT3354
IS31LT3354
40V LED DRIVER WITH EXTERNAL SWITCH
GENERAL DESCRIPTION
The IS31LT3354 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 device operates from an input supply between 6V
and 40V and provides an externally adjustable output
current of up to 2A or even higher, which is determined
by the external MOSFET and inductor.
The IS31LT3354 includes 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 package.
TYPICAL APPLICATION CIRCUIT
Vin( DC)=6V~40V
Rs
SEPTEMBER 2011
FEATURES
Simple low parts count
Wide input voltage range: 6V to 40V
Output Current only limited by external
component selection
High efficiency (up to 98% )
Typical 1200:1 dimming ratio
Typical 3% 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
APPLICATIONS
Low voltage halogen replacement LEDs
Automotive lighting
Low voltage industrial lighting
LED back-up lighting
Illuminated sign
C1 C2
0.1uF
http://www.DataSheet4U.net/
5
VIN
D1
4
I SENSE
3 ADJ ISS3N13L3T534354 1
GATE
GND
2
C3
L1
AP2306
up to
10 LEDs
Figure 1 Typical IS31LT3354 Application Schematic
 
 
 
 
 
 
 
 
 
 
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/




 IS31LT3354
IS31LT3354
PIN CONFIGURATION
Package
Pin Configuration (Top view)
SOT23-5
PIN DESCRIPTION
Pin Name NO. Description
GATE
1 Output gate driver for an external NMOSFET
GND
2 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 )
ADJ
3
* Drive to voltage below 0.2V to turn off output current
* Drive with DC voltage (0.3V<VADJ <1.2V) to 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.
ISENSE
VIN
4
Connect resistor RS from this pin to VIN to define nominal average output current IOUTnom
=0.1/RS
5
Input voltage (6V to 40V). Decouple to ground with 1μF or higher X7R ceramic capacitor close
to device
ORDERING INFORMATION
http://www.DataSheet4U.net/
INDUSTRIAL RANGE: -40°C TO +85°C
Order Part No.
Package
QTY/Reel
IS31LT3354–STLS2-TR SOT23-5, Lead-free
3000
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 09/01/2011
2
datasheet pdf - http://www.DataSheet4U.net/




 IS31LT3354
IS31LT3354
ABSOLUTE MAXIMUM RATINGS (NOTE 1)
Symbol Parameter
VIN Input voltage
VISENSE ISENSE voltage
VGATE
VADJ
Ptot
TOP
TST
Tj MAX
RJA
GATE pin voltage
Adjust pin input voltage
Power dissipation
Operating temperature
Storage temperature
Junction temperature
Junction to ambient
ESD Susceptibility (human body model)
Rating
-0.3V to +50V
VIN+0.3V to VIN-5V ,VIN>5V
VIN+0.3V to -0.3V,VIN<5V
-0.3V to +6V
-0.3V to +6V
600mW @SOT23-5
-40 to 85°C
-55 to 150°C
150°C
108°C/W @SOT23-5
4kV
ELECTRICAL CHARACTERISTICS
TA = 25°C (Note 2)
Symbol Parameter
VIN Input voltage
IINQoff
IINQon
Quiescent supply current with output off
Quiescent supply current with output
switching
VSENSE
Mean current sense threshold voltage
VSENSEHYS Sense threshold hysteresis
Conditions
ADJ pin grounded
ADJ pin floating
http://www.DataSheet4U.net/
Min. Typ. Max.
6 40
80 95 110
450 600
91 96 101
±15
ISENSE
VREF
VADJ
VADJoff
ISENSE pin input current
VSENSE = 0.1V
8 10
Internal reference voltage
Measured on ADJ pin
with pin floating
1.2
External control voltage range on ADJ pin for
dc brightness control
0.3 1.2
DC voltage on ADJ pin to switch chip from
active (on) state to quiescent (off) state
VADJ falling
0.15 0.2 0.25
Unit
V
μA
μA
mV
%
μA
V
V
V
VADJon
DC voltage on ADJ pin to switch chip from
quiescent (off) state to active (on) state
VADJ rising
0.2 0.25 0.3
V
RADJ
Resistance between ADJ pin and VREF
500 K
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 09/01/2011
3
datasheet pdf - http://www.DataSheet4U.net/



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