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IS31LT3354のメーカーはISSIです、この部品の機能は「40V LED DRIVER」です。 |
部品番号 | IS31LT3354 |
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部品説明 | 40V LED DRIVER | ||
メーカ | ISSI | ||
ロゴ | |||
このページの下部にプレビューとIS31LT3354ダウンロード(pdfファイル)リンクがあります。 Total 12 pages
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/
1 Page 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 KΩ
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 09/01/2011
3
datasheet pdf - http://www.DataSheet4U.net/
3Pages IS31LT3354
500
400
300
200
100
0
0 5 10 15 20 25 30 35 40
Vin (V)
Supply Current vs. Vin (Operating)
120
100
80
60
40
20
0
0 5 10 15 20 25 30 35
Vin(V)
Shutdown Current vs. Vin (Quiescent)
40
1.201
1.2005
1.2
1.1995
1.199
1.1985
5
10 15 20 25 30 35 40
Vin(V)
http://www.DataSheet4U.net/
Vref vs. Vin
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 09/01/2011
6
datasheet pdf - http://www.DataSheet4U.net/
6 Page | |||
ページ | 合計 : 12 ページ | ||
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PDF ダウンロード | [ IS31LT3354 データシート.PDF ] |
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