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LM3405AXMK 데이터시트(PDF) 1 Page - Texas Instruments

부품명 LM3405AXMK
상세설명  LM3405A 1.6MHz, 1A Constant Current Buck LED Driver with Internal ensation in Tiny SOT and VSSOP PowerPAD Packages
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제조업체  TI [Texas Instruments]
홈페이지  http://www.ti.com
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LM3405AXMK 데이터시트(HTML) 1 Page - Texas Instruments

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LM3405A
VIN
VIN
EN/DIM
BOOST
SW
FB
GND
C3
L1
C2
R1
D1
C1
IF
ON
OFF
C4
VOUT
D2
D3
LM3405A
www.ti.com
SNVS508C – OCTOBER 2007 – REVISED MAY 2013
LM3405A 1.6MHz, 1A Constant Current Buck LED Driver with Internal Compensation in
Tiny SOT and VSSOP PowerPAD Packages
Check for Samples: LM3405A
1
FEATURES
DESCRIPTION
The LM3405A is a 1A constant current buck LED
2
VIN Operating Range of 3V to 22V
driver designed to provide a simple, high efficiency
Drives up to 5 High-Brightness LEDs in Series
solution for driving high power LEDs. With a 0.205V
at 1A
reference voltage feedback control to minimize power
Thin SOT-6 package and VSSOP-8 PowerPAD
dissipation, an external resistor sets the current as
needed for driving various types of LEDs. Switching
Packages
frequency is internally set to 1.6MHz, allowing small
1.6MHz Switching Frequency
surface mount inductors and capacitors to be used.
EN/DIM Input for Enabling and PWM Dimming
The LM3405A utilizes current-mode control and
of LEDs
internal compensation offering ease of use and
predictable, high performance regulation over a wide
300m
Ω NMOS Switch
range of operating conditions. With a maximum input
40nA Shutdown Current at VIN = 5V
voltage of 22V, it can drive up to 5 High-Brightness
Internally Compensated Current-mode Control
LEDs in series at 1A forward current, with the single
Cycle-by-cycle Current Limit
LED
forward
voltage
of
approximately
3.7V.
Additional features include user accessible EN/DIM
Input Voltage UVLO
pin for enabling and PWM dimming of LEDs, thermal
Over-current Protection
shutdown, cycle-by-cycle current limit and over-
Thermal Shutdown
current protection.
APPLICATIONS
LED Driver
Constant Current Source
Industrial Lighting
LED Flashlights
LED Lightbulbs
TYPICAL APPLICATION CIRCUIT
Efficiency vs LED Current (VIN = 12V)
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2007–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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