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LM3405 Datenblatt(PDF) 1 Page - Texas Instruments

Teilenummer LM3405
Bauteilbeschribung  Constant Current Buck Regulator
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Hersteller  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM3405 Datenblatt(HTML) 1 Page - Texas Instruments

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LM3405
VIN
VIN
EN/DIM
BOOST
SW
FB
GND
C3
L1
C2
R1
D1
D2
C1
IF
ON
OFF
C4
VOUT
LM3405
www.ti.com
SNVS429B – OCTOBER 2006 – REVISED MAY 2013
LM3405 1.6MHz, 1A Constant Current Buck Regulator for Powering LEDs
Check for Samples: LM3405
1
FEATURES
DESCRIPTION
Integrated with a 1A power switch, the LM3405 is a
2
VIN Operating Range of 3V to 15V
current-mode
control
switching
buck
regulator
Thin SOT-6 Package
designed to provide a simple, high efficiency solution
1.6MHz Switching Frequency
for driving high power LEDs. With a 0.205V reference
voltage
feedback
control
to
minimize
power
300m
Ω NMOS Switch
dissipation, an external resistor sets the current as
40nA Shutdown Current at VIN = 5V
needed for driving various types of LEDs. Switching
EN/DIM Input for Enabling and PWM Dimming
frequency is internally set to 1.6MHz, allowing small
of LEDs
surface mount inductors and capacitors to be used.
The
LM3405
utilizes
current-mode
control
and
Internally Compensated Current-mode Control
internal compensation offering ease of use and
Cycle-by-cycle Current Limit
predictable, high performance regulation over a wide
Input Voltage UVLO
range of operating conditions. Additional features
include user accessible EN/DIM pin for enabling and
Over-current Protection
PWM dimming of LEDs, thermal shutdown, cycle-by-
Thermal Shutdown
cycle current limit and over-current protection.
APPLICATIONS
LED Driver
Constant Current Source
Industrial Lighting
LED Flashlights
TYPICAL APPLICATION CIRCUIT
Efficiency vs LED Current (VIN = 5V)
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 © 2006–2013, 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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