LM3406 Datasheet, PDF (1/37 Pages) National Semiconductor (TI) – 1.5A Constant Current Buck Regulator for Driving High Power LEDs

LM3406, LM3406HV
www.ti.com
SNVS512C – SEPTEMBER 2008 – REVISED FEBRUARY 2010
LM3406/06HV 1.5A Constant Current Buck Regulator for Driving High Power LEDs
Check for Samples: LM3406, LM3406HV
FEATURES
1
•2 Integrated 2.0A MOSFET
• V_IN Range 6V to 42V (LM3406)
• V_IN Range 6V to 75V (LM3406HV)
• True Average Output Current Control
• 1.7A Minimum Output Current Limit Over
Temperature
• Cycle-by-Cycle Current Limit
• PWM Dimming with Dedicated Logic Input
• PWM Dimming with Power Input Voltage
• Simple Control Loop Compensation
• Low Power Shutdown
• Supports All-Ceramic Output Capacitors and
Capacitor-less Outputs
• Thermal Shutdown Protection
• TSSOP-14 Package
DESCRIPTION
The LM3406/06HV are monolithic switching
regulators designed to deliver constant currents to
high power LEDs. Ideal for automotive, industrial, and
general lighting applications, they contain a high-side
N-channel MOSFET switch with a current limit of
2.0A (typical) for step-down (Buck) regulators.
Controlled on-time with true average current and an
external current sense resistor allow the converter
output voltage to adjust as needed to deliver a
constant current to series and series-parallel
connected LED arrays of varying number and type.
LED dimming via pulse width modulation (PWM) is
achieved using a dedicated logic pin or by PWM of
the power input voltage. The product feature set is
rounded out with low-power shutdown and thermal
shutdown protection.
APPLICATIONS
• LED Driver
• Constant Current Source
• Automotive Lighting
• General Illumination
• Industrial Lighting
TYPICAL APPLICATION
V_IN
C_IN
C_B
L1
VIN,VINS BOOT
SW
R_ON
D1
RON
LM3406/06HV
I_F
VOUT
DIM
CS
R_SNS
COMP
GND
VCC
C_C
C_F
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.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2008–2010, Texas Instruments Incorporated