LM3406_15 Datasheet, PDF (1/38 Pages) Texas Instruments – Constant Current, Buck Regulator for Driving High Power LEDs

LM3406, LM3406HV, LM3406HV-Q1
SNVS512E – SEPTEMBER 2008 – REVISED MARCH 2014
LM3406 1.5-A, Constant Current, Buck Regulator for Driving High Power LEDs
1 FEATURES
•1 LM3406HV-Q1
– Automotive Grade Device
– AEC-Q100 Grade 1 Qualified
– Operating Ambient Temperature: –40°C to
125°C
• Integrated 2.0A MOSFET
• V_IN Range 6V to 42V (LM3406)
• V_IN Range 6V to 75V (LM3406HV)
• V_IN Range 6V to 75V (LM3406HV-Q1)
• 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
3 DESCRIPTION
The LM3406 family 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.
The LM3406HV-Q1 is AEC-Q100 grade 1 qualified.
2 APPLICATIONS
• LED Driver
• Constant Current Source
• Automotive Lighting
• General Illumination
• Industrial Lighting
3.1 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
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.