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LM3406 Datasheet, PDF (1/26 Pages) National Semiconductor (TI) – 1.5A Constant Current Buck Regulator for Driving High Power LEDs | |||
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September 4, 2008
LM3406/06HV
1.5A Constant Current Buck Regulator for Driving High
Power LEDs
General Description
The LM3406/06HV are monolithic switching regulators de-
signed 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.
Features
â Integrated 2.0A MOSFET
â VIN Range 6V to 42V (LM3406)
â VIN Range 6V to 75V (LM3406HV)
â True average output current control
â 1.7A Minimum Output Current Limit Over Temperature
â Cycle-by-Cycle Current Limit
â PWM Dimming with Dedicated Logic Input
â PWM Dimming with Power Input Voltage
â Simple Control Loop Compensation
â Low Power Shutdown
â Supports All-Ceramic Output Capacitors and Capacitor-
less Outputs
â Thermal Shutdown Protection
â eTSSOP-14 Package
Applications
â LED Driver
â Constant Current Source
â Automotive Lighting
â General Illumination
â Industrial Lighting
Typical Application
© 2008 National Semiconductor Corporation 300203
30020301
www.national.com
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