LM3406_09 Datasheet, PDF (1/26 Pages) National Semiconductor (TI) – 1.5A Constant Current Buck Regulator for Driving High Power LEDs

LM3406/06HV
August 21, 2009
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
■ ^{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}
■ ^{eTSSOP-14 Package}
Applications
■ ^{LED Driver}
■ ^{Constant Current Source}
■ ^{Automotive Lighting}
■ ^{General Illumination}
■ ^{Industrial Lighting}
Typical Application
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