LM3414 datasheet(1/20 Pages) NSC

Part #	LM3414

Description	1A 60W* Common Anode Capable Constant Current Buck LED Driver Requires No External Current Sensing Resistor

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Manufacturer	NSC [National Semiconductor (TI)]

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LM3414/LM3414HV

August 9, 2010

1A 60W* Common Anode Capable Constant Current Buck

LED Driver Requires No External Current Sensing Resistor

General Description

The LM3414 and LM3414HV are 1A 60W* common anode

capable constant current buck LED drivers. They are excep-

tionally suitable to drive single string of 3W HBLED with up to

96% efficiency. They accept input voltages from 4.5VDC to

65VDC and deliver up to 1A average LED current with ±3%

accuracy. The integrated low-side N-channel power MOSFET

and current sensing element realize simple and low compo-

nent count circuitry as no bootstrapping capacitor and exter-

nal current sensing resistor are required. An external small-

signal resistor to ground provides very fine LED current

adjustment, analog dimming as well as thermal fold-back

functions.

Constant switching frequency operation eases EMI. No ex-

ternal loop compensation network is needed. The proprietary

Pulse-Level-Modulation (PLM) control method benefits in

high conversion efficiency and true average LED current reg-

ulation. Fast response time realizes fine LED current pulse

fulfilling the 240 Hz 256-step dimming resolution requirement

for general lighting.

The LM3414 and LM3414HV are available in ePSOP-8 and

3mm x 3mm LLP-8 packages.

*Thermal de-rating applies according to actual operation con-

ditions

Features

■ Support LED power up to 60W*: 18x 3W HBLEDs

■ Requires NO external current sensing resistor

■ ±3% LED current accuracy

■ Up to 96% efficiency

■ High contrast ratio (Minimum dimming current pulse width

<10 µS)

■ Integrated low-side N-channel MOSFET

■ Adjustable Constant LED current from 350mA to 1000mA

■ Support analog dimming and thermal fold-back

■ Wide input voltage range:

4.5V to 42V (LM3414)

4.5V to 65V (LM3414HV)

■ Constant Switching Frequency adjustable from 250 kHz to

1000 kHz

■ Thermal shutdown protection

■ Power enhanced ePSOP-8 or 3mm x 3mm LLP-8 package

Appications

■ High Power LED Driver

■ Architectural Lighting, Office Troffer

■ Automotive Lighting

■ MR-16 LED Lamp

Simplified Application Schematic

30124801

301248

www.national.com

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LM3414 Datasheet(PDF) 1 Page - National Semiconductor (TI)

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