LM3402HV Reference Design - 1 InGaN LED, 350 mA

Design Specifications

Inputs	Outputs #1
VinMin=6	Vout1=3.5
VinMax=75	Iout1=0.350

Design Resources

LM3402HV Reference Design

Additional Resources

•	LM3402HV Product Folder
•	LM3402HVEVAL Evaluation Board

Bill Of Materials

Part	Manufacturer	Part#	Attributes
Cb	Vishay	VJ0805Y103KXXAT	10n F
Cf	Vishay	VJ0805Y104KXXAT	100n F
Cin	TDK	C3225X7R2A105M	NumCaps=1, 1u F
Co	TDK	C3216X7R2E225M	2.2u F
D1	Central Semiconductor	CMSH1-100M	0.5 V
L1	TDK	SLF10145T-151MR79	150u H, 0.2 Ohms
Ron	Vishay	CRCW08051303F	130k Ohms
Rsns	Panasonic	ERJ6BQFR68V	0.68 Ohms
U1	National Semiconductor	LM3402HV

Design Description

This LM3402HV circuit and BOM have been designed to provide a constant forward current of 350 mA to a single LED with a forward voltage of approximately 3.5V. (Typical of white, blue, and green LEDs using InGaN technology.) When powered from a 48V +-5% input the circuit will maintain the average LED current to within 10% of 350 mA. The ripple current will not exceed 70 mA peak-to-peak. Switching frequency for this design is 250kHz +-10% when the input is 6V to 75V.

Schematic

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