LM3402HV Reference Design - 7 InGaP LEDs, 360 mA

Design Specifications

Inputs	Outputs #1
VinMin=60.0	Vout1=23.3
VinMax=74.0	Iout1=0.35

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	C4532X7R2E225M	NumCaps=1, 2.2u F
Co	TDK	C3216X71E104M	100n F
D1	Central Semiconductor	CMSH1-100M	0.5 V
L1	TDK	SLF10145T-221MR65	220u H, 0.47 Ohms
Ron	Vishay	CRCW08054553F	453k Ohms
Rsns	Panasonic	ERJ6BQFR68V	0.68 Ohms
U1	National Semiconductor	LM3402HV

Design Description

This circuit is designed to drive a string of 7 InGaN LEDs (Vf total 23.1V) at a forward current of 350 mA +-5% with a peak-to-peak ripple current of 70 mA or less. The input is 67V +-10%. Switching frequency is 450 kHz +-10%.

Schematic

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