LM3402HV Reference Design - 12 InGaP LEDs, 360 mA

Design Specifications

Inputs	Outputs #1
VinMin=47	Vout1=40.2
VinMax=49	Iout1=0.360

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	C3216X7R2A334M	330n F
D1	Central Semiconductor	CMSH1-60M	0.5 V
L1	TDK	SLF10145T-151MR79	150u H, 0.35 Ohms
Ron	Vishay	CRCW08052004F	2M Ohms
Rsns	Panasonic	ERJ6BQFR68V	0.68 Ohms
U1	National Semiconductor	LM3402HV

Design Description

This demonstration circuit is designed to drive a string of 12 InGaN LEDs (Vf total about 40V) at a forward current of 360 mA +-3% with a peak-to-peak ripple current of 40 mA or less. The input is 48V +-2%. Switching frequency is 200 kHz +-10%.

Schematic

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