LM3402 Reference Design - 6 InGaN White LEDs, 350 mA

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Design Specifications

Inputs	Outputs #1
VinMin=27	Vout1=20.6
VinMax=33	Iout1=0.35

Design Resources

LM3402 Reference Design

Additional Resources

•	LM3402 Product Folder
•	LM3402EVAL Evaluation Board

Bill Of Materials

Part	Manufacturer	Part#	Attributes
Cb	Vishay	VJ0805Y103KXXAT	10n F
Cf	Vishay	VJ0805Y104KXXAT	100n F
Cin	TDK	C3225X7R1H225M	NumCaps=1, 2.2u F
Co	TDK	C2012X7R1H105M	1u F
D1	Central Semiconductor	CMSH1-40M	0.5 V
L1	TDK	SLF10145T-151MR79	150u H, 0.35 Ohms
Ron	Vishay	CRCW08053093F	309k Ohms
Rsns	Panasonic	ERJ6BQFR56V	0.56 Ohms
U1	National Semiconductor	LM3402

Design Description

This circuit is designed to drive an array of six series-connected InGaN white LEDs (typical Vf = 20.4V total) at a continuous current of 350 mA from an input of 30V +-10%. Switching frequency is 500 kHz.

Schematic

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