LM3402 Reference Design - 3 InGaN White LEDs, 350 mA

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Design Specifications

Inputs	Outputs #1
VinMin=11.3	Vout1=10.1
VinMax=12.6	Iout1=0.350

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	Vishay	VJ0805Y334KXXAT	330n F
D1	Central Semiconductor	CMSH1-20M	0.5 V
L1	TDK	RLF5018T-220MR63	22u H, 0.16 Ohms
Ron	Vishay	CRCW08051273F	127k Ohms
Rsns	Panasonic	ERJ6BQFR51V	0.51 Ohms
U1	National Semiconductor	LM3402

Design Description

This circuit is designed to drive three InGaN WLEDs at a forward current of 350 mA with a peak-to-peak ripple current of 35 mA or less. The input is 12V +-5%, Vo = 10.1V, and the switching frequency is 600 kHz +-10%.

Schematic

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