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Cree XB-D driver circuit Answered

Hi Everyone,

I would use following design with some modifications to be able to drive 3x3 Cree XB-D LEDs Green/Blue:

https://www.instructables.com/id/Circuits-for-usin... Step 8 #4

I would use 12V ATX computer PSU as voltage source.

PWM source: Arduino nano

Attached picture show how I modified the design: 3x3 LED setup

My main concern, is it correct my calculation of LED currents: based on my understanding, 220mohm current sense resistor setup 2,272A current through FET. Based on Kirchhoff's current law, it will be 757mA for 1 LED.

Is that correct?

Any advise and suggestion would highly welcome.


Best Regards,



The forums are retiring in 2021 and are now closed for new topics and comments.

2 years ago

Honestly, I do not know. But you should try asking this question under the Question and Answer section on the project you are referencing.