DIY constant current mosfet driver

bestsystem · Jul 19, 2012

I am planning to build a simple cree LED driver, the intended current is 250-300ma. I plan to use a single MOSFET (and a resistor), powered from a protected lithium ion cell, to drive a XP-G warm white LED. The MOSFET will probably be working in linear mode (no PWM) to ease design and size.
Will there be any concerns? Thanks for your hint.

sunny_nites · Jul 20, 2012

I've used MOSFETs to power lots of LED projects and lights. They work great!

The only think I would caution is that you want to install the MOSFET as the last component on your circuit. They are extremely sensitive to static discharge and adding the MOSFET last will make it less likely that it will be damaged while working on the rest of the circuit. Speaking from experience!

Datman · Jul 20, 2012

For that problem, you can first solder a Zener diode, then the mosfet with G connected to the K and S to the Anode. It will be protected during your work.

jeffosborne · Jul 20, 2012

Is the MOSFET circuit like the one on the left in this post? It is a tried & true method, but does require a .5 volt drop across the sense resistor.
http://www.candlepowerforums.com/vb...d-cyan-boost&p=3419062&viewfull=1#post3419062

Will you light be portable or fixed?

DIY constant current mosfet driver

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