Hi All.
Im trying to build a circuit where I want to power a Cree XLamp XP-L LED at 1000Mah. Using a single cell (3.0-4.2V) Lithium battery.
I have written a small piece of code to produce a PWM output from a picaxe and switch on and off an N-Mosfet. However the most I can get is to draw around 400mAh of current. I have used a IRLD120 N channel mosfet.
There is probably something quite obvious I am doing wrong but in theory should this work? The idea comes from a couple of Chinese bike Lights I have stripped that appear to use a pic and a mosfet to control current to the LED. However the mosfets they use are usually unavailable in the UK or unmarked and so I cant see the details.
Any help is very much appreciated as I can not see why I can not get the current upto 1000mAh.
Thanks
JPU
NOTE: Even when the circuit is powered with a bench top power supply at 5V, I can not get the current draw above 400mAh
Im trying to build a circuit where I want to power a Cree XLamp XP-L LED at 1000Mah. Using a single cell (3.0-4.2V) Lithium battery.
I have written a small piece of code to produce a PWM output from a picaxe and switch on and off an N-Mosfet. However the most I can get is to draw around 400mAh of current. I have used a IRLD120 N channel mosfet.
There is probably something quite obvious I am doing wrong but in theory should this work? The idea comes from a couple of Chinese bike Lights I have stripped that appear to use a pic and a mosfet to control current to the LED. However the mosfets they use are usually unavailable in the UK or unmarked and so I cant see the details.
Any help is very much appreciated as I can not see why I can not get the current upto 1000mAh.
Thanks
JPU
NOTE: Even when the circuit is powered with a bench top power supply at 5V, I can not get the current draw above 400mAh