Re: Electroluminescent LCD backlight
What is the rated current of your load?
The inductors presented in this thread are just RF chokes and not intented for SMPS circuit use.
If the inductor is saturated you may just burn the mosfet or the inductor itself.
ON time, Vcc, MOSFET On resistance, Inductance and Inductor resistor are the factors to consider for the current through the inductor.
Simple circuit but lots of math behind it.
An oscilloscope is a must for the checks.
Also, if you change places between MOSFET and Inductor and reverse polarity of the Diode, you can drop the second MOSFET. Just the polarity of Vout would be inverted.
Ioannis
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