Electroluminescent LCD backlight

[Ioannis]

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

[Demon]

This was my first foray into this sort of circuitry. I was just looking for something to light up these LCDs and that was the only circuit I could find.

If you can draw a better schematic to do this, I'd really appreciate it. Giving details on the parts needed would also be a huge help.

In other words, assume you are talking to a 10 year old.

[mister_e]

in other words, assume you are talking to a 10year old.

*chuckle* At least you got some experience lately

[Demon]

*chuckle* At least you got some experience lately

You're only a 30 minute drive from here and don't forget I can run faster than you, even with my walker. :P lol

[rmteo]

An excellent source of information (technical as well as pricing) on power inductors etc. http://www.coilcraft.com/

[Demon]

What is the rated current of your load?
...

Googling for PC-016ATE, I made my way here via Wombat:
http://www.serialwombat.com/parts/LCD-107.pdf

mArms=2.9

Also got more information on what we should aim for:

Vrms=100
fEL=400Hz

[Demon]

This circuit is interesting:
http://www.simplecircuitdiagram.com/...mple-inverter/



I just wouldn't know what to try as transformer to go from 5vdc to 100vac, nor how to control frequency at 400Hz.

I don't have many transformers on hand to fry.

[shahidali55]

Try this and let me know how it works out.