Step up converter again

or a wireound SM part.

depends how big it is or did u mean to say through hole type ?

Colin =^.^=

How much AC voltage and current are you putting on the inductor?

Whats the coverter frequency?

Whats the DC component of the induictor current?

they are not exclusive! if you like you may specify a certain xx.xx uH, @ fmax and @ Imax, as well as pick the size, form and factor. All real-world inductors are wire wound upon something. IN smd pack the mu metal is designed into standard smd footprints. OR, you can obtain the inductance in a leaded part, in fact you may obtain radial or axial leeded inductors for your use.

Best regards and happy designing

marc

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Yes.

No.

Maybe.

Both.

Many surface-mount inductors are wirewound. But inductor size tends to go as the amount of energy you're storing in them (among other things), and the amount of energy you're storing in them goes up with your supply's power capabilities, down as your supply's frequency goes up, and can be pulled up or down with other features of your supply design.

First understand what you're doing.

Then determine the min & max currents in your inductor.

Then determine the voltage swing in your inductor.

Then determine your frequency.

Then go shopping.

--
Tim Wescott
Control systems and communications consulting
http://www.wescottdesign.com

Need to learn how to apply control theory in your embedded system?
"Applied Control Theory for Embedded Systems" by Tim Wescott
Elsevier/Newnes, http://www.wescottdesign.com/actfes/actfes.html

That's not easy when one's understanding of analogue electronics is limited. The frequency will be several hundred kHz. Derived from a timer counter after experimentation with pwm to get the voltage right. Current is 5mA nom,

10 mA max, to drive a self oscillating piezo for 70mS every 300mS. I guess suck it and see.... seems like there is no reason I can't use something in a 1206 @ 20uH or so from the replies above.