Boost circuit

[pushpa]

i need a boost circuit to boost 14 V to 24 V.........

regard's
Pushpa

 

[mvs sarma]

Perhaps you need to mention the load current. However ON semi's AN920 deals with many such converters adopting MC34063A. That is really a good chip. One such power supply design can be found on elektor UK magazine and / or EPE magazine of UK as an application for laptop power supply from 12V DC input.

 

[pushpa]

hi,
thanks for reply......
i am trying to build my owm circuit ......
but i am confused.....

i am trying to build circuit using inductor(52uH), diode(1N5408), mosfet(IRFZ44N) & a capacitor of 4.7uF...... normal Boost circuit.......
feeding signal from atmega controller of 20KHz,50% duty cycle of 12V

 

[carbonzit]

What are you confused about?

Those parts sound like what you might use to make a working boost converter, but of course it all depends on how they're connected, doesn't it?

Have you looked at the Atmega datasheets or application notes?

Got a schematic you can post?

 

[pushpa]

What are you confused about?

Those parts sound like what you might use to make a working boost converter, but of course it all depends on how they're connected, doesn't it?

Have you looked at the Atmega datasheets or application notes?

Got a schematic you can post?

actually i am directly from driver circuit feeding pulse to mentioned mosfet gate ....... if i try to do so ciruit is getting shorted......

 

[4pyros]

You need two diodes for a voltage doubler circuit.
Look here to start;
http://www.interfacebus.com/Glossary-of-Terms-Voltage-Quadrupler.html

 

[mvs sarma]

@pushpa,
calculate the impedance offered by the 52uH, (unsaturated) at 20KHz. i fear you have to either increase frequency or the inductance. lower inductance would be like short circuit during the ON period of the pulse.