Dc To Dc Converter

[mostafa zaky]

Please I Need Help
I Need To Make Step Up For 12 V Dc
To Be 24 Or 18 V Dc
I Need A Dc To Dc Converter Circuit
To Perform That Task
Such As That Circuit
But I Can`t Find That
Op_amp Lm 2577

 

[ericgibbs]

Please I Need Help
I Need To Make Step Up For 12 V Dc
To Be 24 Or 18 V Dc
I Need A Dc To Dc Converter Circuit
To Perform That Task
Such As That Circuit
But I Can`t Find That
Op_amp Lm 2577

hi,
the LM2577 is not a op amp, its a voltage regulator, see this pdf.

 

[Hero999]

Thet will work, just cahnge the divider ratio to give 18V or 24V.

You could use a jumper or switch to change the voltage.

 

[mostafa zaky]

thanks all
but the problem here that i couldn't
the LM2577 in any shop that sells
electronic components
are there any regulator that can perform
the same task?
can i use LM317?

 

[Hero999]

The LM317 is a linear regulator (step-down only), you need a step-up switching regulator.

I would suggest looking on the Internet.

 

[MRubenzahl]

General advice for DC to DC supplies. We (Maxim) have a nice DC-DC tutorial among our applications notes:

**broken link removed**

and there's a "Power Supply Cookbook" with ready-to-go designs:

**broken link removed**

We also have a design tool called EE-Sim and National has their WebBench, both of which create and simulate circuits.