WEBENCH® Tools/MC34063A: .

divyanshu bawa

Part Number: MC34063A
Other Parts Discussed in Thread: TPS62177

Tool/software: WEBENCH® Design Tools

Hello sir,

Sir, I just want to use MC34063A IC for generating the output voltage as 3.3v and 5v If it can generate both at different points its good otherwise 5v will be fine I will regulate it. But i couldn't found any schematic at webench . So can u please help me out in this.

I need it very urgent for my product

Thank you

over 7 years ago

0 Jasper Li over 7 years ago

TI__Mastermind 46905 points

hi
there is no webench model for this device. you can refer to page 15 and 16 to design a BUCK circuit.

please note that there are many other buck solutions which is much better than MC34063A and easy to use.

0 divyanshu bawa over 7 years ago in reply to Jasper Li

Expert 1325 points

hi Sir,

Actually i can get better option but they are not cost efficient. I want buck boost as cheaper as i can.

so can u please help me to get the schematic for the same.

Thank you

0 Jasper Li over 7 years ago in reply to divyanshu bawa

TI__Mastermind 46905 points

you can refer to Figure 11 for the 5V output voltage schematic. you can change the R1 and R2 to get 3.3V output.
what is the input voltage and output current?

0 divyanshu bawa over 7 years ago in reply to Jasper Li

Expert 1325 points

HI
MY INPUT VOLTAGE IS 24V
Output current :- 1amp is enough.

can i get both 3.3v and 5v from this circuit...???

thank you

0 Jasper Li over 7 years ago in reply to divyanshu bawa

TI__Mastermind 46905 points

i don't think so. you can only get 5V or 3.3V with one MC34063A.
1A is too high for this device. the output capacitor is approximately 500mA.

0 divyanshu bawa over 7 years ago in reply to Jasper Li

Expert 1325 points

hi Sir,

IF i use TPS62177 to get 3.3v and 5v both from one ic. what changes are need to be done in schematic.

www.ti.com/.../tps62177.pdf

Thank you

0 divyanshu bawa over 7 years ago in reply to divyanshu bawa

Expert 1325 points

Hi Sir,

Waiting for your reply..

Thank you

0 Jasper Li over 7 years ago in reply to divyanshu bawa

TI__Mastermind 46905 points

Hi
refer to this article to generate two output with single BUCK. or you can try one buck to 5V and a LDO to 3.3V
www.digikey.com/.../generating-multiple-outputs-from-a-single-synchronous-buck-converter-is-simple

i'm not familiar with BUCK device. i don't know which device is the best solution. could you start a new post with title like "a single buck device to generate 5V and 3.3V"? There are BUCK device expert to help you.

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WEBENCH® Tools/MC34063A: .