LM2577-ADJ quick check

Jonas Gruska

Other Parts Discussed in Thread: LM2577, LM2733

Hello everyone,

I was hoping some of you experienced designers could look at my circuit and check whether my calculations seem reasonable. It is my first time designing step-up converter, so just to be sure.

My goal is to generate 48V from 9V, as clean as possible (audio use), with maximum current 30mA. I know the lm2577 seems a bit of an overkill, but I haven't found any other solution yet.

I know the circuit will produce actually 50V, will work on that later - but that is not the critical part. I am particularly not completely sure about L, R(C) and C(C).

Thank you very much for any input on the circuit!

Jonas

over 11 years ago

0 Anston Lobo over 11 years ago

TI__Genius 16025 points

Hi Jonas,

We've received your request and will get back to you shortly.

Thanks,

Anston

0 Anston Lobo over 11 years ago in reply to Anston Lobo

TI__Genius 16025 points

Hi Jonas,

I'm attaching a schematic using the LM2733 to provide your boost circuitry. Since this part tops out at 40V, we implemented a Voltage doubler on the output that should serve you upto 80V output should you find the need.

This application schematic will improve not only your efficiency but the quality of your output as well. Keeping in mind the audio nature of this application, there is an RC low pass on the output to reject any high frequency switching noise.

8132.Boost with Doubler - E2E.pdf

Let me know if you have any questions.

Thanks,

Anston

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LM2577-ADJ quick check