Is it possible -15V/2A with MC33063?

[endorfin35+]

Hi everyone,

I'm not experienced in this matter. I want to generate -15V from +24V. I prepared the drawing attached. I'd like to hear your ideas.

[Terry Bites]

Yes.
You can make an inverting buck converter. See  9.2.1 and 8.2.1.2 in the datasheet. www.ti.com/lit/gpn/mc33063a

The calculations are simple but a bit tiedious. My advice, do the calculations in excel or other spreadsheet so you can tweak your design.
Or....
https://observablehq.com/@sharow/mc34063-inverting-conveter-calculator
The mc34063 is essentially the same as the mc33063, the only difference is an improved operating temperature range.
I asked our robot overloards gptchat: "Design an inverting buck converter with an MC33063. 24 volts input, -15 volts output"
Reply... https://chat.openai.com/share/9bb4bb18-c3e0-4b2a-b7c3-25e9f767c509 MFSOAB

[endorfin35+]

The calculator was very useful. Thanks for this.

The thing that caught my attention is that for 2A current, 7.6A peak current occurs. That's a pretty high value.

On the board referenced, I see only one integrated circuit, one diode and one inductor for this task. It is not clear what the ic is. However, its structure looks simple.