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How control feedback of LM2576 from MCU?

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Astrid

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Hello,
I have circuits with step-down LM2576HVT see picture. (power supply for inductive heater). New idea is use this circuits also as power supply for resistive heater.
MCU disconnect Out 5-48V and FB (make off HF switching transistor)
Left to invent, detachable feedback that output switches to Output 34V and 40V turbo mode on.
Requirements, simple, cheap, occupying a small area, controlable from MCU and in normal mode, not influencing the simplified circuits in Figure
LM2576.png

I welcome every idea.
 

Just a thought.
Use analog switch any as ADG721 and
and connect / disconnect the resistive divider.
resistance values ​​are approximate
What do you think?
1.png
 

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