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I am looking for a faster way to control output voltage for a buck converter. This buck converter has its own fet driver and I am not willing to change it. I really only need the signal to run the gate driver.

A little about the project

60 khz

0-100 percent duty cycle

voltage adjustment 0-5v , my MCU will be making adjustments to the "target voltage" that I need something to aim for. For various reasons I can only use an analog 0-5v out to make these adjustments, digital wont work.

current limiting, would be nice, but not necessary.

600 volt input about 350v output

I am currently using the arduino to figure out duty cycle, but would like another way to figure out the duty cycle so the arduino only has to set the target voltage instead of trying to monitor current ect.

Still on the fence if the next version will be low or high side, if it matters I can go either way.

How should I go about this?

Or am I better off building it out of a big mess of timers and op amps

enter image description here

Any advice greatly appreciated

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  • \$\begingroup\$ Please pose this question as a design question. \$\endgroup\$
    – Voltage Spike ♦
    Commented Jan 18 at 4:41
  • \$\begingroup\$ please also write a title which accurately summarises your question \$\endgroup\$
    – danmcb
    Commented Jan 18 at 6:31
  • \$\begingroup\$ That's an impressive piece of equipment !!! \$\endgroup\$
    – Russell McMahon ♦
    Commented Jan 18 at 6:51
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    \$\begingroup\$ You are trying to do some things in ways whose reasons are uncertain and which may be suboptimal. It would help if you can provide an overall circuit diagram AND a complete specification of the aims. ie the level of detail that you would have needed to attempt to design this. // The suggestion "big mess of timers and opamps" indicates that you may not have a good feel for the potential severity of such a task and the capabilities than an appropriate IC can give. || By no means complete questions. Why decication to specific gate driver, and what is it? Why 60 kHz . Power? More ...? \$\endgroup\$
    – Russell McMahon ♦
    Commented Jan 18 at 6:51
  • \$\begingroup\$ Some more information on your control method and why it's not performing the way you want it to might also help. Is it current or voltage mode controlled? You implied it's current mode controlled but it's worth asking to verify. What is the crossover frequency of your controller? Any other info you can share would help. \$\endgroup\$
    – Ryan
    Commented Jan 18 at 6:55

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