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What would be some limiting factors for high power DC/DC boost converters

I am looking into designing a custom boost converter for a project of mine.

I need a PSU for an audio amplifier that can convert battery power (21V to 27V) into 36V with peak power output of around 620W (17.2A)

I chose a LTC3787 PolyPhase Synchronous Boost Controller for this task, but I am not sure if I should use 1 or 2 of the IC's (so 2 or 4 phases) for this.

What would the most common limitations for 2 phase design? Thermals? Stability?


  • Hello

    Having more phases in your system generally needs smaller parts and distributed thermals on your application.

    Having more phases would also introduce complicity on your board maintaining balance on all phase and reducing noise pick up.

    I would suggest using LTpowercad to see what you need on your application. it will also show you if you need only 2 or 4 phases