# Power supply connected to multiple buck converters, input current requirements

I have a 24V/40A power supply with a foldback current limiter. And I need to connect 76 buck converters of 5V and 2A each to it. Since the current of the power supply is limited and considering that the input current of the buck converters is not constant, but has peaks.

Can the sum of the currents of the buck converters exceed 40A at any time?

In such a case, what happens to the output voltage when the current protector of the power supply acts?

• Do you understand how foldback current limiting works, in a general sense? Oct 28, 2022 at 15:17
• You should show a schematic of your buck converter and explain how much bulk capacitance you have in total. Oct 28, 2022 at 15:20
• If all buck converters are loaded fully, they need at least 79.2 % efficiency in order not to overload your 24 V supply. Do they? Oct 28, 2022 at 15:23
• @SteveSh If I exceed the current limit, the foldback limiter would reduce the voltage, causing the buck converter to increase the duty cycle, drawing more current, and so on until the power supply goes into hiccup mode, I think. Oct 28, 2022 at 15:42