What happens to a power converter when the load microprocessor is overclocking

Hi All, I see some PWM controller's datasheet is featured to be applied in overclocking applications of the micro processor, such as https://www.infineon.com/dgdl/pb-ir3580.pdf?fileId=5546d462533600a401535680583628f7 . Would anybody tell me what is the requirements or challenges to the power converter when the load processor is overclocking?

I just know the operating frequency of the processor will speed up when it is overclocking. However, from the pespective of the power converter, what happens to its load conditions?

Thank you!

Microprocessor consumes more power during over-clocked operations.
Probably the PWM controller increases its duty cycle to tackle the power requirement during over-clock.

I haven't went through the datasheet attached by you (just read the description)
Though replied so that you can catch-up something better from this.

bala0x07 said:

Microprocessor consumes more power during over-clocked operations.
Probably the PWM controller increases its duty cycle to tackle the power requirement during over-clock.

I haven't went through the datasheet attached by you (just read the description)
Though replied so that you can catch-up something better from this.

Click to expand...

Hi bala0x07, thank you! Does your statement "Microprocessor consumes more power during over-clocked operations" means the load current will need to increase with the unchanged Vout, or it requires the Vout to change as well?
In addition, is it more challenging for the transient response when the same processor operates in overclocking instead of normal condition?
The datasheet does not include any detailed information of the overclocking requirements. It is only saying this controller can be used for overclocking applications. Therefore, I am curious, what feature should a controller have, to make the converter be able to accomodate the overclokcing requirement.

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bala0x07 said:

Microprocessor consumes more power during over-clocked operations.
Probably the PWM controller increases its duty cycle to tackle the power requirement during over-clock.

I haven't went through the datasheet attached by you (just read the description)
Though replied so that you can catch-up something better from this.

Click to expand...

Hi bala0x07, thank you! Does your statement "Microprocessor consumes more power during over-clocked operations" means the load current will need to increase with the unchanged Vout, or it requires the Vout to change as well?
In addition, is it more challenging for the transient response when the same processor operates in overclocking instead of normal condition?
The datasheet does not include any detailed information of the overclocking requirements. It is only saying this controller can be used for overclocking applications. Therefore, I am curious, what feature should a controller have, to make the converter be able to accomodate the overclokcing requirement.

Many modern PC processors have an adaptive core voltage, simply assume that the core voltage need to be raised to allow operation at a higher clock frequency.

C*V*f current will increase (for f, and as mentioned perhaps
V as well). Hopefully there remains some margin against the
PSU's current limit setting. However this comes down to
cases, and cheap hardware probably has most of its margin
"squoze out" (overclocking is the attempt to push hardware
past its designed limits which may include any remaining
supply current margin).


The clock frequency will be way outside the PSU's bandwidth
in both as-shipped and overclocked cases, taken care of by
the output filter and local decoupling.

Hi bhl3302,

Actually it is both voltage and current.
It is simply evident in all microcontroller or processor datasheet.

Every micro datasheet will provide a relationship between clock frequency vs supply voltage.
If you have a look into that, the required supply voltage increases with clock frequency.

For ex:
If a microcontroller datasheet recommends 5V for 16 MHz, but you operate the microcontroller with a 3.3V supply, then it deviates from the 16MHz and operate much lesser than that if you push the controller to operate at that frequency.
Then you have to do all oscillator calibration works to tackle that, but even though you cant do much compensation works.

Also if you analyse the current consumption of a processor, at higher voltage it consumes more current, This is true to all processors.

You don't want to do in depth power analysis, since it can't be accurately done without a power analyzer, but this finds its way to be a fact