TPS53659: TPS53622A TPS53659 switching frequency

Mason Liu

Part Number: TPS53659
Other Parts Discussed in Thread: TPS53622A

Hi,

Is there any updated min/max frequency for the Fsw in TPS53622A TPS53659 datasheet?

In my customer design, he sets the Fsw to 600kHz in config file, but the measured frequency is ~750khz at heavy condition, is that reasonable?

Thanks.

Mason

0 Chasel Chen over 4 years ago

Hi Mason,

In terms of TPS53622A, close loop frequency controlled is not enabled, so it is normal you will see Fsw increased in heavy load.

TPS53659 is with close loop frequency controlled enabled, so the Fsw variation regarding the load is very small.

Thanks

Chasel

0 Mason Liu over 4 years ago in reply to Chasel Chen

Hi Chasel,

Do we have a formula to estimate Fsw vs load?

Thanks.

Mason

0 Chasel Chen over 4 years ago in reply to Mason Liu

Hi Mason,

There is no formula for this

Chasel

0 Mason Liu over 4 years ago in reply to Chasel Chen

Hi Chasel,

just want to confirm, is 750kHz still in desired Fsw range?

Thanks.

Mason

0 Chasel Chen over 4 years ago in reply to Mason Liu

Hi Mason,

Yes, it is, that is the reason why no max/min Fsw per settings in the datasheet. It is varied.

Thanks

Chasel

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