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Question about dead time problem of TPS40170

Guru 19485 points
Other Parts Discussed in Thread: TPS40170, CSD18531Q5A, CSD18503Q5A, TPS40170EVM-597

Trouble is in the corresponding for TPS40170.

Please let me know about two point below of TP40170.

※Vin: 24V, Vout: 12V, Iout: 7.3A

 High side FET: CSD18503Q5A, Low side FET: CSD18531Q5A

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①Attached waveform is High-side and Low-side FET switching.

 I feel that dead time is narrow.

 Is there way to expand deadtime for change external component? 

 (Customer is not want to change FET)

※Brown: Vin, Green: Low Gate, Blue: SW, Red: High Gate

②About TPS40170EVM-597, Low side FET's Gate is connect 1000pF capacitor(C20).

 Is C20 capacitor have what effect?

 I think that C20 part is increase Gate capacitance for Low-side FET, is it correct?

 (Increase Gate capacitance ⇒ expand deadtime)

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Best regards,

Satoshi