Power adapter CY4532-EVK

[VaLi_4706876]

Hi, I use CY4532-EVK as a power adapter, I supply power to j2, connect it to macbook via typeC, and 20V pulses start, after a while it stabilizes and starts charging. Why are there 20V pulses at the beginning at the output?

[Abhilash_P]

Hi,

  Is it possible to share the waveform?

And can I please know if these pulses stops after the PD negotiation or is it independent of it?

Regards,

Abhilash P

[VaLi_4706876]

Hi, it does not depend on PD negotiation. I'll try to show the oscillogram later

[VaLi_4706876]

I measure on R8

[Abhilash_P · Accepted solution]

Hi,

   R5, R7, R8 and R9 are the resistors connected to gate of the provider FET. Please measure the output voltage on TP10 (Type C VBUS) to measure the bus voltage on Type C VBUS.

Please let me know if you have connected the oscilloscope probe to CH1. Since from the attached waveform graph, it is clear that the magnitude of the voltage is 5V (1V*5divisions).

Regards,

Abhilash P