SN6507: SW1/SW2 undershoot

Gilles Lopez

Prodigy 20 points

Part Number: SN6507

On my prototype I observe undershoot at SWx outputs: About-700mV / 30ns

From datasheet, Absolute Maximum Ratings table, the minimum value is not defined for SW1, SW2 outputs.

Could you give me this value?

Are negative undershoot are acceptable?

10 months ago

0 Andrew Jackiw 10 months ago

TI__Mastermind 20185 points

Hello Gilles,

Thank you for reaching out. I suspect this level of undershoot and ringing would be fine. If you have any scope captures or waveforms, please share them.

We will review and a team member will get back to you tomorrow.

Best,
Andrew

0 Gilles Lopez 10 months ago in reply to Andrew Jackiw

Prodigy 20 points

Here is a capture

+1 Koteshwar Rao 10 months ago in reply to Gilles Lopez

TI__Guru 53715 points

Hi Gilles,

Thank you for sharing the scope shot. As Andrew stated, this shouldn't be a concern. Such ringing could happen due to parasitic inductance created by the traces between device and transformer. It can be improved by optimizing the PCB layout and/or by using an RC snubber between SW and GND pins of SN6507.

Let me know if you have any further questions, thanks.

Regards,
Koteshwar Rao

Isolation

Isolation forum

SN6507: SW1/SW2 undershoot