TPD3S714-Q1: OVP for VD+/VD-

user4979899

Part Number: TPD3S714-Q1

Hi Sir,

Once external voltage shorting to data lines(VD+ or VD-)above OVP threshold is detected by IC, it shuts off its FET inside.
Above situation, VD+/VD- will connect to where inside IC? And will VD+/VD- draw current from external voltage?

over 4 years ago

0 Michael Tan over 4 years ago

TI__Expert 8420 points

Hi Anne,

When the OVP happen in the data line. The internal data switch between VD+/- and D+/- will be turn off to protect the D+/- side SOC system.

VD+/- internal is connect to data switch FET drain side.The VD+/- side high voltage will not draw current from external during OVP happen.

0 user4979899 over 4 years ago in reply to Michael Tan

TI__Expert 3080 points

Hu Michael,

Thanks for your feedback.

Customer is asking if there is a 18V spike from external as below.

Will VDP connect to GND and burn out USB filter(U61)PIN2-3 if U61.PIN2 shorts to external voltage over 18V?

0 Michael Tan over 4 years ago in reply to user4979899

TI__Expert 8420 points

Hi Anne,

No, the internal OVP FET will switch off in very short time typical about 200nS.

0 user4979899 over 4 years ago in reply to Michael Tan

TI__Expert 3080 points

Hi Michael,

Since customer is looking for the root cause why U61 pin2/3 will burn to short,

So need our help to clarify if TDP3S714-Q1 both Vbus_sys and Vin are off and there is a voltage input to U61 pin2 more around 12V,

Is there any possible that TDP3S714-Q1 pin5 VDP internal short to GND?

Thanks

0 Michael Tan over 4 years ago in reply to user4979899

TI__Expert 8420 points

Hi Anne,

The VDP internal is the ESD clamp ,the ESD current will go through the VDP to the ground once the VDP internal ESD clamp circuit be actived.

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TPD3S714-Q1: OVP for VD+/VD-