• Resolved

TPS65987D: Does FW OCP works for 9V/15V/20V?

Intellectual 990 points

Replies: 3

Views: 78

Part Number: TPS65987D

Hi,

We would like to know if TPS65987DDH has FW OCP (overcurrent protection) for 9V/15V/20V. 

Based on the app notes http://www.ti.com/lit/an/slva994/slva994.pdf, it mentioned 5V examples but there are no 9V/15V/20V examples. Inside the app note, it also mentioned that Overcurrent Clamping is only implemented when the TPS65987DDH is sourcing 5 V on VBUS.

Our customer set the source capabilities setting of 15V 3A 150% peak current. When connected to one PD Sink A, the cutoff (FET open) current was 4.6A, and when connected to another PD sink B, the cutoff current was 5.5A. Do you know why there is difference in the cutoff current when using the same 987DDH device?

Thanks.

Gim Song 

  • Hello Gim,

    Yes the TPS65987D will provide FW OCP during a high voltage contract, not just for 5V. Within that same app note, it explains this as well as within the datasheet. Hope this helps answer your question. 

    Regards,

    Adam McGaffin

  • In reply to Adam Mc Gaffin:

    Hi Adam,

    Appreciate your clarification that FW OCP works for higher voltage contract. This is helpful. I have 2 questions here.

    1) Based on Table 1. IOCC Programmable Settings for Overcurrent Clamp Point, can I say that 150% Peak Current settings gives the min 4.5A, typ 5A and max 5.5A for 15V/3A setting on Transmit Source Capabilities?

    2) Our customer set the source capabilities setting of 15V 3A 150% peak current. On the same 987DDH device, when connected to one PD Sink A, the cutoff (FET open) current was 4.6A (continuous current); and when connected to another PD sink B, the cutoff current was 5.5A (continuous current). Do you know why there is different cutoff current when using the same 987DDH device?

    Thanks.

    Gim Song

  • In reply to Gim Song:

    Hi Adam,

    After demonstrating our FW OCP settings using TPS65987EVM and USB-C-PD-DUO-EVM, it is showing that the current clamping (MOSFET is disabled) works with 100% Peak and 150% Peak settings. This case is closed with the customer.

    Thanks for your support on this.

    Gim Song