• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 62 subscribers
  • Views 1006 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS563210A: How to calculator OCP point?

Evan Wang
Genius 11400 points

Part Number: TPS563210A

Hi All,

I want to calculate the real OCP current, but the datasheet only provide the OCL part.

After checking the datasheet, the OCP current will be (IOCL + 1/2*ILripple).

But I wonder how the OCL current is measured?

1-1.Is the OCL current measured by the low side VDS during On state(From datasheet)?

1-2.Or it is measured by high-side and use (Vin - Io * D * ( Rdson ( high-side ) ) =VDS(low side)?

2. If 1-1 is correct, can assume the IOCL is equal to Io*D?

Thank you for your help.

Best Regards

Evan

  • 0
    TI__Genius 12970 points

    Hi,

    TPS563210A is a DCAP2 control devices , that means that the OCP function is using  a cycle-by-cycle valley detect control circuit. 

    The switch current is monitored during the OFF state by measuring the low-side FET drain to source voltage. This voltage is proportional to the switch current.

    You can refer below pic about OCP .

    and due to this spec is a fixed value inside . You can check the valley of loading current if can trigger OCP.

    And you can get the OCP data by short test (short Vout to GND) to enter hiccup mode and measure the valley current .