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.

UCC21520-Q1: About ROHA/B and ROLA/B spec

Part Number: UCC21520-Q1

Hi,

Could you tell me the maximum and minimum of ROHA/ROHB and ROLA/ROLB ?
If it is difficult to specify the value, please tell me the reason.
And Please tell me how to check the maximum and minimum values by calculation or testing.



Best regards,
Yusuke


  • Hi, Yusuke-san,

    Unfortunately, we do not specify the values you are looking for.

    Here is the method we use to measure the values shown in the data sheet:

    Resistance measurements

    • Force VCC to 5V, VDD1 and VDD2 to 12V
    • Set INA and INB to 3.3V
    • Pull 10mA from the output pins
    • Measure VDD voltage
    • Measure voltages on output pins
    • Measure current on output pins
    • Calculate Vhi delta = VDD voltage – OUT voltage
    • Calculate ROH
    • Set INA and INB to 0V
    • Push 10mA into the output pins
    • Measure voltages on output pins
    • Measure current on output pins
    • Calculate ROL

    Let us know if you have further questions.