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.

LM51571-Q1: Ibias current

Part Number: LM51571-Q1

Tool/software:

Hi team,

My customer is evaluating LM51571-Q1 in their project and meet below issue, could you please help give some comments? Thanks.

Below are their test results:
(1) When VSUPPLY=12V, BIAS=3.3V, IBIAS=0.9mA,
(2) When VSUPPLY=2.1V, BIAS=3.3V, IBIAS=9.9mA
But the IBIAS spec on the datasheet is  ≤ 0.775mA, now the actual test does not match with the datasheet spec.

May I ask what the current of IBIAS is related to? The customer needs IBIAS <1mA when SUPPLY=2.1V, BIAS=3.3V.

Regards,

Ivy

  • Hi Ivy,

    Thanks for reaching out.

    The test conditions for the given Ibias are VFB=VREF. This means the device is not switching. The Bias current will be higher of course, when the device switches.

    Under what conditions did they see the 9.9mA?

    Best regards

    Moritz