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TPS259230-41EVM: cannot work properly when replaced with TPS259270

Joe Ji
Intellectual 2395 points
Part Number: TPS259230-41EVM

Hi Team

customer is validating the TPS259270 with TPS259230-41EVM, there are two issues reported:

1. When soldering different pcs of TPS259270 to the EVM, the I_limit performance is different varies between 3.8A to close to 5A

2. It makes no differences of I_limit when changing the resistor connected to ILIM pin.

Is there anything should be paid attention to make the EVM run properly?

Thank you

best regards!

Joe

  • 0
    TI__Guru** 102711 points

    Hi Joe,

    What is the input test voltage ?

    Have you replaced U1 or U2 with TPS259270  ? Please use resistive load or e-load in CR mode for evaluation. 

    Can you test waveform of VIN, EN/UVLO, Vout and Iout

    Best regards,

    Rakesh

  • 0 in reply to Rakesh
    TI__Intellectual 2395 points

    Hi Rakesh

    Thanks, but why the test load can only use resistive load or e-load in CR mode? customer use CC mode in the test.

    Best regards

    Joe

  • 0 in reply to Joe Ji
    TI__Genius 16325 points

    Hi Joe,

    (I will take over the support from Rakesh)

    When we perform current limit test, the internal FET goes into saturation region and act like a constant current source. When you apply a CC load, that is like connecting 2 current sources in series which creates error in test.

    Instead, we recommend using CR mode of e-load. This prevents that issue.

    Did they try regular start-up. Is the device starting up fine? Also please check with the customer regarding these questions

    Rakesh said:

    What is the input test voltage ?

    Have you replaced U1 or U2 with TPS259270  ? Please use resistive load or e-load in CR mode for evaluation. 

    Can you test waveform of VIN, EN/UVLO, Vout and Iout

    Best Regards,
    Arush