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TPS2595EVM: Waveform question

Patrick Chen
Mastermind 8875 points
Part Number: TPS2595EVM
Other Parts Discussed in Thread: TPS2595

Hello

           Customer connect to DUT and test 19Vin. The waveform looks abnormal as below. Does the chip enter thermal cycle protection or any others root cause? Thank you. 

BR

Patrick

BR

Patrick

  • 0
    TI__Guru 57737 points

    Hi Patrick,

    The first point to note here is the device is recommend to operate only up to 18 V. 

    How is 19V stepped down to 5V ? I dont see any Buck Converter/LDO at the output of TPS2595. 

    Did you check the same circuit by disconnecting the DUT and test with an resistive load ? This will help us understand if load is causing this kind of behavior. 

  • 0 in reply to Praveen GD
    Mastermind 8875 points

    Hello 

                Could you help see below customer testing waveform add current channel? It looks not thermal cycle to cause this phenomenon. has any comments for it? Thank you. 

    BR

    Patrick

  • 0 in reply to Patrick Chen
    TI__Guru 57737 points

    Hi Patrick,

    Can you please specify at what conditions you have captured these waveforms. Also, please clarify which signals are captured in the snapshots.

    Vin seems to be at 12V and Vout2 seems to be at 5V. This means there is a 15V drop across the FET and some current flowing through it. This power loss across the FET can cause Thermal Shutdown. To verify if this is a thermal shutdown you can probe the Fault signal as well. .

    Table 2 in the datasheet gives you the conditions when fault is asserted. Fault signal asserts for Thermal Shutdown.