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TPS50601-SP: TPS50601KHK/EM obtaining strange results for lower frequencies

Part Number: TPS50601-SP

Bode plot seems to give proper results at around 115KHz but once i reach lower frequencies around 104KHz there is a phase wrap and an unexpected peak on the gain. my input voltage is 3.351V and output current is 0.894A. my switching frequency varies from 100.3KHz to 150KHz. I am wondering if this is the way the part should be behaving. does the part not work properly at lower frequencies? thank you.

  • Hi,

     The user's guide for this device provides a loop response plot for this device.  Is the response you are observing similar to this one? As the test sweeps frequency through the switching frequency region (~100kHz) of the device, the loop response will show such deviations-this is expected.

    Thanks

    Christian