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LMR54410: SW Foot Negative Pressure Overspecification Problem Inquiry

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Prodigy 30 points
Part Number: LMR54410

In the use of TI LMR54410, the test found that the SW foot negative voltage exceeds the standard problem
Test conditions: input Vin = 24V, output Vout = 12V; startup, SW foot negative voltage to -4.8V; normal operation, SW foot negative voltage to -2.4V, more than the specification of -0.3V, waveforms see attached.
Below is the schematic diagram and PCB for reference.
Is there any related design problem。Please kindly help to provide some design or improvement suggestions

  • 0
    TI__Genius 9641 points

    Hello Sir,

    Below are my comments:

    1:Adding 10-20ohm Rboot(R522) can help slow slew rate and this can reduce SW stress

    2:Actually the high negative voltage is caused by improper test metod

    • Choosing probe with ground leads and full bandwidth measurement;
    • Recording length of oscilloscope selected as maximum point(20M).
    • Suitable measurement time scale

    3:For layout please see below 

    B R

    Colin