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LM5116: question about LM5116MHX/NOPB

Jimmy Huang
Genius 3525 points
Part Number: LM5116

Tool/software:

Hello:

In the client's project, TI's LM5116 is used. When measuring SW and HO, significant ringing and considerable noise on the input were observed. Could you please provide some guidance，Thanks！！！

      

  • 0
    TI__Guru 59001 points

    Hello Jimmy 

    • The switching loop should be small. Please locate low ESR ceramic capacitors between the drain of the high-side MOSFET and the ground connection of RSENSE. 
      https://www.ti.com/video/6285511636001 
    • The diode reverse recovery charge should be small. Please populate a Schottky diode in parallel with the low-side MOSFET. 
    • Switching speed should be slow, please try to add 1-5ohm gate resistor on the high-side gate and make it sure dead-time is enough after adding the gate resistor. 

    -EL