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Original question:

LM5117-Q1: TECHNICAL EXPLAINATION REQUIRED FOR SUGGESTED RECOMMENDATION

LM5117-Q1: LM5117-Q1: TECHNICAL EXPLAINATION REQUIRED FOR SUGGESTED RECOMMENDATION

Sambit Kumar P
Prodigy 40 points
Part Number: LM5117-Q1

Tool/software:

  1. LM5117QPMHX_NOPB gate resistance can be tuned to 9 ohm without compromising working and efficiency of buck
  2. When there is no load connected to LM5117QPMHX_NOPB buck, why there is more emission at 960kHz. What is the mode it operates at no load?

Supply Input 16-32 V ; Nominal Voltage input 28V output voltage is 12V ,3A. 

  • 0
    TI__Guru 58351 points

    Hello Sambit 

    1. You should check if the dead time is enough after adding the 9Ω gate resistor. If not enough, please consider using gate diode and resistor combination. 

    2. It should be in the diode emulation mode since the DEMB pin is floating now. 960kHz might be a resonance frequency in DCM, please measure the SW node waveform at no load. 

    -EL