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DC to DC step down switching regulator using LM5088MH-1/NOPB

Prakash Magadi
Prodigy 40 points
Other Parts Discussed in Thread: CSD17579Q3A, LM5008

hi,

i have designed DC to DC step down switching regulator using LM5088MH-1/NOPB with input voltage range 9V to 22V and output voltage 5V,output current 10A.the schematic is generated from TI webench design and components are used as per the webench design. when i put load of 20% of output current ,that output voltage is droping to 4.5v with supply input of 9V and HG of the LM5008 is showing 0.8V ,actually it should be 1.5V minimum (VGS(th)) to drive the MOSFET (CSD17579Q3A) but it is not happening what could be the reason

2021.Doc1.pdf

  • 0
    TI__Mastermind 31580 points
    Hi Prakash,

    The LM5008 is a non-isolated controller, I will move the post to the non-isolated forum and one of the apps engineer will answer your post.

    Regards

    Peter
  • 0
    Prodigy 40 points

    hi,

    i have designed 

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    ith input voltage range 9V to 22V and output voltage 5V,output current 10A.the schematic is generated from TI webench design and components are used as per the webench design. when i put load of 20% of output current ,that output voltage is droping to 4.5v with supply input of 9V and HG of the LM5008 is showing 0.8V ,actually it should be 1.5V minimum (VGS(th)) to drive the MOSFET (CSD17579Q3A) but it is not happening what could be the reason