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TPS92692-Q1: The effect of adding a capacitor to the gate of the TPS92692

zhang lin
Intellectual 350 points

Part Number: TPS92692-Q1
Other Parts Discussed in Thread: TPS92692

Hello expert, I’d like to ask about the GATE output capability of the TPS92692 chip—specifically, what’s the maximum current it can deliver momentarily?

I’m currently facing a situation where, during EMC testing, I adjusted the gate-to-ground capacitance of the MOSFET. However, I suspect this adjustment might increase the peak current drawn by the chip during switching, making it difficult for me to assess whether there’s any potential risk. Could you please help me with this?

I’d like to know if increasing the GATE-to-ground capacitance will affect the output of the TPS92692 chip, or whether it might cause an excessive inrush current that could damage the TPS92692. Thanks!  

Here’s some of my test data:

image.png

 

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  • 0
    TI__Expert 7740 points

    Hi Zhang, 

    You can remove C41 and R115 as you already have control over the RC filter with R116 and the FETs internal capacitance. EMI mitigation is highly layout dependent and you might have better luck by optimizing the layout. In addition, you can try and add a snubber after the switch node to see if that helps.

    Best,
    Daniel