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Forum Post: RE: TPS40170 start up issues

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Hi Ramnath,

Thank you for the screenshots on each pin. The switching waveform and high-side gate drive are very odd.

I now noticed the ILIM resistor of 191kΩ is very large. This puts the ILIM voltage well above the 300mV max Ilim pin voltage operating range. Can you try reducing this to 25kΩ? Based on the 16mΩ max Rdson of the low-side FET, with two of them in parallel a 25kΩ resistor sets the OC limit at approximately 28A typical.

Best Regards,
Anthony


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