TPS40090: Current load issue

Hello,

What's the inductance and DCR value?
Can you increase value of resistor between ILIM and GND, and check if the load current can increase to 120A?

Thanks
Qian

Hello sir，
The inductance is 0.22uH and DCR is 0.29mohm。The resistor between ILIM and GND is the same as the demo board，the demo board design current is 120A .

Hi Qian,

Actually, I think customer would like to know what the Rcs means at page11 formula 5 in DS? Is it DCR? or current sense mohm resistor?

Thanks.

Yuchang

The ILIM pin voltage is used to set OC threshold. Based on calculation, the ILIM voltage in your design should be high enough.

Can you check if the four capacitors (C139, C141, C143, C144) are placed close to controller CSx and CSN pins?
Also, can you check if the loop is stable? You can check if Vout starts to oscillate and if there is large switching jitter when load current approaches 80A.

Thanks
Qian