will_fung
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Hi Everyone,
I need help on this circuit, this circuit was designed by other engineers in my company, but, now, we have a problem.
It is use to provide power to the cell phone, while I switch S7 change the voltage from 3.9V to 3.2V, there is a big undershoot that make the phone crash down. could you tell me how to fix this problem?
I tried to add 10 pcs of 470uF Tan capacitors on the trace of VBATT_CAL and the overshoot can be reduced to 86mV, the cell phone can work well. but the quantity of the capacitor is too much, I also worry about the inrush current.
Thanks a lot.
I need help on this circuit, this circuit was designed by other engineers in my company, but, now, we have a problem.
It is use to provide power to the cell phone, while I switch S7 change the voltage from 3.9V to 3.2V, there is a big undershoot that make the phone crash down. could you tell me how to fix this problem?
I tried to add 10 pcs of 470uF Tan capacitors on the trace of VBATT_CAL and the overshoot can be reduced to 86mV, the cell phone can work well. but the quantity of the capacitor is too much, I also worry about the inrush current.
Thanks a lot.