I designed a power supply using the switcher TPS564208 and WeBench. The design requirements are: Vin_max =12.0 Vdc, Vout = 3.7Vdc, Iout_max = 3A.
Using WeBench I had the design as follow:
Cin = 2x 10uF @10Vdc (P/N: C1210C106K3RACTU)
Cout = 3x 22uF @10Vdc (C1206C226K8RAC7800)
I hooked up the output of this power supply to the power input of a modem which requires: Vin = 3.7 Vdc and Iin_max = 1.5 A. And I found out that this power supply could not provide enough initial power (in rush current) to turn on the modem.
What's wrong with WeBench suggested this power supply design?
Please response to my question via my email email@example.com