hm_fa_da
Full Member level 5
Hi,
I'm using TI TPS62745 buck converter for reducing about 7 Volts to 2 Volts. in datasheet and TI calculator software, it's recommended to use a fixed value capacitance for input or output.
My question is: the capacitance which they recommend is the least value and can be more than that ? wouldn't it make problem for Buck converter switching function ?
for example, for the converting i said, TI calculator software recommended 10uF capacitor in input and output too, now there are two problems :
1- in output line, connecting to MCU, i used some different value capacitors for bypass and surge current sources ... now their value will be added to output of Buck converter circuit !
this is the sample schematic:
2- i used the same battery source for another buck converter, 7 to 3.8V for GSM module, that circuit also has input capacitor so it's value will be added to other buck circuit input capacitance ...
or even i have to use some high value capacitors near GSM module to supply transient current consumption and those will be added to output of 3.8V buck circuit ...
I'm using TI TPS62745 buck converter for reducing about 7 Volts to 2 Volts. in datasheet and TI calculator software, it's recommended to use a fixed value capacitance for input or output.
My question is: the capacitance which they recommend is the least value and can be more than that ? wouldn't it make problem for Buck converter switching function ?
for example, for the converting i said, TI calculator software recommended 10uF capacitor in input and output too, now there are two problems :
1- in output line, connecting to MCU, i used some different value capacitors for bypass and surge current sources ... now their value will be added to output of Buck converter circuit !
this is the sample schematic:
2- i used the same battery source for another buck converter, 7 to 3.8V for GSM module, that circuit also has input capacitor so it's value will be added to other buck circuit input capacitance ...
or even i have to use some high value capacitors near GSM module to supply transient current consumption and those will be added to output of 3.8V buck circuit ...