How to determine the OP's Bandwith?

[jluhzw]

Hello
Now I am doing a project about DC-DC Converter and its switching frequency is at 1.5MHz. When I design the bandgap reference of the project, I no idea how to determine the op's bandwidth,is it should lower or higher the switching frequency 1.5MHz?
Everybody, when you design the op for the bandgap, which is the criterion to determine the gain and the bandwidth of the op ?

 

[jfyan]

Hello
Now I am doing a project about DC-DC Converter and its switching frequency is at 1.5MHz. When I design the bandgap reference of the project, I no idea how to determine the op's bandwidth,is it should lower or higher the switching frequency 1.5MHz?
Everybody, when you design the op for the bandgap, which is the criterion to determine the gain and the bandwidth of the op ?

hi,
i have not designed dc-dc converter before, but i think the op-amp in bandgap ckt has no direct relationship with the switching frequency of dc-dc converter.
so, the bandwidth of the op-amp can be as large as possible,but guarantee the stability of the feedbcak loop in bandgap ckt.
corret me if i'm wrong.
good luck
jeff