In what cases/application is a high switching frequency desired and vice-versa? I'm trying to choose a DC-DC booster IC and I don't quite know how the switching frequency will affect the circuit. Only thing I can think of now is the speed of the Schottky diode that goes after the inductor, but other than that, I don't know. Google isn't very helpful on this one (or maybe I 'm not use the right keywords) so any help is greatly appreciated.
Electronic – What effect does switching frequency have on a switching booster circuit
boost
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Best Answer
In general, in both boost and buck switching regulators, a higher switching frequency allows the use of physically smaller inductors and capacitors. However, a high switching frequency can also eat into the overall efficiency of the regulator, through switching losses both in the switch itself and in the gate-drive circuit.
Yes, the diode contributes something to switching losses, too, but that can be mitigated by using synchronous rectification; i.e., replacing the diode with another MOSFET. (But then, that MOSFET has gate-drive losses, too ... as you can see, optimizing one of these designs can involve a surprising number of tradeoffs.)