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this buck is a low power, about 600mA output, and the efficiency not so bad, i want the maximum efficiency above 92%. and the reason of high frequency is small external components, good load transient and line transient.
hi all, does anybody had done high frequency synchronous buck, what the limitation is? now, the spec is: vin 2.5v-5.5v, vout 0.8v-3.3v, frequency=4Mhz, i want to use peak-current-mode, but the blanking time will limit the minmum duty cycle. any good method can reduce the blanking time? or...
in my opinion. for the efficiency, when you use synchronous mosfet, you need a much bigger low-side mosfet, or the efficiency will be low;
if you use the peak-current mode, u need a blanking time, so that means the frequency can't high enough.
if u just want an cursoy model , peak current mode ,u can use vccs to replace the switch mos; voltage mode, u can use vcvs to replace the switch mos. if you want more precision model, u can refer to the book <fundementals of power electonics>
dc-dc problems
I have EMI problem at about 100Mhz, i do not known the reason? is because of the rise time of SW node, or the ring of the SW node, in a DC-DC converter chip? anybody can help me , thanks a lot!
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