#### sakthivel.eee

##### Junior Member level 3

**am converter dc to dc**

Dear All,

THis is sakthivel from Varroc Enginnering. I am working as Engineer with R&D.

I want to design non-inverting buck-boost dc-dc converter. I am new to the dc-dc converter design.The spec is below.

Buck

Input voltage:48V

Output voltage:10Volts, 45amps

Boost

input voltage:10v

Output Voltage:48volts, 45amps

My question is what will be approximate switching fequency for pratical values of inductor and capacitor for this higher rating? ( I know that As switching frequency increases, inductor size decreases. switching loss increases)

I tryed to calculate the inductance value for 20KHZ as switching frequency. I got around 400uH. But i come to know that 400uH@45amps is diffcult to get in the market. IS it so? If it is, How much inductance value we will get for 45amps? IS 20KHZ is too low switching frequency for dc-dc converter? Generally for higher rating of DC-DC Conveter(45 amps 48 volts) what will be the switching frequency practically used?

Thnaks in advance

Thanks & Regards,

S.Sakthivel