Hi there,
I'm trying to build a varying voltage supply (1.2-1.8) with the TPS548A20 by TI. I've been using their WEBENCH tool and have calculated for 1.2V I'll need a 1.5uH inductor and for 1.8V I'll need a 2.2uH inductor both @400kHz. I would like to keep Iout above 10amps. The voltage input will be either 12 or 5 volts. I looked at the datasheet to find the equation for the inductor and plugged that into a spreadsheet (attached). My question is when choosing the inductor, should I choose an inductor that meets my minimum Iout even though it has the ability to exceed my Iout rating on the IC? Should I be concerned with the frequency I choose? What's the best practice in this case?
I'm trying to build a varying voltage supply (1.2-1.8) with the TPS548A20 by TI. I've been using their WEBENCH tool and have calculated for 1.2V I'll need a 1.5uH inductor and for 1.8V I'll need a 2.2uH inductor both @400kHz. I would like to keep Iout above 10amps. The voltage input will be either 12 or 5 volts. I looked at the datasheet to find the equation for the inductor and plugged that into a spreadsheet (attached). My question is when choosing the inductor, should I choose an inductor that meets my minimum Iout even though it has the ability to exceed my Iout rating on the IC? Should I be concerned with the frequency I choose? What's the best practice in this case?
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