ADP1048 with DC supply

unneback on Jan 9, 2019

Hello,

I am designing a bridgeless PFC baed on ADP1048 with input 85-264VAC. It should also be possible to run the converter with DC input.

Would that be possible ?

I understand that when running on DC only on of the boost phases would be used.
Meaning that running on DC input would require that each phase must be designed for full output power

thanks
/Michael

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ADIApproved
Jan 10, 2019 +1 verified
Yes, it is possible. However, it is recommended that the VAC pin see a voltage that is always greater than 1/10 the full scale range i.e. > 1.6/10= 0.16V. This means that the resistor divider on VAC pin…

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+1 ADIApproved

on Jan 10, 2019 5:50 PM
Yes, it is possible. However, it is recommended that the VAC pin see a voltage that is always greater than 1/10 the full scale range i.e. > 1.6/10= 0.16V. This means that the resistor divider on VAC pin be such that at the minimum input voltage the VAC pin sees more than 0.16V.
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+1 ADIApproved

on Jan 10, 2019 5:50 PM
Yes, it is possible. However, it is recommended that the VAC pin see a voltage that is always greater than 1/10 the full scale range i.e. > 1.6/10= 0.16V. This means that the resistor divider on VAC pin be such that at the minimum input voltage the VAC pin sees more than 0.16V.
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