I would like to use the '1048 in a 1.6kW PFC application with up to 305VAC input for LED lighting. Anyone done this? Any reason I can't? What is the voltage we'll have to boost to - 440?
Here is the answer to your question.
Theoretically the max voltage on the part is 3.3V. However, the input voltage is sensed using voltage dividers and they can be sized in a manner that the ADC on the VAC pin (this is the pin that senses the input voltage) does not get saturated. So in short, yes, the input voltage can go to 305VAC. Also, since the part is a PMBUS compliant part the readback of the input voltage is based on an exponent and mantissa that is selectable. If you use the ADP1047 GUI the VAC window (attached below)does all these settings for you and you simply have to select the max range. This range is reflected in table 10 of the datasheet (also attached below).
Now the second part of the story: Are you are referring to the 300 Watt eval board? If yes, then the max voltage for that board is 265VAC as the MOSFETs and diodes have been selected for a max of 265VAC.
I hope this solves your concern and please let me know if I can be of further assistance.
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