Part Number:UCC28722
Hi,
I'm designing my power supply for my single phase smart meter based on this Application Report SLUA721 and i have some questions:
1/ I'm wondering why in this Application Report they designed the power supply using the maximum voltage as line to line voltage and not as line to neutral despite that this power supply aims a Single Phase Smart Meters which mean the power should be drawn from a phase to line voltage.
For example the voltage of the capacitors diodes, varicap ... was chosen considering the voltage level equal to 415 VAC +20% which is equal to 500 VAC
so considering that i'm designing my power supply for a Single Phase Smart Meters which mean the voltage should be at maximum equal to 240v. Can i revise some components voltage like varistor, VCE for the NPN transistor to a minimum value of 240 + 20% which is equal to 288v?
2/ in continuation of the previous question, can i replace the switching bipolar transistor used in the documents KSC5026MOS which the Voltage - Collector Emitter Breakdown equal to 800V to this one KSE13003H2ASTU which the Voltage - Collector Emitter Breakdown equal to 400V ?
3/ i was reading this document 'Basic Calculation of a Buck Converter's Power Stage' and i want to know please where the equation number 12, of calculation of the output capacitor, came from ?
thanks,
i'm wondering why in this Application Report they designed the power supply using the maximum voltage as line to line voltage and not as line to neutral despite that this power supply aims a Single Phase Smart Meters.
For example the voltage of the capacitors diodes, varicap ... was chosen considering the voltage level equal to 415 VAC +20% which is equal to 500 VAC
so considering that i'm designing my power supply for a Single Phase Smart Meters which mean the volatage should be at maximum equal to 240v.
Can i revise some components voltage like varicap, VCE of the NPN transistor to a maximum value of 240 + 20% which is equal to 288v?