Electronic – I can not understand this circuit diagram

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schematic of an off-line flyback converter

I've many questions about this circuit diagram. I found it on the datasheet of NCP1012. It is a switching mode power supply SMPS.

  1. Are E1 and E2 electrolytic capacitors and C1 and C2 Ceramic Capacitors?
  2. What is the value of C2? Is it 2.2 nF? and what is the meaning of /Y next to its value?
  3. What are the numbers that are around transformer pins? Is number 5 connected to ground?
  4. What are J1 CEE7.5/2 and J2 CZM5/2? I think they are simply output and input.
  5. What is the turns ratio? If I need a 5 v output, Should I change the ratio?

Best Answer

Are E1 and E2 electrolytic capacitors and C1 and C2 Ceramic Capacitors?

E1 and E2 are polarised. electrolytic capacitors. C1 & C2 are unpolarised & could be ceramic

What is the value of C2? Is it 2.2 nF? and what is the meaning of /Y next to its value?

The value of C2 is 2.2nF. The Y means the safety type of capacitor. X are good across lines and Y are good for line-Chassis. Its all associated with their failure modes.

What are the numbers that are around transformer pins? Is number 5 connected to ground?

They are the pins of the Transformer and yes pin 5 is connected to some reference point that maybe ground, maybe chassis. A larger grounding scheme would be needed to confirm this

What are J1 CEE7.5/2 and J2 CZM5/2? I think they are simply output and input.

These are input and output connectors/headers.

What is the turns ratio? If I need a 5 v output, Should I change the ratio?

There isn't enough information to state either way unfortunately.

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