Design AC-DC power supply using Innoswitch and custom transformer

• #50 Reply
  Posted by VEGETA on 02 May, 2024 19:04
• I have decided to use this switcher IC: https://www.lcsc.com/product-detail/Power-Distribution-Switches_Diodes-Incorporated-AP22966DC8-7_C441830.html
  
  please check schematic in attachment.
  
  basically, i shorted the 2 inputs since the switch is supposed to switch between 2 power sources to deliver to one output.
  
  will this cause problems like shorting? I've put some soft-start caps to make it a bit gentle.

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• #51 Reply
  Posted by xvr on 02 May, 2024 19:57
• This switch include discharge resistor on each output channel that turned on when channel disabled (as followed from schematic in datasheet). You short output from both channels, so one of discharge resistor always will be connected parallel to output. Its value is 220-300 Ohm. You can use this switch if you can tolerate such surplus load.
• #52 Reply
  Posted by VEGETA on 02 May, 2024 20:58
• Quote from: xvr on 02 May, 2024 19:57

  This switch include discharge resistor on each output channel that turned on when channel disabled (as followed from schematic in datasheet). You short output from both channels, so one of discharge resistor always will be connected parallel to output. Its value is 220-300 Ohm. You can use this switch if you can tolerate such surplus load.
  

  
  worst case is 5v for 300 ohms = 16.7 mA. very tiny, won't make an effect.
  
  however will this circuit yeild any dangerous issue like shorting?
  
  a simpler solution is to use such a switch like this one: https://www.lcsc.com/product-detail/Toggle-Switches_YUEN-FUNG-ST-0-103-A01-T000-RS_C1788488.html
  
  i want one which does not have luggs and stuff, but overall it is more expensive though, cheapest ever is a jumper but it is not elegant
• #53 Reply
  Posted by xvr on 02 May, 2024 21:14
• Quote

  however will this circuit yeild any dangerous issue like shorting?

  I see no danger. It should work.