+-15V isolated DC-DC converter module with LDO output low noise PCB mounted

• +-15V isolated DC-DC converter module with LDO output low noise PCB mounted
  Posted by mnni on 20 Jan, 2021 11:37
• I am looking for inputs to select a low noise +-15V isolated DC-DC converter module,  for a low noise <1MHz analogue circuit
  isolations i needed to break ground loops/avoid them.
  Requirements:
  Input voltage: 5V ( but others voltage can do as i have not settle on the main PSU)
  PCB mounted
  1Watt will do
  Isolating 500V is ok
  Low EMI as i will have near by connectors and PCB's i want to avoid coupling to
  if LDO output not included a good candidate for that is also highly well-come  - I prefer my output voltage being +-15V but my circuit will work down to +-12V
  
  thanks
  
• #1 Reply
  Posted by Benta on 20 Jan, 2021 18:14
• The best I've worked with are from Traco Power.
  
  https://www.tracopower.com/de/dc-dc-converters
  
  But they're not the cheapest.
  
  No affiliation.
  
• #2 Reply
  Posted by mnni on 21 Jan, 2021 08:47
• already had a look on Traco and found this one https://docs.rs-online.com/8145/0900766b816ed6f1.pdf   with low noise
  but its kind of expensive! and i do not need that much current
  
  i may consider taking a cheaper one and add an LDO  but there is still the emi but may be just fine with a good EN 55032  rating
• #3 Reply
  Posted by Berni on 21 Jan, 2021 08:54
• Quote from: mnni on 21 Jan, 2021 08:47

  already had a look on Traco and found this one https://docs.rs-online.com/8145/0900766b816ed6f1.pdf   with low noise
  but its kind of expensive! and i do not need that much current
  
  i may consider taking a cheaper one and add an LDO  but there is still the emi but may be just fine with a good EN 55032  rating
  

  
  That is the price you pay for taking modular power solution shortcuts. Little PCB mount switcher modules tend to usually be significantly more expensive than making your own application specific optimized solution.
  
  Also careful with common mode noise on isolated switcher modules like this. The sharp switching edges love to jump across parasitic capacitance of transformers (switcher modules have to contend with this too as they contain the same transformers inside).
• #4 Reply
  Posted by strawberry on 22 Jan, 2021 12:29
• SN6505A