We have a very old dual-output design based on an LT1244 that we would like to see about cost reducing. The thing that stands out the most is the custom transformer - so we're hoping for some design ideas that use off-the-shelf transformers, or at least, less expensive ones.
As we mention below, we are open to using two independent supplies, but presumably a dual-output should reduce part count and BOM cost.
General requirements:
- Isolation *required*
- Input voltage range: -42 to -56 V (or wider)
- There are also separate digital +5V and -5V rails available if needed for reference/bias/VCC that could potentially reduce the cost (eliminate a tap for the transformer?)
- Fixed Output A: -32V (up to ~700 mA)
- Fixed Output B: something between -46 and -52V (up to ~700 mA)
- To be clear, just need a single fixed output, somewhere in that range. Prefer closer to -46 than -52.
- Load split:
- In some applications, load will all be on a single output
- In other applications, load will be divided between outputs
- Space is not a huge concern, so prefer cost focus rather than space focus
- If that is more cost effective, two independent supplies might fit on the PCB, depending on size
- Not particular about discrete or module
- No preference for topology
- I-temp (ambient: -40 to +65C [preferably higher])
Thank you!
