Rev 7
The Recom module offered an easy solution to PCB layout and design, but didn't have very good performance at light loads and had an inductor that frequently broke during assembly or testing. To mitigate these, a new regulator design using the LMZM23601 regulator module from TI. This is a much smaller design that can supply up to 1 A of current with good regulation and low voltage ripple at low currents.
Voltage Regulation and Efficiency plots were created using a Rev 7 controller board that's powered by a power supply and is loaded using a BK 8600 E-Load. The voltage drop is mostly caused by the ideal diode IC.
These charts are in HW-189 and HW-190.
Rev 5 & Rev 6
Unfortunately, our previous regulator (AP65200) is out of stock and looking like it's EOL. We plan on switching to a power module/DC-DC to hopefully save space and allow for a 2-layer board.
...
- Recom Power ROF-78E3.3-0.5SMD-R
- Texas Instruments TPS82130SILT
- Volgen America/Kaga Electronics USA PM-500A33
Outcome
Based on cost, the Recom power module is the best fit. We were able to fit it onto the Rev5 controller board.
In the case that the controller board is updated in such a way that the module no longer fits, the TI controller is a very interesting alternative that would be more flexible.