The NuMaker-PFM-M2351 is fantastic board powered by a microcontroller from the ARM Cortex-M23 family. The board combines a secure memory, one WiFi module (ESP8266EX ESP03), one NAU88L25 audio codec with …
A very good Reference Design from TI – Isolated Power Supply for PLC and Data Acquisition: http://www.ti.com/tool/TIDA-00129 Based on a LM5017, a wide Vin Buck Regulator: http://www.ti.com/product/lm5017 Datasheet: http://www.ti.com/lit/gpn/lm5017