Yp-05 Schematic Link [ RECOMMENDED — 2027 ]

The standard 6-pin header is labeled: DTR, RXD, TX, VCC, CTS, and GND . Application & Troubleshooting Tips

Replace catch diode D2 (SS54) with a low-Rds(on) MOSFET and a gate driver. This increases efficiency from ~85% to ~95% at 4A. You will need to modify the schematic to route a complementary gate drive – not for beginners. Yp-05 Schematic