PCB-MC-PSM

Modular/Configurable Power Supply Module (PSM) Board. This PCB works as a standalone PSM that also has high current connections for servos and mosfets.

Modular/Configurable PSM Board "Version-A" Features

• Power Supply Module board that supports power, servos, and mosfets
  • all high current devices should be managed by this board
• Supports a battery input voltage range that covers 6 to 16.8V
  • This voltage range ensures that 2s to 4s LiPo batteries can be used
• Has a PMIC that outputs a regulated 5V and supports at least 5A continuous
• Has a high current diode rectifier to support a second power input
  • intended for a secondary battery or a power supply for keeping the main PSM battery from discharging
• Has terminal blocks for battery connections

TODO

• 5 Mosfet channels

  • 2 5V channels
  • 3 VBatt channels
  • continuity checking on all channels
    • optionally uses alternative continuity circuit (NFET instead of voltage divider) [1/15/2025]
  • current limiting resistors or fuses on all channels
    • uses a high wattage-rated resistor to limit the current to a level that the traces can handle

• 4 Servo connections

  • uses a screwless terminal block connection
    • ex: TE 1-2834015-4 Buchanan WireMate
  • uses inline PTC fuses for each servo

• Connectors for STEVE board signals

  • Uses screwless terminal block connectors or JST-GH connectors
  • Servo PWM signals (4)
  • Mosfet gate signals (5)
  • Mosfet continuity signals (5)
  • Battery Voltage sensing lines (1)

• import/assign missing 3D part models

Future Updates

Future PSM Board Updates

• create additional PSM boards with more/less features depending on desired capability
  • ex: a larger PSM board with a second PMIC to support more servos and mosfets
  • ex: a smaller PSM board with fewer supported servos/mosfets and/or a lower current rating
• use a PMOS mosfet for reverse polarity protection
• current draw sensing that can be reported to the main STEVE board