Electrical
Boards
Power

Power Board

Outline

Raytraced Render

The MUREX Power Board is the world's smallest open-source dual-output, high power module designed for 12V/5V/3.3V DC systems and ROV applications. An integrated current sensor and robust circuit protection combined with microscopic physical dimensions measuring 44mm x 46mm renders the power board an elite feature of MUREX electronics.

Detailed Description

The MUREX Power Board is a compact four-layer power "integration" PCB designed for ROV/robotics and other high current applications. The board expects clean 12V input from a power supply through a horizontal Mega-fit connector, though it can safely handle input voltages up to 17V. The board utilizes two TPS568230 buck converters to provide 5V + 3.3V for the MUREX Carrier Board (opens in a new tab), 3.3V for the MUREX Ethernet Switch (opens in a new tab), and 12V + 3.3V for the ESC Carrier Board (opens in a new tab). A LTC4352 Ideal Diode Controller controls back-to-back SIRA00DP N-channel MOSFETs to provide reverse polarity protection, shorting safeguards, inrush current control, overvoltage and undervoltage protection, and status LEDs that indicate safe power input. Power monitoring is provided by Texas Instruments' INA226, a shunt-based power monitor interfaced through I2C, sensing current, voltage, and power.

Current Status

  • V2.0 tested and functional

Integrated Sensors and ICs

Schematic (PDF)

Schematic Preview

To Do

Changelog

V1.0:

  • Initial Design

V1.1:

  • Removed M.2 connector to Carrier Board (Board Thickness > 0.8mm)
  • Removed ACS712 Hall-Effect Sensor to save cost and board space
  • Added AGND islands to reduce circulating currents
  • Broke out INA226 I2C pins
  • Switched 12VIN connector from Super Sabre to Mega-fit
  • Fixed Si7336ADP polarity

V2.0:

  • Replaced TPS562815 with the TPS562830, a newer, smaller, more efficient alternative by TI
  • Added inrush current control, undervoltage, and overvoltage protection configurations to the LTC4352 using back-to-back mosfets
  • Added TVS diode for surge protection
  • Replaced the Si7336ADP with the SIRA00DP, a newer solution by Vishay with lower Rds, minimal thermal resistance and higher power dissipation. No external heatsinks required
  • Replaced 1x2 screw terminal with 1x3 terminal, breaking out 5V and 3.3V
  • Added two mounting holes for stability
  • Decreased physical footprint by 20%
ESC CarrierNetworking