The motor controller is the L6234 3-Phase Amplifier by ST. The chip includes the following features:

• SUPPLY VOLTAGE FROM 7 TO 52V
• 5A PEAK CURRENT
• RDS ON 0.3W TYP. VALUE AT 25°C
• CROSS CONDUCTION PROTECTION
• TTL COMPATIBLE DRIVER
• OPERATING FREQUENCY TO 50KHz
• THERMAL SHUTDOWN
• INTRINSIC FAST FREE WHEELING DIODES
• INPUT AND ENABLE FUNCTION FOR EVERY HALF BRIDGE
• 10V EXTERNAL REFERENCE AVAILABLE
• Application Note

The following circuit implements the support required for basic L6234 operation: