3-Phase Brushless Motor Driver

This 3-Phase Brushless Motor Driver features the FAN73893 3-Phase Half-Bridge Gate Driver and 6XFDB047N10 MOSFET, delivering a compact design that supports currents up to 5A and operates within a power supply range of 12V to 60V DC. The board is equipped with a screw terminal connector for effortless connection of the motor and motor power, as well as a header connector for connecting input signals and logic gate driver power supply. The input signals are compatible with both 3.3V and 5V logic levels.

The gate driver chip incorporates overcurrent protection features, including a default overcurrent threshold of 10A, which can be adjusted using a shunt resistor. The overcurrent detection is triggered when the voltage across the shunt resistor exceeds 500mV. In the event of an overcurrent fault, the fault clear time is set to 2ms using a 2.2nF capacitor (C7). This ensures the motor driver’s reliable and efficient operation. The project requires 6 PWM signals. Arduino or any other microcontroller can be used to control this board.

Features

•  Motor Power Supply 12V to 60V DC
• Load Current Up to 5A
• Over Current Threshold Approx. 10A
• 6 x PWM Input Signals 3.3V and 5V Compatible
• PWM Frequency up to 20Khz
• Screw Terminals for Motor Connections
• Screw Terminals for Motor Power
• Header Connector for Input Signals
• Header Connector for VCC and 5V Fault
• On Board Power LED
• 4 x 4 mm PCB Mounting Holes
• PCB Dimensions 88.27 x 64.14 mm

Protection Function

Fault Out (FO) and Under−Voltage Lockout The high− and low−side drivers include Under−Voltage Lockout (UVLO) protection circuitry that monitors the supply voltage for VDD and VBS independently. It can be designed to prevent malfunction when VDD and VBS are lower than the specified threshold voltage. The UVLO hysteresis prevents chattering during power−supply transitions. Moreover, the fault signal (power supply voltage FO) goes to LOW state to operate reliability during power-on events when the power supply (VDD) is below the under−voltage lockout high threshold voltage for the circuit (during t1~t2). The UVLO circuit is not otherwise activated; as shown in Figure 38. If VDD is lower than 3.5 V, the fault signal cannot be driven to LOW state because VDD is not enough to drive the internal circuit.

The FAN73893 is a monolithic three-phase half-bridge gate-drive IC designed for high-voltage, high-speed, driving MOSFETs and IGBTs operating up to +600 V. ON Semiconductor’s high-voltage process and common-mode noise-cancelling technique provide stable operation of high-side drivers under high-dVs/dt noise circumstances. An advanced level-shift circuit allows high-side gate driver operation up to VS = -9.8 V (typical) for VBS =15 V. The protection functions include under-voltage lockout, inter-lock function, and inverter over-current trip with an automatic fault-clear function. Over-current protection that terminates all six outputs can be derived from an external current-sense resistor. An open-drain fault signal is provided to indicate that an over-current or under-voltage shutdown has occurred. The UVLO circuits prevent malfunction when VDD and VBS are lower than the threshold voltage. Output drivers typically source and sink 350 mA and 650 mA, respectively; which is suitable for three-phase half-bridge applications in motor drive systems.

FAN73893 Features

• Floating Channel for Bootstrap Operation to +600 V
• Typically, 350 mA/650 mA Sourcing/Sinking Current-Driving Capability for All Channels
• Extended Allowable Negative VS Swing to -9.8 V for Signal Propagation at VDD=VBS=15 V
• Outputs Out of Phase with Input Signals
• Over-Current Shutdown Turns Off All Six Drivers
• Matched Propagation Delay for All Channels
• 3 V and 5.0 V Input Logic Compatible
• Adjustable Fault-Clear Timing
• Signal Interlocking of Every Phase to Prevent Cross-Conduction
• Common-Mode dVs/dt Noise-Cancelling Circuit
• Built-in Advanced Input Filter
• Built-in Soft Turn-Off Function
• Built-in UVLO Functions for All Channels

Connections

• CN1: Pin 1 Motor Supply 24V to 60V DC, Pin 2 = GND
• CN2: Pin 1 VCC 12-15V DC, Pin 2 = HIN1, Pin 3 = HIN2, Pin 4 = HIN3, Pin 5 = LIN1, Pin 6 = LIN2, Pin 7 = LIN3, Pin 8 = Fault Out, Pin 9 = Enable -High for Normal Operations, Pin 10 = GND
• CN3 Motor Connections: Pin 1 = Motor Phase 1, Pin 2 = Motor Phase 2, Pin 3 = Motor Phase 3
• CN4: Pin 1 = VCC 12V to 15V, Pin 2 = GND, Pin 3 = GND, Pin 4 = 5V DC
• D1: Power LED

Schematic

Parts List

Connections

Typical Application Diagram

Functional Chip Diagram

Input – Output Diagram

Overcurrent Protection

Shoot-Through Protection

Gerber View

Photos

FAN73893 Datasheet

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