FAN73912MX Integrated Circuits (ICs)

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PMIC - Gate Drivers are among the most common gate drivers used in modern electronics, due to their broad range of applications and the ability to easily interface with other components. The FAN73912MX is an example of such a device, designed specifically for Permanent Magnet (PM) applications, including Brushless DC (BLDC) motors, servo and stepper motors, and switched reluctance motors (SRMs). This application field notes discusses the working principles of the FAN73912MX and its associated features, to provide an overview of its application and the potential it can bring to the electronics industry.

Overview of FAN73912MX

The FAN73912MX is a complete gate-driver integrated circuit (IC) developed by Fairchild Semiconductor. It has been designed to meet the highest requirements for motor control applications, providing a wide range of protection features and high-performance switching characteristics to reduce long-term heat losses and ensure torque dynamics. The device features dual full-bridge outputs feeding the high- and low- side gates of the driver, along with a current-sense amplifier that monitors the current flowing through the bridge. The IC also integrates a short-circuit protection system, an open-drain under-voltage lockout (UVLO) comparator, a thermal shut-down module, and a programmable over-temperature protection system.

Operating principle

The FAN73912MX gate driver has two separate PWM inputs, allowing it to operate in three distinct modes: full-on, half-bridge and off. When operated in full-on mode, both the high and low sides are enabled, providing reliable motor control for permanent magnets. In half-bridge mode, the driver allows for bidirectional drive of the motor, and in off mode, only the high side is enabled, allowing for lower power consumption.

The IC includes an integrated voltage regulator, allowing for either an external or internal power supply to be used. In addition, the device features a built-in margin comparator which allows for additional protection of power circuits, preventing over-current conditions from occurring.

Protection Features

The FAN73912MX gate driver offers a number of protection features, designed to prevent overheating and system damage. An integrated thermal shut-down module monitors the temperature of the IC, and shuts down the device if it exceeds a certain temperature threshold. The over-temperature protection system provides additional safety by triggering an external comparator, if the IC overheats. The device also offers an internal short-circuit protection system which monitors the current flow through the bridge, and will shut down power if an excessive current is detected. Finally, the IC has a programmable over-voltage lockout (UVLO) comparator, allowing for additional protection in high voltage applications.

Applications

Due to its wide range of features and protection systems, the FAN73912MX can be used in a variety of applications, including brushless DC (BLDC) motors, stepper motors, switched reluctance motors (SRMs), and servomotors. The integrated short-circuit and over-temperature protection systems provide a secure environment for the device, allowing it to be used in high current and high voltage applications. In addition, the device is highly flexible, allowing for the use of either an external or internal power supply. Therefore, it can be used in a variety of applications, including motor control, sensor control, and power supply design.

Conclusion

The FAN73912MX gate driver is an ideal solution for motor and power supply applications, thanks to its wide range of features and protective systems. With its bidirectional full-bridge capability, and the ability to operate from either an external or internal power supply, the device is highly flexible, and can be used in a variety of applications. Additionally, the integrated thermal shut-down, short-circuit protection, and over-temperature protection systems ensure the device is safe to use in high current and high voltage applications.Overall, the FAN73912MX gate driver is an ideal device for motor control and power supply applications.

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