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PMIC - Gate Drivers

The IRS21956SPBF is an integrated gate driver, designed to provide isolated feedback control of high current power MOSFETs. It integrates a half-bridge output driver and high-side current sensing with a high-gain, fixed frequency PWM error amplifier, offering superior accuracy, performance and minimal space requirements. Within the same package, it also integrates an advanced control logic that enables the control of higher voltages with high power MOSFETs and superior EMI performance, offering a complete solution in a single-chip power semiconductor solution.

Application Field

The IRS21956SPBF has been particularly designed to suit today’s emerging power semiconductor applications. It is suited for a variety of topologies ranging from DC-DC converters, point-of-load converters, LED drivers and motor drives. The combination of a high peak current capability and a wide operating voltage range makes it ideal for a wide range of power semiconductor applications.

The high speed of the driver along with its current sensing input allows for very fast response in motor drives and precision motor control. For example, this type of driver can be used to provide precision current and speed control in drones, robots and other automotive applications.

Working Principle

The IRS21956SPBF is an active current and voltage control based driver. It accepts a control voltage input, allowing the user to control the current transfer to the load. The device is based on a high speed, high gain error amplifier and a half-bridge output stage with an isolated feedback control loop. The output stage contains two power MOSFETs which switch the current to the load at a high frequency, typically 1MHz or above. The device is controlled by the feedback loop which monitors the voltage at the load and adjusts the output accordingly.

The device has a dead-time control input which sets the dead time between the two MOSFETs on the output stage. This is set to a minimum to ensure maximum efficiency, however, higher dead times can be used to reduce overshoot, ringing and other EMI issues in the power system.

The device also features a built in overtemperature protection, current limit and overvoltage protection. This ensures the safety of the device and the system during operation.

Conclusion

The IRS21956SPBF is a highly versatile and reliable gate driver, suitable for a variety of high voltage, high speed applications. It can be used to provide precision current and speed control in drones, robots and other automotive applications, while its built in safety features protect the system from damage. This device can be a great solution for power semiconductor applications requiring high voltage and high speed control.

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