MP1921HR-A-LF-P

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Introduction

The MP1921HR-A-LF-P is a Power Management Integrated Circuit (PMIC) - Gate Driver developed by Richtek Technology Corporation, founded in 1994 and based in Taiwan. MP1921HR-A-LF-P powers modern electronic products and systems as a solutions-oriented microelectronic company. It is a high voltage, high current, low ESR and high efficiency gate driver designed to provide a high level of performance in a small package form factor. This device is commonly used in automotive, medical, industrial, data storage, and consumer applications where low noise, high frequency, high speed, and high efficiency are desired.

Applications of the MP1921HR-A-LF-P

The MP1921HR-A-LF-P is a general purpose gate driver in the PMIC - Gate Drivers family. It is designed to drive high gate capacitance loads such as IGBTs, MOSFETs, relays and others. It is capable of driving up to 3A continuous current with a peak of 6A. The device has an adjustable output voltage range of 5V to 24V and can drive a load up to 26V. The output can be protected from reverse voltages and transients using an active low enable/disable feature and an adjustable overcurrent protection. The device can be used in a wide range of applications including motor drive, inverters, Solid State Relays (SSRs) and uninterruptible power supplies (UPSs).

Features of the MP1921HR-A-LF-P

The MP1921HR-A-LF-P offers several features designed to provide top performance. It is composed of a 16 pin SOIC package with a decent thermal resistance of RθJA of 105°C/W and power dissipation of 1W. It has an input voltage range of 4.5V to 18V and supports adjustable deadtime with a maximum of 800 ns. It has a low standby current of 5 uA, an adjustable undervoltage lockout of 2-5 V, and is short-circuit protected. The device has a maximum switching frequency of 800kHz, is reversible and includes current limiting. The output can be protected from reverse voltages using a negative transient suppressor.

Working Principle of the MP1921HR-A-LF-P

The working principle of the MP1921HR-A-LF-P is based on a two-switch, two-resistor buck-boost converter. The two external gate capacitors are connected to the control pins and the control logic circuit. When the input voltage is low, the high side switch is turned on first, followed by the low side switch. This action charges the output capacitors and allows the output voltage to rise to the desired level. As the output voltage is increasing, the control logic circuit reduces the duty cycle of the switches to maintain the desired output voltage. When the output voltage reaches the setpoint, the switches are turned off and the output holds the current level. If the input voltage is higher than the output voltage, the control logic circuit turns on the high side switch while the low side switch remains off. This action increases the output voltage until the desired level is reached.

The MP1921HR-A-LF-P differs from other gate driver circuits in that it eliminates current sense resistors to detect an overcurrent condition. This improves efficiency and increases the life of the device. It also eliminates the need for a separate overvoltage protection circuit. The voltage regulating capabilities are integrated into the control logic circuit. This allows the device to operate at a high frequency without experiencing an undesired current spike. The open loop operation of the circuit enables it to work efficiently even under varying load conditions.

Conclusion

The MP1921HR-A-LF-P is a high performance PMIC - Gate Driver designed to provide high levels of efficiency and reliability. It is a comprehensive device capable of driving high gate capacitance loads, with adjustable output voltages, adjustable deadtimes and reverse voltage protection. The device features a two-switch, two-resistor buck-boost converter which allows it to maintain a constant output voltage, even under varying load conditions. The device is suitable for a wide range of applications such as motors, inverters, SSRs and UPSs.

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