LM5101BMAX/NOPB

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The LM5101BMAX/NOPB is a high-side, low-side processor of the PMIC – Gate Drivers class. It is capable of driving power MOSFETs and IGBTs in either a half-bridge configuration or as a single switch. This application field and working principle will be discussed in depth in this article.

Background

Power management integrated circuits (PMICs) are integrated circuits designed to regulate, control, or monitor various power components and systems within an electronic device. PMICs provide various levels of control, protection, and conversion of power. Gate drivers are one type of PMIC – they are used to drive power MOSFETs or IGBTs used in power switching circuits, such as half-bridge or full-bridge inverter stages. Gate drivers act as a buffer between the driving circuit and the power switch, providing the necessary isolation, timing, voltage control and current.

LM5101BMAX/NOPB Overview

The LM5101BMAX/NOPB is a high-side, low-side processor of the PMIC – Gate Drivers class that is designed to drive power MOSFETs and IGBTs in either half-bridge or single-switch configurations. This device combines a low-side gate driver with a high-side drive that contains both a gate-drive stage and an integrated pre-driver stage. This eliminates the need for two bridge branches, reducing the power losses associated with bi-directional power flow and simplifying the gate drive circuit. The unit is capable of handling up to 41 volts, with a maximum peak output current of 30A, suitable for powering applications such as DC-DC, EV chargers, and LED lighting systems, or working as an operational amplifier.

Operation Principles

The main purpose of the LM5101BMAX/NOPB is to drive the gate of an IGBT or MOSFET using a high-side driver, while also providing protection against power losses. The device comprises three separate channels, an upper high-side driver, a lower high-side driver, and a low-side driver. Each of these channels consists of several stages of PWM control, digital control, logic, and other circuits. These stages provide both switching and protection for the power semiconductor gates.

The high-side driver of the LM5101BMAX/NOPB is designed to be used in a half-bridge configuration, meaning that the two high-side and low-side drivers work together to drive the gate of an IGBT or MOSFET. The high-side drivers contain both a pre-driver and a gate driver stage, while the low-side driver only has a gate driver stage. The pre-driver stage provides protection against voltage surges, while the gate driver stage amplifies the low-voltage signal from the pre-driver and transfers it to the power switch. This ensures that the power switch is correctly driven and is therefore able to correctly control the voltage and current flow. The low-side driver is designed to provide slow turn-on and turn-off times, to ensure that the current flow is smooth and the power losses are kept to a minimum.

The LM5101BMAX/NOPB also features a slew-rate protection circuit which monitors the current and voltage on the low-side and high-side driver channels and automatically adjusts the amount of current flowing through them. This helps to protect the power switch, as large inrush currents can cause power losses and damage the device.

Conclusion

The LM5101BMAX/NOPB is a high-side, low-side processor of the PMIC –Gate Drivers class. It is capable of driving power MOSFETs and IGBTs in either a half-bridge configuration or as a single switch. This device consists of several stages which provide both switching and protection for the power semiconductor gates. In addition, it features a slew-rate protection circuit which monitors the current and voltage on the low-side and high-side driver channels. This helpful device is suitable for powering applications such as DC-DC, EV chargers, and LED lighting systems, or working as an operational amplifier.

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