L9856

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The L9856 is a member of the PMIC - Gate Drivers family and is most commonly used as an interface between Power Factor Correction (PFC) converters and the Programmable Logic Controllers (PLCs) that control them. It is also used to buffer digital signals and provide circuit protection.

Overview

The L9856 is a current limiting, auto-zero voltage-mode gate driver with a maximum output current of 2 Amps. It is designed to drive N-channel and P-channel MOSFETs, IGBTs and other low-side switching devices. It allows users to benefit from high-speed switching speeds and low power dissipation. It is optically isolated and supports up to 700Vp-p of isolation voltage.

Features and Benefits

The L9856 offers a variety of features and benefits that make it a reliable and effective gate driver. Some of its features include:

• Isolation voltage up to 700Vp-p
• High speed switching up to 1MHz
• Current limiting up to 2A
• Low power dissipation
• Compatible with N-channel and P-channel MOSFETs, IGBTs and other low-side switching devices
• Compatible with a variety of operating voltages

Operation

The L9856 operates on a wide variety of operating voltages, from 3V to 18V. The internal linear regulators are self-biasing, so that their output voltage remains constant regardless of the input voltage. The current limiting feature protects the gate driver from over-current conditions by limiting the output current to 2A.

The gate driver has two inputs, the ENABLE input and the GATE input. When the ENABLE input is high, the output is enabled and the gate output is generated. When the ENABLE input is low, the output is disabled and the gate output is low.

The GATE input controls the gate output of the L9856. If the GATE input is low, the gate output is set to low. If the GATE input is high, the gate output is set to high. The output gate driver can support PWM signals up to 1MHz and can drive a variety of devices, including N-channel, P-channel MOSFETs, IGBTs and other low-side switching devices.

Applications

The L9856 is widely used in a variety of applications, ranging from automotive to industrial systems. It is used most commonly in Power Factor Correction (PFC) converters, which act as an interface between the Programmable Logic Controllers (PLCs) and the controlled loads. It is also used in motor control and voltage Isolation applications, and to drive PWM signals and provide circuit protection.

In automotive applications, the L9856 is used in vehicle stability control systems and start-stop systems. It is also used in solar inverters, motor controllers, power supplies, chargers and more.

Conclusion

The L9856 is a current-limiting, auto-zero voltage-mode gate driver that is used as an interface between Programmable Logic Controllers and Power Factor Correction converters. It is optically isolated and supports up to 700Vp-p of isolation voltage. It is used in a variety of applications, including automotive and industrial systems, motor control and voltage isolation. With its features and benefits, the L9856 makes a reliable and effective gate driver for a variety of applications.

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