Onsemi FAN73896MX: High-Voltage Half-Bridge Gate Driver IC

In the realm of power electronics, efficient and reliable control of high-voltage switching devices is paramount. The Onsemi FAN73896MX stands out as a monolithic high-voltage gate driver IC specifically engineered to drive both high-side and low-side N-channel power MOSFETs or IGBTs in a half-bridge configuration. This device is a cornerstone in applications requiring robust performance, such as motor control systems, switch-mode power supplies (SMPS), and uninterruptible power supplies (UPS).

A key feature of the FAN73896MX is its ability to operate with high-voltage rails up to 600V. This capability allows it to handle significant power levels, making it suitable for demanding industrial environments. The IC integrates a floating high-side driver that uses Onsemi's proprietary high-voltage IC technology. This design enables the high-side channel to operate effectively despite the rapidly switching common-mode voltage, ensuring stable and accurate control of the upper power switch.

To prevent catastrophic shoot-through currents that can destroy power switches, the IC incorporates advanced dead-time control. This feature ensures that the high-side and low-side drivers are never simultaneously active, providing a critical layer of protection for the entire power stage. Furthermore, the device boasts a robust level of integration and protection. It includes under-voltage lockout (UVLO) circuits for both the high-side and low-side drivers, which halt operation if the supply voltage drops below a safe threshold, safeguarding the MOSFETs or IGBTs from operating in a linear, high-loss region.

The FAN73896MX is designed for compatibility with standard control circuits, accepting logic-level inputs from microcontrollers or DSPs as low as 3.3V. This simplifies interface design and allows for direct connection to modern digital controllers without additional level-shifting circuitry. Its output drivers are capable of delivering peak currents up to 350mA (source) and 650mA (sink), facilitating fast switching transitions that are essential for minimizing switching losses and improving overall system efficiency.

Housed in a space-saving SOIC-8 package, the FAN73896MX offers a compact yet powerful solution for high-performance half-bridge applications. Its combination of high noise immunity, robust protection features, and efficient driving capability makes it an excellent choice for designers aiming to enhance the reliability and performance of their power conversion systems.

ICGOOODFIND: The Onsemi FAN73896MX is a highly integrated, robust, and efficient solution for driving half-bridge topologies, offering essential protections and high-voltage capability that are critical for modern power electronics.

Keywords: Half-Bridge Gate Driver, High-Voltage Operation, Dead-Time Control, Under-Voltage Lockout (UVLO), MOSFET/IGBT Driver.