UCC28C44DG4

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Texas Instruments UCC28C44DG4 is a dual high and low-side gate driver IC designed for driving high power n-channel MOSFETs and IGBTs in various offline applications. It supports higher output currents, up to 2A peak and 1.5A continuous, which makes it an excellent choice for applications requiring superior driver performance. The UCC28C44DG4\'s dual high and low-side gate drivers combine with TI\'s family of offline power switches and TI\'s phaseloss pre-drivers to offer a complete solution for high-power systems.

The UCC28C44DG4 is a dual channel high and low-side gate driver IC that combines the major features of the UCC28C44 and UCC28C45 in a small footprint package. It has two dedicated high and low-side gate driver outputs that can support output current up to 2A peak and 1.5A continuous. It features proprietary built-in fault protection features that protect the driver outputs from overvoltage, undervoltage, overcurrent and short circuit conditions. The common-mode logic inputs and the fault status output signals are TTL/CMOS compatible to allow easy integration with digital controllers. The overcurrent and short-circuit protection circuitry of the UCC28C44DG4 ensures maximum power dissipation and long term reliability in power supply products.

The UCC28C44DG4 is designed for offline applications such as servers and telecom equipment, intermediate power supplies, displays and light industrial applications. It has a selectable slew rate of up to 1MHz facilitating the design of very efficient DC-DC converters and switcher supplies. Furthermore, the UCC28C44DG4 features an integrated PWM dimming mode that eliminates the need for additional dimming circuitry in power supplies with multiple power stages.

The working principle of the UCC28C44DG4 is based on a high and low-side MOSFET driver also referenced as a gate driver. The gate driver uses a charge pump in order to generate the high voltage (Vgs) needed to turn on the MOSFET. The gate driver is typically placed between the control circuit and the power transistor to provide the necessary voltage level shift, drive voltage and current, and additional protection features. The gate driver also protects the control circuit by isolating it from the high voltage present at the power transistor.

The two driver outputs of the UCC28C44DG4 are synchronized to prevent shoot-through current, an effect which could damage the external MOSFETs. The high-side and low-side driver outputs feature a selectable slew rate control, which allows the user to adjust the slew rate of the MOSFETs\' gate voltage to obtain optimal performance for the application. The output current limit for both drivers is factory trimmed allowing the user to select the current-limit level directly from the device. This feature simplifies the design process, as no external components are required to set the current-limit level.

In summary, the UCC28C44DG4 is an excellent choice for offline applications requiring a dual high and low-side gate driver. It supports output current up to 2A peak and 1.5A continuous, making it an ideal choice for applications requiring superior driver performance. The integrated fault protection features and PWM dimming mode ensure maximum power dissipation and long term reliability. The UCC28C44DG4\'s two outputs are synchronized to prevent shoot-through current and feature a selectable slew rate to obtain optimal performance.

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