UCC27425DG4

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UCC27425DG4 Application Field and Working Principle

The UCC27425DG4, referred to as the UCC27425, is an integrated gate driver, part of the PMIC—Gate Drivers family from Texas Instruments. This power management integrated circuit, or PMIC, is single-channel, isolated gate driver that provides excellent performance for CAN, PWM, and isolated AC/DC converters. It is optimized for low-voltage and high-load applications with waveform fidelity, leading to much better performances over competing solutions. In addition, the UCC27425 has several features that make it easier to use, such as integrated under-voltage lockout (UVLO) for the lower supply pin.

The features of the UCC27425 allows a wide range of uses in different sectors like automotive, industrial, consumer electronics and healthcare. For instance, this gate driver can be used in applications such as bus converters, isolated converters, isolated lighting or power supplies, isolated gate drivers, power line communications, and multi-level power converters.

The UCC27425 gate driver package is a 6-pin DFN package, and its features are the following:

• Available in an industry-standard 6-pin DFN package
• Input logic compatible with 5 V logic
• Rated for operation voltage from 4.5 V to 18 V
• Operating temperature range from -40 °C to 125 °C
• High-speed ESD protection up to 2.5 kV (HBM)

In terms of its working principle, the UCC27425 integrates an isolated power MOSFET, a temperature-compensated oscillator, UVLO, gate driver, and gate charge pump circuitry. The integrated power MOSFET is provided with an under-voltage lockout (UVLO) to ensure the gate voltage is not applied with the source-to-drain junction in an off condition. The oscillator is used to generate the timing for the internal clock for the charge pump circuit. The internal gate driver immediately pulls up the voltage at the gate of the MOSFET, and the internal gate charge pump circuitry provides the required number of charge cycles to fully enhance the MOSFET. The functionality of the UCC27425 also includes a precision voltage reference, a reference comparator, a timer, and a soft-start generator.

These features make the UCC27425 particularly appropriate for applications that require high noise immunity, such as industrial and automotive control systems. It is particularly suitable to be used in battery management systems, motor drives and motion control solutions, as well as isolated voltage applications. In addition, due to its built-in high-speed ESD protection, it is able to protect the system against high-energy ESD pulses and minimize degradation.

In summary, the UCC27425 is a single-channel, isolated power management integrated circuit, which is particularly appropriate for applications that require high noise immunity. With its several features and capabilities, it can be used in battery management systems, motor drives, motion control solutions and many other sectors. It is also highly reliable, thanks to its built-in high-speed ESD protection.

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