UCC2581DG4

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The UCC2581DG4 is a voltage regulator integrated circuit that is part of the PMIC - Voltage Regulators - DC DC Switching Controllers family. It provides a high level of performance and reliability for any power conversion solution. With its many features and high efficiency, it is an ideal choice for a wide range of applications.

The UCC2581DG4 is a synchronous rectified, zero voltage switching (SR/ZVS) DC-DC converter controller that provides a smooth transition between constant voltage (CV) and constant current (CC) mode operation. In CV mode, the output voltage is regulated around a setpoint voltage to provide a constant voltage power supply. The output current is regulated in CC mode, which is the default operating mode. The device also offers a wide range of operating frequencies, adjustable step up and step down voltage levels and advanced programmable system protection features.

The UCC2581DG4 has a wide operating environment temperature range of -40 °C to 85 °C. It is designed with a 6-bit voltage dividers on the output voltage programming pin that allows the output voltage to range from 1.175V up to 75V. Its highly efficient operation up to 96% and quick transient response to the load change make it suitable for power and voltage regulation in both CV and CC mode. Its extensive diagnostic capabilities are executed during startup, as well as during normal operation and provide feedback to the system when a fault occurs.

The UCC2581DG4 is used for many different applications. It is used in automotive and industrial power systems for powering DC motors, pumps, fans and other components. It is also used in DC-DC point-of-load converters and telecom applications. Additionally, it is used in board mounted power regulators and many other applications.

The operating principle of the UCC2581DG4 is based on a synchronous rectifier/zero voltage switching topology. This topology consists of an input voltage, a pair of voltage inputs V1 and V2, a pair of switches S1 and S2, and a transformer. The switches S1 and S2 are connected in series with a pair of synchronous rectifier diodes D1 and D2 in the collector of each switch. When the device is in CC mode, the switches are used in a 1-0-0-1 switching pattern and switch when the current switches from one diode to the other. This allows for a continuous operating frequency, increasing efficiency and reducing switching losses.

In CV mode, the UCC2581DG4 operates using an analog phase-shifted full bridge (APSFB). The purpose of this topology is to reduce the switching losses and the output voltage ripple. The APSFB uses two switch pairs S1 and S2 and S3 and S4 connected to the primary of a transformer. As the switches turn on, current through the transformer is increased. When the current reaches a certain threshold, the switches are turned off and the energy stored in the transformer is released. This allows for a more efficient energy conversion and a reduced voltage ripple.

In summary, the UCC2581DG4 is part of the PMIC - Voltage Regulators - DC DC Switching Controllers family and is used for many power conversion solutions. It is highly efficient, has a wide operating temperature range and supports both CV and CC mode operation. Its APSFB topology reduces the switching losses and the output voltage ripple, making it an ideal choice for many applications.

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