UCC25630-4DDBR Integrated Circuits (ICs)

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The UCC25630-4DDBR is a synchronous flyback DC/DC controller that is designed for high performance and small size for a variety of applications. It is one of the Power Management Integrated Circuit (PMIC) that comes under the Voltage Regulators – DC DC Switching Controllers family.

The primary function of the UCC25630-4DDBR is to provide power conversion from input voltage to the desired output voltage levels. The UCC25630-4DDBR uses a bus track mode to regulate the output voltage, which is also known as the Valley Switch Control or VSC Mode. This mode works by having a voltage across the MOSFET when switching is taking place and then pulls down the current of the switch when the load is constant.

This feature helps to minimize the on-state resistance and the power losses that occur during the switching operations. The UCC25630-4DDBR also helps to minimize the EMI/RFI radiation by keeping the switching rates on minimum, which also benefits from further power efficient switching. The maximum achievable efficiency of the UCC25630-4DDBR is up to 91% at 25W due to its very low loss control circuitry and low gate charge.

Features like integrated ultra-fast PWM functionality, adjustable high side current limit, adjustable deadtime, high voltage UnderVoltage Lockout (UVLO), programmable slope compensation and adjustable cycle-by-cycle current limit, makes the UCC25630-4DDBR an effective solution for all DC/DC switching applications. The wide operating temperature range of -40°C to 125°C, enables the device to be used in harsh environmental conditions.

For the run-time control of the system, the UCC25630-4DDBR uses a fault signal and an external resistor divider network. It will shut down the system when the voltage is above a certain threshold and provides a feedback signal for fast response and quick system diagnosis. The UCC25630-4DDBR also helps to reduce the EMI/RFI radiation levels by using a spread spectrum PWM feature.

For low output ripple and high stability, the UCC25630-4DDBR features a voltage loop with an optimized PI controller. The on-chip compensation allows for easy set-up and fast loop settling time. The wide range of 20mA to 1A regulating current makes the UCC25630-4DDBR suitable for a variety of supplies ranging from low-power applications to high-current applications.

In summary, the UCC25630-4DDBR is a high performance and cost-effective embedded PMIC solution for applications that require reliable and efficient power conversion. It is optimized for applications such as telecom power supplies, distributed power architectures, server power supplies, notebook adapters, automotive and industrial power systems.

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