UCC28711DR Integrated Circuits (ICs)

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The Texas Instruments UCC28711DR is a high-performance, low-side current-mode, digital-controller AC-DC converter. It has an integrated high-side switch and is designed to control standard AC-DC power conversion with universal input and output, as well as boosted and flyback topologies. It provides superior efficiency over a wide range of load conditions, and requires few external components for operation. The UCC28711DR is offered in both SOT-23 and SOIC-8 packages.

Application Of UCC28711DR

The UCC28711DR is well-suited to many applications, including dimmable LED drivers, battery charging systems, industrial and medical, as well as consumer and communications applications. Its wide input and output voltage range make it suitable for virtually any low-side current-mode AC-DC converter application. The UCC28711DR is designed to provide a high degree of flexibility, allowing engineers to easily configure the power supply to match their system requirements.

Working Principle

The UCC28711DR is a low-side current-mode, digital-controller AC-DC converter. It is designed to control standard AC-DC power conversion with universal input and output, as well as boosted and flyback topologies. It operates in both continuous conduction mode (CCM) and discontinuous conduction mode (DCM) to allow maximum efficiency over a wide range of load conditions. In CCM, the current-mode control increases efficiency by using the voltage-mode control of the output voltage feedback path. In DCM, the voltage-mode control reduces switching losses and improves light load efficiency. The UCC28711DR packs many integrated features into a single chip, making it ideal for space-constrained applications.

The UCC28711DR integrates a 7-bit digital-to-analog converter (DAC), a high-side switch, undervoltage protection and a comprehensive digital soft start circuit, allowing the designers the flexibility to configure the part for various application requirements. Its high-side switch supports up to 500V input, allowing for higher output voltages than traditionally possible with traditional low-voltage regulators. Its configurable soft start and integrated undervoltage protection features protect the load or system from voltage or current spikes during start-up and during load transients.

The UCC28711DR\'s open-loop voltage mode control offers good overshoot and undershoot performance, low noise, and an transient response time of 65µs. Additionally, its external compensation circuit can be tuned for fast transient response, ensuring excellent load-transient regulation performance. The part also features precision power-on-reset circuitry to ensure reliable start-up and a safe-start function to protect against mis-wiring.

The UCC28711DR is designed to provide superior efficiency and performance in AC-DC conversion applications. It packs many features into a small package and requires few external components. It offers high input and output voltage range, configurable soft start, precision power-on-reset and safe-start functions, and it operates in both continuous conduction mode (CCM) and discontinuous conduction mode (DCM). With these features, the UCC28711DR is well-suited to applications such as dimmable LED drivers, battery charging systems, industrial and medical, as well as consumer and communications applications.

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