UCC28811DR Integrated Circuits (ICs)

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The UCC28811DR is an advanced power supply management IC for LED lighting applications. It is a monolithic, synchronous dual-mode, high-power tracking regulator designed to drive a wide number of LED strings in a variety of dimming scenarios. It integrates dual 4A/2A buck regulators with 15V/3V linear regulators, power MOSFETs, and digital control logic, reducing external component count and simplifying system design. The UCC28811DR is ideal for LED lighting applications with its integrated dimming and over-temperature protection features.

The UCC28811DR features a wide input voltage operating range of 4.5V to 38V, making it suitable for various low/high input voltages power sources. This power IC has two distinct operating modes: adaptive mode and dynamic mode. In adaptive mode, the peak current of each buck converter is set by the value provided by the feedback capacitors. When the feedback capacitors reach a certain threshold, the voltage across them is sensed and the peak current is adjusted accordingly. This adaptive mode allows for a dynamic and efficient power delivery from the input rail.

In dynamic mode, the peak current is set by the input RMS current at the VDD pin. The current amplitude is modified by adjusting its PWM duty cycle and operating frequency. This mode can be used when driving higher currents that may cause additional heat dissipation on the feedback capacitors. The integrated linear LDO regulator with a 3V/15V output voltage range can be used to supply low current to other devices, such as the controller. Additionally, the UCC28811DR incorporates an adjustable primary side MOSFET dissipative current limiting feature, allowing the user to adjust the maximum output current according to the application requirements.

The UCC28811DR also integrates a temperature controlled, digital dimming control which can be flexibly configured using external components. It also features programmable soft-start and constant frequency, current-mode-operation that reduces EMI and improves system reliability. In addition, the device offers an open load short circuit protection for both poles of the output, as well as an under voltage lock out feature to ensure system safety during battery operation.

In summary, the UCC28811DR power management IC for LED lighting applications is a versatile device that can be configured for a variety of different LED applications. Its dual-mode operation allows for an efficient and accurate power delivery from the input rail, while its integrated dimming and protection features ensure a safe and reliable system that is optimized for performance and energy savings. This device is a cost-effective solution and is suitable for a host of low to high power LED lighting applications.

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