UCC38085DR

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UCC38085DR is a high-current, high-efficiency AC-DC converter especially suitable for offline non-dimmable LED lighting applications, power supplies and converters. It is a highly integrated, cost-effective and compact full bridge off-line AC-DC switch mode power supply (SMPS) solution featuring high power-factor correction (PFC), universal input voltage operation and excellent line and load regulation.

The UCC38085DR provides an effective solution for a wide range of LED lighting, motor control and power supply applications. It is fully compatible for up to 250V AC mains, with a wide DC input voltage range that enables flexibility for adapter designs and helps reduce physical size. The highly integrated design helps enable cost savings when compared to conventional solutions.

The UCC38085DR utilizes a full-bridge design, with the provision for single-stage power factor correction. It incorporates all the essential functionality required to realize switch mode power supplies, including the needed components for the bridge rectifier, PFC, AC line voltage sensing and regulation, DC link voltage monitoring, HV startup circuit with reduced current ramp, and Overtemperature and Overvoltage protection.

The UCC38085DR features an integrated 700V MOSFET and Thyristor power switch that provides up to 15A of output current. Its innovative high-voltage startup circuit and adjustable current ramp help reduce startup delay time and the inrush current at startup, respectively. The device incorporates a low-cost, balance load current sensing circuit that allows it to achieve high efficiency without the need for an optocoupler.

UCC38085DR also features high-voltage output control, line and load regulation, dimming function, soft-start, and a diagnostic output for thermal protection and overload detection. Its integrated HV startup circuit allows it to start rapidly without high-voltage startup circuits. Other features include programmable PFC frequency, selectable burst operation, phase angle control and minimum load operation.

UCC38085DR works on the principle of AC-DC switching and PFC control. When the AC line voltage input is applied, the rectifier converts it into a DC voltage. This is followed by the PFC control stage which increases the input power factor in order to limit current harmonics and power dissipation. The controlled DC voltage output is then used to drive the primary winding of a transformer and generate the output voltage. The switching stage is then used to control the output voltage and regulate the current at the output.

UCC38085DR is an ideal cost-effective and compact solution for high-efficiency AC-DC offline non-dimmable LED lighting, motor control, and power supply applications. It is an excellent choice for designers looking for a flexible, small footprint, and high-performance SMPS solution.

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