Datasheet

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Scope

The requirements for a modern AVR include a slim physical profile and the ability to operate from the ac-

line input at close to unity power factor. Therefore, an AVR application demands the power supply be of

low height, and comply with the power quality requirements defined in the IEC standard, 61000-3-2. In

addition, the combination of a tight physical package and the desire to meet Energy Star™ guidelines

requires that the design also demonstrates high efficiency. Described herein is a practical design that uses

standard components. It achieves the requirements using a traditional two-stage power converter topology

along with state-of-the-art power circuit control methods. The first stage is an interleaved, transition-mode,

power factor correcting (PFC) boost pre-regulator. This is followed by an isolated LLC series resonant DC-

DC main converter.

The design takes advantage of three integrated circuit power controllers.

• The PFC pre-regulator stage is controlled by the UCC28061, a dual-phase, interleaved, transition-

mode PFC controller.

• The resonant LLC converter uses the UCC25600; a low-cost 8-pin controller.

• The third IC is the UCC28600. This is used to control a small 6-W flyback converter that provides a

bias supply voltage.

2 Scope

This user guide is intended to demonstrate the design of the functional circuit, the operation of which has

been verified through a limited number of performance tests. This circuit incorporates essential safety

features. These include an input line fuse, inrush current control, output over-current limit, and output

over-voltage protection.

Electromagnetic compatibility (EMC) has been taken into account during circuit selection and PCB layout

design. For most applications, the EMI filter components used are sufficient, but different housing and

different harness wiring and amplifier sections demands a need for filter adjustments to meet applicable

environmental and system compatibility requirements.

SLOU293C–June 2010–Revised September 2012 A 600-W, Isolated PFC Power Supply for AVR Amplifiers Based on the

TAS5630 and TAS5631

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