This document describes a low-line 8 W dimmable LED driver reference design using the CY8CLEDAC02 AC-DC power controller device. This design is capable of driving five white LEDs with a typical load voltage of 16.5 V at 400 mA.
The CY8CLEDAC02 is a high performance offline LED driver, designed to interface directly with most conventional phase-cut based wall dimmers. The device uses proprietary digital control technology to provide automatic detection of dimmer type (leading- or trailing-edge). It automatically generates dimming signals for LED loads and has the ability to dim down to 2 percent. It modulates LED brightness using a linear dimming scheme and switches to a PWM based dimming scheme for output current levels lower than 20 percent of the full load current. In PWM mode, optimized dimming frequencies in the range of 900 Hz result in zero visible flicker.
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