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Digital high power factor XDPTM controller for cost-effective flyback LED drivers

Infineon Technologies AG (FSE: IFX / OTCQX: IFNNY) introduces the XDPTM digital power XDPL8219. The high-performance flyback controller features secondary-side regulation for high-performance and robust LED designs. It provides high power factor and constant voltage output. The unit operates in quasi-resonant mode (QRM) to maximize the efficiency and reduce the electromagnetic interference (EMI) over a wide load range. It accommodates active burst mode (ABM) at light load to avoid audible noise while achieving a no-load standby power level below 100 mW.

The XDPL8219 detects the input voltage type (AC or constant DC) and adjusts its proprietary voltage-mode pulse modulator accordingly for enhanced system performance. For AC input, it alters the heart beat modulation for achieving a high power factor (>0.9) as well as low total harmonic distortion (<10%) over a wide input and cargo range. For a constant DC input, adapting pulse modulation results in an adjusted switching frequency hence reducing EMI within the entire operating range.

The device provides maximum design flexibility and gratifaction optimization through parameter configuration via a universal asynchronous receiver transmitter (UART) pin. Furthermore, the XDPL8219 optionally transmits UART signals to see about input voltage, line frequency, controller temperature, last error code, and input voltage loss indication and others. Infineon provides programming tools, including a user-friendly graphic user interface to configure the controller. This increased flexibility together with reduced bill-of-materials shortens time-to-market.


The XDPL8219 is housed in a DSO-8 package with a built-in 600 V HV start-up cell and a proprietary start-up sequence. This ensures a quick output voltage rise with minimal overshoot. The XDPL8219 could be ordered now.