XDP controller has secondary side regulation for robust LED design
Intended for cost-effective flyback LED drivers, the XDP digital power XDPL8219 is Infineon’s latest flyback controller. It features secondary-side regulation for high-performance and robust LED designs, says the company.
It operates in quasi-resonant mode (QRM) to maximise the efficiency and minimise EMI over a wide load range. Another feature is the accommodation of active burst mode (ABM) at light load to prevent audible noise and achieve a no-load standby power level below 100mW.
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 pulse modulation for achieving a high power factor (above 0.9) as well as low total harmonic distortion (less than 10 per cent) over a wide input and load range. For a constant DC input, adapting pulse modulation produces an adjusted switching frequency to reduce EMI over the entire operating range.
Parameters can be configured via a universal asynchronous receiver transmitter (UART) pin. The XDPL8219 optionally transmits UART signals to provide data on input voltage, line frequency, controller temperature, last error code and input voltage loss indication. Programming tools available include a user-friendly graphic user interface (GUI) to configure the controller.
The XDPL8219 is housed in a DSO-8 package with a built-in 600V HV start-up cell and a proprietary start-up sequence. According to Infineon, this ensures a fast output voltage rise with minimal overshoot.