AN4382 Datasheet, PDF (1/70 Pages) STMicroelectronics – 100 W LED street lighting application using STLUX385A

AN4382
Application note
100 W LED street lighting application using STLUX385A
Ambrogio D’Adda, Francesco Ferrazza
Introduction
The STEVAL385LEDPSR demonstration board is a complete and configurable solution that
manages a single high brightness LED string using the STLUX385A digital controller and
two stages of power conversion. The application consists of a PFC regulator followed by
a zero voltage switching (ZVS) LC resonant stage. The LED current is adjusted using
a primary side regulation (PSR) control technique. The LED brightness can be dimmed by
controlling the LED current down to a very low level. Communication interfaces like DALI
and UART are present, as well as an insulated 0 - 10 control input. This application note
describes the use of the STEVAL385LEDPSR demonstration board, the hardware design
and the firmware implementation. A real measurement is also described. For complete
information on the STLUX385A digital controller, please refer to STLUX385A datasheet.
Danger:
High voltage is present on the PSR-ZVS demonstration
board.
Caution:
This board shall be used by qualified and knowledgeable people due to internal high
voltage. The user shall take great care when handling the demonstration board, even when
no power is supplied.
February 2014
DocID025437 Rev 1
1/70
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