AN3212 Datasheet, PDF (1/36 Pages) STMicroelectronics – The driving idea behind this application note is to exploit the possibility

AN3212
Application note
5 W to 7 W high power factor offline LED driver
based on VIPer devices
Introduction
The driving idea behind this application note is to exploit the possibility of implementing an
LED power supply module characterized by a high power factor, based on devices from the
VIPer family in flyback configuration and with a TSM1052 as a constant current controller.
The other key point is to avoid using high voltage electrolytic capacitors, evaluate the
influence of the output bulk electrolytic capacitor on overall performance, and consider its
replacement with much smaller ceramic components, eventually implementing a non
electrolytic configuration.
The STEVAL-ISA120V1 demonstration board has been designed as a platform to perform
this evaluation.
Figure 1. STEVAL-ISA120V1 VIPer27 LED driver module
March 2013
DocID17427 Rev 2
1/36
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