Title :
A fully-integrated, 90% peak efficiency, 0.99 power factor, AC-DC LED Driver with on-chip direct-AC-connect series startup pre-regulator
Author :
Neyra, Percy ; Al-Shyoukh, Mohammad
Author_Institution :
TSMC, Austin, TX, USA
Abstract :
In this paper, a fully-integrated AC-DC flyback converter for LED lighting applications is demonstrated. With the exception of passives, magnetics and rectification diodes, the entire AC-DC power converter including the ultra high voltage (UHV) power FET, control loop, current sensing, and startup functions have been integrated on the same monolithic bulk-CMOS silicon die. The startup function employs an 800 V depletion-mode pass device as part of a direct-AC-connect self-biased series pre-regulator. The entire AC-DC converter occupies an active area of 12.7 mm2 on silicon, and has a peak efficiency of 90% for a 15 W LED load. A control loop architecture employing critical conduction mode (CrM) with line voltage feed-forward enables near-unity power factor performance.
Keywords :
AC-DC power convertors; CMOS integrated circuits; driver circuits; light emitting diodes; power factor; power field effect transistors; rectification; silicon; AC-DC LED driver; AC-DC flyback converter; AC-DC power converter; LED lighting; Si; UHV power FET; control loop architecture; critical conduction mode; current sensing functions; depletion-mode pass device; monolithic bulk-CMOS silicon die; power 15 W; power factor; rectification diodes; size 12.7 mm; startup functions; ultra high voltage power FET; voltage 800 V; Field effect transistors; Light emitting diodes; Lighting; Logic gates; Rails; Resistors; Voltage control; AC-DC Converter; LED Driver; Power Factor; Pre-regulator; Startup;
Conference_Titel :
Custom Integrated Circuits Conference (CICC), 2014 IEEE Proceedings of the
Conference_Location :
San Jose, CA
DOI :
10.1109/CICC.2014.6946094
