-14

Ballast Demonstrator User Guide

7629A–AVR–04/06

If lamp currents exceed power limits by 10% (as determined by lamp type), set half-

bridge drive off due to over current. Start re-ignition sequence. Repeat 6 times and if still

out of spec, shutdown PFC and half-bridge drive.

PD6 rectified AC drive

Checks are made for the presence of the rectified mains (haversine) and bus voltage

throughout normal operation. Mains voltage < 90 VAC or 265 VAC peak faults the PFC

to off, turns off the half-bridge and initiates a restart.