42022

This 42022 Application Brief exists as a supplement to Application Note 63. When used with Application Note 63, this document contains all the necessary information to convert an ML4833 Evaluation Board into a low-cost, non-dimming 220V ballast. This power factor corrected, 60W non-dimming ballast operates over a 187 to 253V line, and is designed to RMS power two series connected F32T8 lamps. The 42022  design preserves the features of the dimming ballast.which include:

0.99 minimum power factor
Less than 10% THD
Programmable starting sequence for low glow
current and extended lamp life
Greater than 92% efficiency
On-chip thermal and lamp out detection circuitry
Power down threshold for GFI or end of lamp life
protection

The 42022  mode of operation used for preheating and striking of the lamps is the widely accepted variable frequency, non-
overlapping inverter topology. Specific details on power factor correction and resonant lamp network design can be obtained from Application Note 63.