Filter
Top Products
Dimmable Light Ballast with Power Factor Correction, Rev. 1
Freescale Semiconductor 21
Chapter 3
Reference Design
3.1 Application Outline
The presented system is designed to control two parallel connected fluorescent lamps. The reference
design meets the following performance specification:
• Single board solution with MC68HC908LB8 microcontroller
• Supported power supply: 110V/60Hz and 230V/50Hz
•Low THD
• High power factor achieved using the PFC circuit
• Control techniques incorporating:
– Preheating
–Strike
– Run mode
• User interface (dimming level potentiometer, monitor mode interface)
• Flickering effect removal
• Lamp aging recognition
• Fault detection
– DC-bus under-voltage detection (software)
– DC-bus over-voltage detection (software)
– Ignition fault (software)
– Zero current fault (software)
3.2 Dimmable Light Ballast Characteristics
Table 3-1 provides the basic characteristics of the Dimmable Light Ballast Demo with PFC at 25°C and
400 V DC-bus voltage.