Ballast Demonstrator User Guide
-1
7629A–AVR–04/06
Section 1
Introduction ........................................................................................... 1-1
1.1
General Description .................................................................................1-2
1.2
Ballast Demonstrator Features ................................................................1-2
Section 2
Ballast Demonstrator Device Features ................................................ 2-5
2.1
Atmel Supported Products .......................................................................2-5
2.2
IXYS Supported Products ........................................................................2-5
Section 3
Ballast Description ............................................................................... 3-7
3.1
Circuit Topology .......................................................................................3-7
3.1.1
Line Conditioning ...............................................................................3-7
3.1.2
Low Voltage Supply ...........................................................................3-7
3.1.3
PFC Boost Regulator .........................................................................3-8
3.1.4
PFC Magnetics ..................................................................................3-8
3.1.5
Lamp Drive ........................................................................................3-8
3.1.6
Control ...............................................................................................3-8
3.1.7
IXYS IXI859 Charge Pump Regulator ...............................................3-9
3.1.8
IXYS IXTP02N50D Depletion Mode MOSFET used ..........................3-9
3.1.9
IXYS IXD611 Half bridge MOSFET driver .......................................3-10
3.1.10 IXYS IXTP3N50P PolarHV N-Channel Power MOSFET .................3-10
Section 4
Circuit Operation ................................................................................. 4-11
4.1
PFC ........................................................................................................4-11
4.1.1
PFC Sequence ................................................................................4-12
4.2
Lamp Circuit ...........................................................................................4-12
4.2.1
General ............................................................................................4-12
Section 5
AT8xEB5114 Non-dimmable Software ............................................... 5-15
5.1
Main_AT8xEB5114_fluo_demo.c ..........................................................5-17
5.1.1
ADC STATE MACHINE ...................................................................5-17
5.2
Pfc_ctrl.c ................................................................................................5-19
5.2.1
PFC STATE MACHINE ...................................................................5-19
5.3.1
Lamp State Machine ........................................................................5-21
Section 6
Conclusion ......................................................................................... 6-23
