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