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  Microchip Technology Semiconductor Electronic Components Datasheet  

AN809 Datasheet

Digitally Addressable DALI Dimming Ballast

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AN809 pdf
AN809
Digitally Addressable DALI Dimming Ballast
Authors:
Ross Fosler
Microchip Technology Incorporated
Cecilia Contenti
International Rectifier
Tom Ribarich
International Rectifier
INTRODUCTION
This reference design is a high efficiency, high power
factor and digital dimming electronic ballast designed to
drive rapid start fluorescent lamp types. The design
contains an active power factor correction circuit for
universal voltage input as well as a ballast control cir-
cuit using the IR2159. The design also includes a
PIC16F628 microcontroller and an isolation circuit for
connecting to a Digitally Addressable Lighting Interface
(DALI). Other features include EMI filtering, transient
protection and lamp FAULT protection.
International Rectifier (IR) and Microchip Technology
Inc. worked together to design a DALI type ballast. An
application note is provided here, and the correspond-
ing reference design is available from IR (see page 10
for ordering information).
This document describes many of the details within the
design of the ballast and some of the basics to DALI.
However, this document does not describe all the
details contained within the DALI specification. The
reader should be familiar with DALI and international
standard EN60929.
FIGURE 1: DALI DIMMING BALLAST
Features
• Lamp Type: 1X 36W T8 Lamp (IRPLDIM2E)
• 1X 32W T8 Lamp (IRPLDIM2U)
• Line Input: 185-265 VAC/50Hz (IRPLDIM2E)
• 90-140 VAC/60Hz (IRPLDIM2U)
• Interface DALI (2 wires)
• High Power Factor/Low THD
• High Frequency Operation
• Programmable Lamp Filament Preheating
• Programmable Ignition
• High precision Digital Dimming
• Logarithmic Dimming
• Diagnostic and FAULT Control
• Lamp FAULT Protection
• Brown-out Protection
• IR2159 HVIC Ballast Controller
• PIC16F628 Microcontroller
• Optically Isolated Communications
• Low Power Standby Mode
© 2002 Microchip Technology Inc.
DS00809B-page 1


  Microchip Technology Semiconductor Electronic Components Datasheet  

AN809 Datasheet

Digitally Addressable DALI Dimming Ballast

No Preview Available !

AN809 pdf
AN809
Digitally Addressable Lighting Interface
(DALI)
The Digital Addressable Lighting Interface (DALI),
international standard prlEC929 is a communication
protocol and method to interface lighting units on a 2-
wire network. The DALI protocol is 16 bits and supports
addressing up to 64 ballasts individually, 16 groups, or
broadcasting to the entire lighting network. Aside from
the protocol, DALI supports fading, logarithmic dim-
ming, scenes, and FAULT detection.
The DALI allows a complete lighting environment to be
controlled and managed efficiently. The DALI can con-
trol (transmit and receive) up to 64 different ballasts
with the same control system, transmitting instructions
to single ballasts or to a group of ballasts. The ballast
FIGURE 2: DIMMING CHARACTERISTICS
provides eye sensitive dimming over a wide range (1-
100%). Various operating parameters can be changed
and stored dynamically within the ballast memory. For
example, scene levels can be set for different groups of
ballast. In addition, maximum brightness, minimum
brightness, fade-time, and several other features can
be set as desired. Another feature is the ability to diag-
nose problems such as lamp failures.
Perfect Light Quality
By means of digital control, the light level can be
adjusted according to individual lighting needs. The
DALI includes 256 levels of brightness and a logarith-
mic dimming curve (Figure 2). The use of this curve
allows for better control at lower light levels where the
human eye is more sensitive.
Dim value
255
240
225
210
195
180
165
150
135
120
105
90
75
60
45
30
15
0
0 10 20 30 40 50 60 70 80 90 100
Relative lighting level %
DS00809B-page 2
© 2002 Microchip Technology Inc.


Part Number AN809
Description Digitally Addressable DALI Dimming Ballast
Maker Microchip
Total Page 18 Pages
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