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PDF AN809 Data sheet ( Hoja de datos )
| Número de pieza | AN809 | |
| Descripción | Digitally Addressable DALI Dimming Ballast | |
| Fabricantes | Microchip | |
| Logotipo |  |
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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
1 page  
AN809
Digital Control
The digital control section is built around the Microchip
PIC16F628 microcontroller. This microcontroller acts
as an interface between the IR2159 ballast controller
and the DALI. Data is transmitted to the unit and the
PIC16F628 collects the data through an isolation cir-
cuit. The PIC16F628 then interprets the data and
sends the appropriate signals to the ballast controller,
IR2159 as necessary or sends information back to the
DALI. The PIC16F628 also performs FAULT detection
and disables the IR2159, if a FAULT is present.
BALLAST DESIGN
The ballast design incorporates two parts, hardware
and software. The ballast controller design portion
incorporates most of the hardware design. The digital
design control portion incorporates most of the soft-
ware design. Appendix A shows the complete sche-
matic and Appendix B lists the Bill of Materials.
The Ballast Controller Design
The design of the ballast control portion of the circuit
has been accomplished in International Rectifier’s Ref-
erence Design IRPLDIM1. Refer to this for waveforms
and specific calculations regarding the ballast control-
ler portion of this design.
Signals of the IR2159
The communication between the microcontroller and the
IR2159 is done with four signals, as shown in Figure 4.
These signals are used for digital dimming (RB3), turn-
ing the ballast on or off (RB4) and FAULT detection (RB5
and RB6). The microcontroller controls the IR2159 by
the following three pins: pins SD for shutdown of the IC
(active high), FMIN used for FAULT detection (0 if the IC
is in FAULT mode) and DIM to control the brightness.
The microcontroller receives lamp information by the
signal LAMP_OUT, connected to the lamp.
The shutdown signal (RB4) enables or disables the
IR2159. When high, the lamp is off and the IR2159 is
disabled with minimal current flowing. When low, the
lamp is on. The PIC16F628 has control of this line and
determines if lamp should be on or off based on FAULT
conditions and user requested settings from the DALI.
FIGURE 4: MICROCONTROLLER / IR2159 COMMUNICATION
VDD LLAMamPOpUTOut
TR data signal
from the network
to the micro
Interface
with
Optos
RX data signal
from the micro
to the network
If 0 Lamo OK
If 1 Lamp Fault
1 RA2
2 RA3
3 RA4
4 RA5
5 VSS
6 RB0
7 RB1
8 RB2
9 RB3
RA1 18
RA0 17
RA7 16
RA6 15
VDD 14
RB7 13
RB6 12
RB5 11
RB4 10
R25
VSS
R17
R16
C11
1 VDC
HO 16
2 VCO
VS 15
RDIM
3 CPH
4 DIM
VB 14
VCC 13
5 MAX
COM 12
If 0 IC OFF
If 1 IC OK
6 MIN
7 FMIN
LO 11
CS 10
8 IPH
SD 9
TURN ON IC
TURN OFF IC
C17 1.25V
2.5V
3.75V
© 2002 Microchip Technology Inc.
DS00809B-page 5
5 Page 
APPENDIX A: IRPLDIM2 SCHEMATIC
FIGURE A-1: IRPLDIM2 SCHEMATIC
AN809
IR2159
PIC16C628
© 2002 Microchip Technology Inc.
DS00809B-page 11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet AN809.PDF ] | |
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