IRPLDIM2E
FUNCTIONAL DESCRIPTION
The IRPLDIM2E Demo Board consists of an EMI filter, an active power factor correction front end, a ballast
control section, a digital control section and a resonant lamp output stage. A block diagram of the design is shown
in Figure 3.
The EMI filter blocks ballast generated noise. The power factor correction is used for sinusoidal input current and
a regulated DC bus. The ballast control section provides frequency modulation control of a traditional RLC lamp
resonant output circuit for preheating, igniting and ballasting the lamp. It is easily adaptable to a wide variety of
lamp types. The digital control section provides the Digitally Addressable Lighting Interface (DALI) and the neces-
sary circuitry and software to perform closed-loop dimming, lamp fault detection, shutdown and auto-restart.
L
EMI Filter
Rectifier
PFC
Output Stage
N
E
18
PC
RS232/
DALI
DALI
input
Interface
OPTO
Interface
1
2
3
RA2
RA3
RA4
Micro
RA1
RA0 17
RA7 16
light level
Fade time
Fade rate
On/Off
1
2
3
IR-IC
VDC HO
VCO VS
CPH VB
16
15
14
Half Bridge
Driver
Lamp
13
12
11
converter
NOTE: Ballast can also be
4 RA5
5 VSS
6 RB0
7
RB1
8 RB2
RA6 15
VDD 14
RB7
RB6
RB5
Fault condition
actual level
light status
ballast
4
5
6
7
8
DIM
MAX
MIN
FMI
N
IPH
VCC
CO
M
LO
CS
SD
13
12
11
10
9
Dimming Feedback
Preheat Feedback
10
connected directly to a DALI
compliant system..
9 RB3
RB4
Lamp Fault
PC and RS232/DALI converter
are used for demo purposes.
IRPLDIM2 Reference Design
Fig. 3 IRPLDIM2 Block diagram
You can connect the board directly to the DALI input (2 connections) or you can use the RS232/DALI converter
board (for demo purposes with the IRPLDIM2E board) to connect it to the PC.
The ballast control circuit uses the IR21592 Dimming Ballast Control IC programmed by the PIC16F628
microcontroller. The IR21592 controls the ballast according to the signals received from the microcontroller. The
microcontroller is connected to the ballast and the IC to receive diagnostic signals.
The communication between the ballast and the external world is done with two signals: TX (digital serial signal
transmitted from the network to the microcontroller) and RX (digital serial signal from the microcontroller to the
network). This system allows the ballast to communicate bi-directionally with the network (a PC or generally a
DALI system). A digital interface assures high voltage isolation between DALI inputs and the resonant lamp output
stage. The microcontroller manages the communication between interface and ballast IC.
The complete circuit is shown in Appendix A. In the circuit thick races represent high frequency and high current
paths. Lead lengths should be minimized to avoid high-frequency noise problems. Appendix B shows the Bill of
Materials.
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3
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