IRPLDIM2U Datasheet, PDF (5/13 Pages) International Rectifier – Digital Dimming DALI Ballast for 32W/T8 110V input

IRPLDIM2U
BALLAST DESIGN
The ballast design incorporates two parts, hardware and software. The ballast controller design portion incorpo-
rates most of the hardware design. The digital design control portion incorporates most of the software design.
Appendix A shows the complete schematic and Appendix B 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 Reference
Design IRPLDIM1. Refer to this for waveforms and specific calculations regarding the ballast controller portion of
this design.
Signals of the IR2159
The communication between the microcontroller and the IR21592 is done with four signals, as shown in Fig. 4.
These signals are used for digital dimming (RB3), turning the ballast on or off (RB4), and fault detection (RB5 &
RB6). The microcontroller controls the IR21592 by the following 3 pins: pin SD for shutdown of the IC (active high),
pin FMIN used for fault detection (0 if the IC is
in fault mode) and pin DIM to control the bright-
ness. The microcontroller receives lamp infor-
Lamp
VDD
Out
mation by the signal Lamp-out, connected to
R17
the lamp.
If 0 Lamp OK
R16
If 1 Lamp Fault
1 VDC
2 VCO
HO 16
VS 15
1 RA2
2 RA3
3 RA4
RA1 18
RA0 17
RA7 16
C11
3 CPH
VB 14
RDIM
4 DIM
VCC 13
5 MAX
COM 12
TR data signal
from the network
to the micro
Interfac
weith
Optos
RX data signal
from the micro
to the network
4 RA5
5 VSS
6 RB0
7 RB1
8 RB2
9 RB3
RA6 15
VDD 14
RB7 13
RB6 12
RB5 11
RB4 10
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
R25
C17
VSS
1.25V
2.5V
3.75V
Fig. 4 Micro/IR21592 Communication
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