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IRPLDIM2E
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-
mation by the signal Lamp-out, connected to
VDD
R17
Lamp
Out
the lamp.
1
VDC
HO
16
If 0 Lamp OK
R16
If 1 Lamp Fault
C11
2
3
VCO
CPH
VS
VB
15
14
1
2
RA2
RA3
RA1
RA0
18
17
RDIM
4
DIM
VCC
13
3
RA4
RA7
16
5
MAX
COM 12
TR data signal
from the network
to the micro
4
5
RA5
VSS
RA6
VDD
15
14
If 0 IC OFF
If 1 IC OK
6
7
MIN
FMIN
LO
CS
11
10
6
RB0
RB7
13
7
RB1
RB6
12
8
IPH
SD
9
Interfac
8
RB2
RB5
11
TURN ON IC
e
with
RX data signal
from the micro
9
RB3
RB4
10
TURN OFF IC
Optos
to the network
R25
www.irf.com
C17
VSS
Fig. 4 Micro/IR21592 Communication
1.25V
2.5V
3.75V
5
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相关PDF资料
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相关代理商/技术参数
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IRPLHID1U
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