IRPLDIM2U International Rectifier, IRPLDIM2U Datasheet - Page 5

• Manufacturer Part Number: IRPLDIM2U
• Description: BALLAST DIM DIG 32W/T8 120VAC
• Manufacturer: International Rectifier

Specifications of IRPLDIM2U

• Main Purpose: Lighting, Ballast Control
• Utilized Ic / Part: IR21592
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -
• Lead Free Status / Rohs Status: Not Compliant
• Other names: *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-
mation by the signal Lamp-out, connected to
the lamp.
www.irf.com
Interfac
Optos
with
e
from the network
TR data signal
to the micro
RX data signal
from the micro
to the network
Fig. 4 Micro/IR21592 Communication
1
2
3
4
5
6
7
8
9
RA5
VSS
RB0
RB2
RB3
RA2
RA3
RA4
RB1
VDD
RA1
RA0
RA7
RA6
RB7
RB6
RB5
RB4
If 0 Lamp OK
If 1 Lamp Fault
18
17
16
15
14
13
12
11
10
R25
VSS
C17
R16
C11
VDD
R17
1.25V
3.75V
2.5V
If 0 IC OFF
If 1 IC OK
RDIM
TURN OFF IC
TURN ON IC
1
2
3
4
5
6
7
8
VDC
VCO
CPH
DIM
MAX
MIN
FMIN
IPH
Lamp
Out
IRPLDIM2U
COM
VCC
HO
VS
VB
LO
CS
SD
16
15
14
13
12
11
10
9
5