IRPLDIM2U International Rectifier, IRPLDIM2U Datasheet - Page 3

• 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

FUNCTIONAL DESCRIPTION
The IRPLDIM2U 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.
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 IRPLDIM2U 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.
www.irf.com
PC
NOTE: Ballast can also be
connected directly to a DALI
compliant system..
PC and RS232/DALI converter
are used for demo purposes.
converter
RS232/
DALI
N
E
L
DALI
input
IRPLDIM2 Reference Design
Interface
Interface
OPTO
Fig. 3 IRPLDIM2 Block diagram
EMI Filter
1
2
3
4
5
6
7
8
9
RA5
RB0
RB2
RB3
RA2
RA3
RA4
VSS
RB1
Micro
VDD
RA1
RA0
RA7
RA6
RB7
RB6
RB5
RB4
18
17
16
15
14
13
12
11
10
Fault condition
actual level
light status
Fade time
Fade rate
light level
ballast
On/Off
Rectifier
1
2
3
4
5
6
7
8
VDC
VCO
CPH
DIM
MAX
MIN
IPH
IR-IC
FMI
N
VCC
HO
CO
CS
SD
VS
VB
LO
M
16
15
14
13
12
11
10
9
PFC
Half Bridge
Dimming Feedback
Preheat Feedback
Driver
Lamp Fault
Output Stage
IRPLDIM2U
Lamp
3