IRPLCFL3 International Rectifier, IRPLCFL3 Datasheet - Page 4

• Manufacturer Part Number: IRPLCFL3
• Description: KIT DESIGN CFL TRIAC DIMMING
• Manufacturer: International Rectifier

Specifications of IRPLCFL3

• Main Purpose: Lighting, Ballast Control
• Utilized Ic / Part: IR2156
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -
• Other names: *IRPLCFL3

A snubber has also been included consisting of C2 and R2. The purpose of this is to
reduce ringing caused by the resonance of the series inductors and load capacitances
when the dimmer triac fires. R1 is also essential in achieving this and it is important to
select L1 such that it has a DC resistance of about 5 Ohms to provide additional
damping. If the series resistance is too low the ballast will not be stable at low dimming
levels.
SCHEMATIC DIAGRAM
Phase Cut Voltage and Current
IRPLCFL3
LINE VOLTAGE
THROUGH
PHASE CUT
DIMMER
120VAC
120VAC
LINE
Voltage at Ballast Input
Current at Ballast Input
R5
R4
L1
R1
C1
C3
C2
R2
C4
R6
C5
C6
D3
D1
D2
D4
R8
R7
R13
D6
D5
R10
5
6
2
3
R12
IC1a
R11
8
4
R9
C7
C8
7
IC1b
1
D7
R3
R18
R15
R16
R17
C9
VCC
VDC
RPH
CPH
NC
RT
CT
C10
1
2
3
4
5
6
7
IC2
D8
C21
14
13
12
11
10
9
8
COM
VB
HO
VS
LO
CS
SD
C20
C11
R19
Q1
Q2
R20
C13
D10
L2
C19
R21
C14
D9
R22
C15
R22
C12
C16
D11
R14
C18
C17
D12
L2a
L2b
4