IRS21571DSPBF International Rectifier, IRS21571DSPBF Datasheet - Page 19

• Manufacturer Part Number: IRS21571DSPBF
• Description: IC BALLAST CTRL 600V 16-SOIC
• Manufacturer: International Rectifier
• Type: Ballast Controllerr

Specifications of IRS21571DSPBF

• Frequency: 43.7 ~ 48.3 kHz
• Current - Supply: 10mA
• Current - Output: 180mA
• Voltage - Supply: 11.5 V ~ 15.6 V
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 16-SOIC (0.154", 3.90mm Width)
• Package: 16-lead SOIC Narrow
• Circuit: Fluorescent Ballast IC
• Offset Voltage (v): 600
• Output Source Current Min (ma): 180
• Output Sink Current Min (ma): 260
• Pbf: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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Lamp Protection & Automatic Restart Circuitry Operation
Four pins on the IRS21571D are used for protection, as shown in Figure 10 below. These are VDC (dc bus
monitor), SD (unlatched shutdown), CS (latched shutdown) and OC (CS+ threshold programming).
Figure 10: Lamp Protection & Automatic Restart circuitry block diagram with external component connection
FREQ
(KHz)
150
100
50
0
0
Figure 8: f
5
+V
(t
10
BUS
DEAD
R2
R1
OSC
R
OC
15
= 2.0 usec)
versus effective R
RT
C1
CPH
VDC
OC
DT
(K ohms)
20
1
2
7
8
7.6V
7.6V
50uA
3.0V
5.1V
25
1.0uA
5.1V
4.0V
CT=220pF,RDT=11K
CT=470pF,RDT=6.2K
CT=1nF,RDT=3K
30
VOLTAGE
UNDER-
DETECT
S
R
T
Q
Q
35
from oscillator
40
Q
Q
section
S
R
19
DETECT
OVER-
TEMP
T
R
Q
Q
Q
Q
CLK
FREQ
(KHz)
D
R
250
200
150
100
50
0
0
Figure 9: f
2.0V
5
0.2V
7.6V
(t
7.6V
10
DEAD
10
9
OSC
CS
SD
15
= 1.0 usec)
versus effective R
R3
RT
Q2
C2
R4
© 2008 International Rectifier
(K ohms)
20
lamp cathode
from lower
R
CS
R5
V
25
CC
IRS21571D
CT=220pF, RDT=5.6K
CT=470pF, RDT=2.7K
CT=1nF, RDT=1.2K
30
T
35
40