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9-1
9. FLUORESCENT LAMP
INVERTER CIRCUIT
(For TLP511)
9-1. Operating Description
The base current at start-up passes through QI002,
RI003, RI004, RI009 and then flows into the base of
QI003. QI002 works as a ON/OFF switch for start-up
operation and turns ON when the base voltage develops
“L”. When the base voltage develops “H” (12V), QI002
turns off. A current flows into QI001 and RI002 only
when the start-up operation is carried out, thus improves
the start-up characteristics by increasing the base current
of QI003. Especially, this circuit takes effective under
the low temperature status where the start-up operation
is likely to difficult.
DI003, DI004 and DI005 connected to QI003 base
prevents an inverse break down overvoltage at QI003
V
BE
. DI003 and DI004 are connected in series to prevent
the overheat at short-circuiting.
When the resistor value of RI006 is small, heat genera-
tion of QI003 lowers. However, if the value is too small,
the current of DI003, DI004 and DI005 in continuity
becomes large.
DI002 increases only the base current of QI003 when it
turns on and reduces the V
CE
(sat) of QI003 to lower the
heat generation. RI005 works as a current limitation
resistor of DI002.
CI004 prevents a rapid increase of the collector current
of QI003 before the fluorescent lamp turns on.
Also, RI009 is a protective posistor to prevent QI003
from generating temperature more than 100°C.
The specification of LI002 is shown in Figs. 9-1-1, 9-1-2
and Table 9-1-1.
Fig. 9-1-2 Appearance and dimensions
Fig. 9-1-1 Winding specification
Table 9-1-1
No.
1
2
3
4
5
Coil
NP1
NP2
NP2
NP3
NP1
Terminal
5 – 4
3 – 2
9 – 8
10 – 9
7 – 6
Turns
24
4
144
10
10
Wire
UEW 0.3
UEW 0.2
UEW 0.2
UEW 0.2
UEW 0.2
Winding
method
FIT
SPACE
FIT
FIT
FIT
6
7
5
4
8
9
10
NS1
Dot Mark : Polarity
NP1
3
2
(Primary side) (Secondary side)
NP2
NS2
NS3
T D K
Lot No. 2 Month
1 Year
UNIT : mm
TOP VIEW
17.0 max.
20.0 max.
3.0 min.
(5.0 mm typ.)
22.5 max.
9-φ0.7
9-φ1.2
2
56
10
2
3
4
5
10
9
8
7
6
3.81 0.1
12.7 0.3
All products must be impregnated by var
nish.
Weight : (9)g