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參數(shù)資料
| 型號： | AN-995A |
| 英文描述： | Electronic Ballasts Using the Cost-Saving IR215X Drivers(153.99 k) |
| 中文描述： | 使用電子鎮(zhèn)流器的成本節(jié)約IR215X驅(qū)動器（153.99十一） |
| 文件頁數(shù)： | 7/10頁 |
| 文件大?。?/td> | 153K |
| 代理商： | AN-995A |
Application
Notes
C
ONTROL
I
NTEGRATED
C
IRCUIT
D
ESIGNERS’
M
ANUAL
C-65
ther start pulses are supplied. The hot re-strike time of
this ballast is approximately 75 seconds.
The circuits described above have illustrated some of
the ways in which the IR2151 Control IC may be used in
synchronized and non-synchronized ballasts.
Some applications require higher lamp voltages which
may be too high for the simple half-bridge topology. By
using four power MOSFETs in a full bridge circuit, the
output voltage may be doubled without increasing the
MOSFET current. A full bridge circuit automatically
doubles output power and this topology can be imple-
mented with the IR2151 low-cost master oscillator driv-
Figure 8.
Remote dimming control by variable resistor
AC
+15V
51K
51K
1N9141N914
20K
TO LAMP
CIRCUIT
POWER FACTOR > 0.95
DIMMING
50K
0.001
μ
F
1
μ
F
V
CC
R
T
C
T
V
B
HO
V
S
LO
COM
IR2151
Figure 7.
Local dimming by bus voltage control
FOR COMPONENT VALUES SEE FIGURE 6.
POWER FACTOR >0.95
40
W
40
W
L3
L2
0.001
μ
F
20K
4.7K
4.7K
IRF820
L1
L1
120
V
CC
V
B
V
S
HO
LO
COM
R
C
T
IR2151
ing an IR2111 slave circuit. Figure 12 illustrates this to-
pology which is described in the following text.
This ballast is intended to drive two 80W fluorescent
lamps such as F96-T12 type. These lamps are operated
at the same current as their 48 inch counterparts but re-
quire twice the voltage both for striking and normal op-
eration. These slim line lamps have single pin contacts
and are designed to be instantly started from suitable
ballasts. Since the lamps start with cold electrodes, the
ballast must provide in excess of 800V RMS for reliable
starting of any lamp at low ambient temperatures.
The circuit shows a full bridge with each leg driven
from a separate Control IC. U1 is a self-oscillating
driver (IR2151) and U2 is a slave driver (IR2111). The
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