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| 型号： | LT1786FCS#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 18/20页 |
| 文件大小： | 0K |
| 描述： | IC SW REG CCFL SMBUS PROG 16SOIC |
| 标准包装： | 2,500 |
| 应用： | 转换器，CCFL |
| 输入电压： | 4.5 V ~ 30 V |
| 输出数： | 1 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SOIC |
| 包装： | 带卷 (TR) |
LT1786F
TYPICAL APPLICATIO N
Dual Transformer CCFL Power Supply
Space constraints may dictate utilization of two small
transformers instead of a single, larger unit. Although this
approach is somewhat more expensive, it can solve space
problems and offers other attractive advantages. Figure
2’s approach is essentially a “grounded lamp” LT1786F-
based circuit. The transistors drive two transformer pri-
maries in parallel. The transformer secondaries, stacked
in series, provide the output. The relatively small trans-
formers, each supplying half the load power, may be
located directly at the lamp terminals. Aside from the
obvious space advantage (particularly height), this
nating high voltage lead length. Additionally, although the
lamp receives differential drive, with its attendant low
parasitic losses, the feedback signal is ground referred.
Thus, the stacked secondaries afford floating lamp oper-
ating efficiency with grounded mode current certainty and
line regulation.
L1 is directly driven, with winding 4-5 furnishing feedback
in the normal fashion. L3, “slaved” to L1’s and L3’s
interconnects must be laid out for low inductance to
maintain waveform purity. The traces should be as wide as
possible (e.g., 1/8") and overlaid to cancel inductive
effects.
arrangement minimizes parasitic wiring losses by elimi-
27pF
LAMP
10
6
L1
6
10
L3
1000pF
220k
3
2
+
2.2 μ F
1
4
5
WIDE TRACE
SEE TEXT AND NOTES
3
0.1 μ F*
+
2
1
2.2 μ F
4
NC
5
NC
WIDE TRACE
0.1 μ F*
100k
BAT54
Q1-Q2
ZDT1048
L2
750 ?
MBRS130L
+V BAT
1
2
3
PGND
I CCFL
DIO
V SW
BULB
BAT
16
15
14
SHUTDOWN
1 μ F
4
5
6
V C
AGND
SHDN
LT1786F
ROYER
V IN
I OUT
13
12
11
+
2.2 μ F
16V
V IN
5V
7
8
SMBSUS
ADR
SCL
SDA
10
9
TO
SMBus
L1, L3 = COILTRONICS CTX110605
OVERLAY INDICATED TRACES BETWEEN L1 AND L3
L2 = COILTRONICS CTX100-4
HOST
* = WIMA MKI OR MKP-20
= PANASONIC ECH-U
18
COILTRONICS (561) 241-7876
Figure 2. Dual Transformers Save Space and Minimize parasitic Losses While Maintaining
Current Accuracy and Line Regulation. Trade-Off Is Increased Cost
1786 F02
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