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參數(shù)資料
| 型號： | LT1513 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | SEPIC Constant- or Programmable-Current/ Constant-Voltage Battery Charger(初級線圈感應(yīng)轉(zhuǎn)換，恒定電流或可編程電流/恒定電壓電池充電器) |
| 中文描述： | SEPIC拓?fù)涞暮愣ɑ蚩删幊屉娏?恒定電壓電池充電器（初級線圈感應(yīng)轉(zhuǎn)換，恒定電流或可編程電流/恒定電壓電池充電器） |
| 文件頁數(shù)： | 14/16頁 |
| 文件大小： | 258K |
| 代理商： | LT1513 |
14
LT1513/LT1513-2
TYPICAL APPLICATIO
N
S
This Cold Cathode Fluorescent Lamp driver uses a Royer
class self-oscillating sine wave converter to driver a high
voltage lamp with an AC waveform. CCFL Royer converters
have significantly degraded efficiency if they must operate at
low input voltages, and this circuit was designed to handle
input voltages as low as 2.7V. Therefore, the LT1513 is
connected to generate a negative current through L2 that
allows the Royer to operate as if it were connected to a
constant higher voltage input.
The Royer output winding and the bulb are allowed to float in
this circuit. This can yield significantly higher efficiency in
situations where the stray bulb capacitance to surrounding
enclosure is high. To regulate bulb current in Figure 9, Royer
inputcurrent is sensed with R2 and filtered with R3 and C6.
This negative feedback signal is applied to the I
FB
pin of the
LT1513. For more information on this circuit contact the LTC
Applications Department and see Design Note 133. Consid-
erable written application literature on Royer CCFL circuits is
also available from other LTC Application and Design Notes.
2.7V
TO 20V
L1
20
μ
H
C2
4.7
μ
F
CERAMIC
C1
47
μ
F
ELECT
R4
20k
R3
10k
R5
330k
PWM DIMMING
(
≈
1kHz)
5
1
2
3
10
6
T1
4
C5
4.7nF
C9
1
μ
F
C10
10nF
D1
3A
R1
470
C3
0.082
μ
F
WIMA
C4
27pF
3kV
LAMP CURRENT
5.6mA
NEGATIVE VOLTAGE
IS GENERATED HERE
R2
0.25
1513 F09
R7
2k
D2
15V
3
2
4, TAB
7
6
1
5
L2
20
μ
H
CCFL
C6
0.1
μ
F
+
Q2
Q1
C2: TOKIN MULTILAYER CERAMIC
C3: MUST BE A LOW LOSS CAPACITOR, WIMA MKP-20 OR EQUIVALENT
L1, L2: COILTRONICS CTX20-4 (MUST BE SEPARATE INDUCTORS)
Q1, Q2: ZETEX ZTX849 OR FZT849
T1: COILTRONICS CTX110605 (67:1)
LT1513-2
V
FB
V
IN
V
SW
I
FB
GND
S/S
V
C
Figure 9. CCFL Power Supply for Floaing Lamp Configuration Operates on 2.7V
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT-1513-110-012 | 制造商:Carling Technologies 功能描述:LT-SERIES TOGGLE SWITCH - Bulk |
| LT-1513-110-125 | 制造商:Carling Technologies 功能描述:LT-SERIES TOGGLE SWITCH - Bulk |
| LT-1513-151-012 | 制造商:Carling Technologies 功能描述:LT-SERIES TOGGLE SWITCH - Bulk |
| LT1513-2 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:SEPIC Constant- or Programmable-Current/ Constant-Voltage Battery Charger |
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