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參數(shù)資料
| 型號： | MAX1739 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Wide Brightness Range CCFL Backlight Controllers |
| 中文描述： | 寬亮度范圍CCFL背光控制器 |
| 文件頁數(shù)： | 18/26頁 |
| 文件大?。?/td> | 444K |
| 代理商： | MAX1739 |
M
Wide Brightness Range
CCFL Backlight Controllers
18
______________________________________________________________________________________
a proven application that is useful for a wide range of
CCFL tubes and power ranges. Table 5 shows the rec-
ommended components for a 4.5W application.
MOSFETs
The MAX1739/MAX1839 require three external switches
to operate: N1, N2A, and N2B. N1 is the buck switch;
select a logic-level N-channel MOSFET with low R
DSON
to minimize conduction losses (100m
, 30V typ). Also
select a comparable-power Schottky diode for D1.
N2A/N2B are the Royer oscillator switches that drive
the transformer primary; select a dual-logic-level N-
channel MOSFET with low R
DSON
to minimize conduc-
tion losses (100m
, 30V typ).
Sense Resistors
R4 and R5 sense the transformer
’
s primary voltage.
Figure 9 shows the relationship between the primary
and secondary voltage. To set the maximum average
secondary transformer voltage, set R5 = 10k
, and
select R5 according to the following formula:
where V
S
is the maximum RMS secondary transformer
voltage (above the strike voltage), and N is the turns
ratio of the transformer.
R
R
V
N
S RMS
(
4
5
1 5
.
1
=
)
SPECIFICATION
SYMBOL
UNITS
DESCRIPTION
CCFL Minimum Strike
Voltage
(Kick-Off Voltage)
V
S
V
RMS
Although CCFLs typically operate at <550VRMS, a higher voltage
(1000V
RMS
and up) is required initially to start the tube. The strike
voltage is typically higher at cold temperatures and at the tube
’
s end
of life. This voltage is set by the combination of the maximum primary
voltage (center-tap voltage limit corresponding to
V
CTFB
= 0.6V) and the transformer (T1) turns ratio.
CCFL Typical Operating
Voltage
(Lamp Voltage)
VL
V
RMS
Once a CCFL has been struck, the voltage required to maintain light
output falls to approximately 550V
RMS
. Short tubes may operate on as
little as 250V
RMS
. The CCFL operating voltage stays relatively
constant, even as the tube
’
s brightness is varied.
CCFL Maximum Operating
Current (Lamp Current)
IL
mA
RMS
The maximum RMS AC current through a CCFL is typically 5mA
RMS
.
DC current is not allowed through CCFLs. The maximum lamp current
is set by the sense resistor (R13) at the maximum brightness setting.
CCFL Maximum Frequency
(Lamp Frequency)
fL
kHz
The maximum AC-lamp-current frequency. The MAX1739/ MAX1839
synchronize to the Royer oscillator frequency set by the external
components and are designed to operate between 32kHz and
100kHz.
DESIGNATION
L1
N1
N2
T1
D1
D2
D3
C6
C7
DESCRIPTION
RECOMMENDED DEVICE
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5371-T001 (CIUH842 style)
CRS02
BAT54
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GHM1038-SL-220J-3K
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MANUFACTURER
Sumida
Fairchild
Fairchild
Sumida
Toshiba
Fairchild
Fairchild
Murata
WIMA
47μH, 1.1A inductor
30V, 0.1
N-channel MOSFET
30V, 95m
dual N-channel MOSFET
8.7μH, 180:1 transformer
30V, 1A Schottky diode
0.1A Schottky diode
0.1A dual Schottky diode
22pF, 3.1kV capacitor
0.1μF, 63V, low-dissipation capacitor
Table 4. CCFL Specifications
Table 5. Components for the Standard Application Circuit
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| MAX1739-MAX1839 | Wide Brightness Range CCFL Backlight Controllers |
| MAX1739EEP | Wide Brightness Range CCFL Backlight Controllers |
| MAX1839 | Wide Brightness Range CCFL Backlight Controllers |
| MAX1839EEP | Wide Brightness Range CCFL Backlight Controllers |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1739EEP | 功能描述:顯示驅(qū)動器和控制器 RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
| MAX1739EEP+ | 功能描述:顯示驅(qū)動器和控制器 CCFL Backlight Controller RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
| MAX1739EEP+T | 功能描述:顯示驅(qū)動器和控制器 CCFL Backlight Controller RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
| MAX1739EEP-T | 功能描述:顯示驅(qū)動器和控制器 RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
| MAX1739EVKIT | 功能描述:電源管理IC開發(fā)工具 MAX1739 Eval Kit RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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