參數(shù)資料
型號(hào)： MAX1739EEP
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 穩(wěn)壓器
英文描述： Wide Brightness Range CCFL Backlight Controllers
中文描述： FLUORESCENT LIGHT CONTROLLER, 64 kHz SWITCHING FREQ-MAX, PDSO20
封裝： 0.150 INCH, 0.025 INCH PITCH, QSOP-20
文件頁(yè)數(shù)： 17/26頁(yè)
文件大小： 444K
代理商： MAX1739EEP
M
Wide Brightness Range
CCFL Backlight Controllers
______________________________________________________________________________________
17
Figure 8. Standard Application Circuit
increases the circuit
’
s demand for current but may not
be enough to blow the fuse. With the buck switch short-
ed, the center tap rises above its regulation point,
which causes the CCV amplifier
’
s output (V
CCV
) to go
low. To detect this, the MAX1739/MAX1839 check that
V
CCV
is below 1V at the end of every DPWM period. If
this condition persists for over 250ms (or 64 DPWM
pulses), the inverter switch commutation is stopped
with either DL1 or DL2 on. With the buck switch short-
ed, this will cause a short circuit with enough current to
blow the fuse. If the buck switch is not shorted, then the
inverter latches off as in a lamp-out condition.
Both buck-switch short and lamp-out detection will
clear the STATUS1 bit in the SMBus interface. STA-
TUS1 does not clear immediately but will clear about 2
seconds after the inverter has been forced off (see
Digital Interface
).
Note that once the inverter board fuse has blown,
SMBus communications with the part will cease since
the MAX1739 will then be without power.
Applications Information
As shown in the standard application circuit (Figure 8),
the MAX1739/MAX1839 regulate the current of a 4.5W
CCFL. The IC
’
s analog voltage interface sets the lamp
brightness with a minimum 20:1 power adjustment
range. This circuit operates from a wide supply-voltage
range of 7V to 24V. Typical applications include note-
book, desktop monitor, and car navigation displays.
CCFL Specifications
To select the correct component values for the
MAX1739/MAX1839 circuit, several CCFL parameters
(Table 4) and the minimum DC input voltage must be
specified.
Royer Oscillator
Components T1, C6, C7, N2A, and N2B form the Royer
oscillator. A Royer oscillator is a resonant tank circuit
that oscillates at a frequency dependent on C7, the pri-
mary magnetizing inductance of T1 (LP), and the
impedance seen by the T1 secondary. Figure 8 shows
BATT
CCV
V
IN
(5V TO 28V)
C9
4.7
μ
F
C3
C4
C6
C7
N2B
R13
N2A
D5
T1
N1
D2
D1
R4
R5
C5
L1
C2
C1
VL
VL
DHI
BST
LX
SYNC
CTFB
DL2
DL1
GND
CS
CSAV
CCI
REF
MINDAC
CRF/SDA
DIMMING
ON/OFF
CTL/SCL
SH/SUS
MAX1739
MAX1839
MODE
相關(guān)PDF資料
PDF描述
MAX1839 Wide Brightness Range CCFL Backlight Controllers
MAX1839EEP Wide Brightness Range CCFL Backlight Controllers
MAX1740 Digital Signal Processors 144-LQFP
MAX1741 SIM/Smart Card Level Translators in レMAX
MAX1740EUB SIM/Smart Card Level Translators in レMAX
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(dòng)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(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel
MAX1739EEP+T 功能描述:顯示驅(qū)動(dòng)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(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel
MAX1739EEP-T 功能描述:顯示驅(qū)動(dòng)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(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel
MAX1739EVKIT 功能描述:電源管理IC開(kāi)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(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
MAX173BCNG 制造商:Maxim Integrated Products 功能描述:
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*