參數(shù)資料
型號(hào)： MAX8729
廠商： Maxim Integrated Products, Inc.
英文描述： Constant-Frequency, Half-Bridge CCFL Inverter Controller
中文描述： 固定頻率、半橋CCFL逆變控制器
文件頁(yè)數(shù)： 11/26頁(yè)
文件大?。?/td> 395K
代理商： MAX8729
M
Constant-Frequency, Half-Bridge CCFL
Inverter Controller
______________________________________________________________________________________
11
Pin Description (continued)
PIN
NAME
FUNCTION
18
IFB
Lamp-Current Feedback Input. The IFB sense signal is internally full-wave rectified. The average
value of the rectified signal is regulated to 790mV (typ) by controlling the on-time of the high-side
MOSFET. An open-lamp fault is generated if the IFB is continuously below 790mV (typ) for a period
set by TFLT. See the
Lamp-Out Protection
and
Setting the Fault-Delay Time
sections for details.
Transformer Secondary-Voltage Feedback Input. When the peak voltage on VFB exceeds the 2.3V
(typ) overvoltage threshold, the controller turns on an internal 1.2mA current sink, discharging the
COMP capacitor. A capacitive voltage-divider between the high-voltage terminal of the CCFL tube
and GND determines the maximum lamp output voltage during startup and lamp-out fault. See the
Setting the Secondary Voltage Limit
section for details.
Transformer Secondary-Current Feedback Input. When the peak voltage on ISEC exceeds the
internal overcurrent threshold, the controller turns on an internal 1.2mA current sink, discharging the
COMP capacitor. A current-sense resistor connected between the low-voltage end of the transformer
secondary and the ground determines the maximum secondary current during short-circuit fault. See
the
Setting the Secondary Current Limit
section for details.
DPWM Sync Input. DPWM frequency can be synchronized with an external signal on LSYNC. When
SEL is connected to V
CC
, the duty cycle of the LSYNC signal determines the brightness. LSYNC has
a Schmitt trigger input.
19
VFB
20
ISEC
21
LSYNC
22
PS1
Phase-Shift-Select Input. The PS1 and PS2 logic inputs select between four programmable phase
shifts (60°, 90°, 120°, and 180°) in master-slave operation. PS1 and PS2 should be in identical states
in each slave. See the
Phase Shift
section for details.
23
LX
Switching Node. LX is the return of the high-side gate driver. LX is also the input to the primary
current-limit and zero-crossing comparators. The controller senses the voltage across the high-side
MOSFET (IN - LX) and low-side MOSFET (LX - GND) to detect primary overcurrent condition and zero
crossing.
High-Side MOSFET Gate-Driver Output
High-Side Gate-Driver Supply Input. The MAX8729 includes an integrated boost diode. Connect a
0.1μF capacitor between LX and BST to complete the bootstrap circuit.
Power Ground. PGND is the return for the low-side gate driver.
Low-Side MOSFET Gate-Driver Output
Low-Side MOSFET Gate-Driver Supply Input
24
GH
25
BST
26
27
28
PGND
GL
V
DD
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX8729EEI 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
MAX8729EEI+ 功能描述:顯示驅(qū)動(dòng)器和控制器 Const-f Half-Bridge CCFL Inverter Ctlr 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
MAX8729EEI+T 功能描述:顯示驅(qū)動(dòng)器和控制器 Const-f Half-Bridge CCFL Inverter Ctlr 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
MAX8729EEI-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
MAX8729EVKIT 功能描述:電源管理IC開發(fā)工具 MAX8729 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
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