参数资料
| 型号： | MAX8722CEEG+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 9/21页 |
| 文件大小： | 0K |
| 描述： | IC CCFL BACKLIGHT CTRL 24-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 类型： | CCFL 控制器 |
| 频率： | 30 ~ 80 kHz |
| 电流 - 电源： | 1mA |
| 电流 - 输出： | 300mA |
| 电源电压： | 4.6 V ~ 28 V |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 24-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 24-QSOP |
| 包装： | 管件 |
Low-Cost CCFL Backlight Controller
Pin Description
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
NAME
BATT
SHDN
ILIM
TFLT
CNTL
DPWM
SYNC
FREQ
COMP
IFB
VFB
ISEC
GH2
LX2
BST2
BST1
LX1
FUNCTION
Supply Input. BATT is the input to the internal 5.4V linear regulator that powers the device. Bypass BATT
to GND with a 0.1 μF ceramic capacitor.
Shutdown Control Input. The device shuts down when SHDN is pulled to GND.
Primary Current-Limit Adjustment Input. Connect a resistive voltage-divider between V CC and GND to set
the primary current limit. The current-limit threshold is 1/5 of the voltage at ILIM. Connect it to V CC with a
pullup resistor to select the default current-limit threshold of 0.2V.
Fault Timer Adjustment Pin. Connect a capacitor from TFLT to GND to set the timeout periods for open-
lamp and secondary overcurrent faults.
Brightness Control Input. Varying V CNTL between 0 and 2V varies the DPWM duty cycle (brightness)
between 10% (minimum) and 100% (maximum). The brightness remains at maximum for V CNTL greater
than 2V.
Dual-Function DPWM Signal Pin. The DPWM pin can be used either as the DPWM signal output or as a
low-frequency sync input. See the DPWM Dimming Control and DPWM Frequency Setting sections.
DPWM High-Frequency Sync Input. The DPWM chopping frequency can be synchronized to an external
high-frequency signal by connecting FREQ to V CC and SYNC to the external signal source. The DPWM
chopping frequency is 1/128 of the frequency of the external signal.
DPWM Frequency Dual-Mode Adjustment Pin. Connect a resistor from FREQ to GND to set the DPWM
frequency. Connect FREQ to V CC to set DPWM frequency using SYNC.
f DPWM = 210Hz x 169k /R FREQ
Transconductance Error-Amplifier Output. A compensation capacitor connected between COMP and GND.
Lamp-Current Feedback Input. The average voltage on IFB is regulated to 0.78V by controlling the on-
time of high-side switches. If V IFB falls below 0.6V for a period longer than the timeout period set by
TFLT, the MAX8722C activates the fault latch.
Transformer Secondary Voltage Feedback Input. A capacitive voltage-divider between the high-voltage
terminal of the CCFL tube and GND sets the maximum average lamp voltage during lamp strike and
open-lamp conditions. When the average voltage on VFB exceeds the internal overvoltage threshold,
the controller turns on an internal current sink discharging the COMP capacitor. The VFB pin is also
used to detect a secondary undervoltage condition. If the peak voltage on VFB is below 430mV
continuously for 260 μs (typ) during the DPWM ON period, the MAX8722C shuts down. For the actual
timeout see the VFB Undervoltage Protection Timeout in the Electrical Characteristics table.
Transformer Secondary Current Feedback Input. A current-sense resistor connected between the low-
voltage end of the transformer secondary and ground sets the maximum secondary current during
faults. When the average voltage on ISEC exceeds the internal overcurrent threshold, the controller turns
on an internal current sink discharging the COMP capacitor.
High-Side MOSFET NH2 Gate-Driver Output
GH2 Gate-Driver Return. LX2 is the input to the current-limit and zero-crossing comparators. The device
senses the voltage across the low-side MOSFET NL2 to detect primary current zero-crossing and
primary overcurrent.
GH2 Gate-Driver Supply Input. Connect a 0.1μF capacitor from LX2 to BST2.
GH1 Gate-Driver Supply Input. Connect a 0.1μF capacitor from LX1 to BST1.
GH1 Gate-Driver Return. LX1 is the input to the current-limit and zero-crossing comparators. The device
senses the voltage across the low-side MOSFET NL1 to detect primary current zero-crossing and
primary overcurrent.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8722CEEG+ | 功能描述:显示驱动器和控制器 CCFL Backlight Controller RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
| MAX8722CEEG+T | 功能描述:显示驱动器和控制器 CCFL Backlight Controller RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
| MAX8722EEG | 功能描述:显示驱动器和控制器 RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
| MAX8722EEG+ | 功能描述:显示驱动器和控制器 CCFL Backlight Controller RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
| MAX8722EEG+T | 功能描述:显示驱动器和控制器 CCFL Backlight Controller RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
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