参数资料
| 型号： | MAX8759ETI+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 10/32页 |
| 文件大小： | 0K |
| 描述： | IC CNTRL CCFL BACKLIGHT 28TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | CCFL 控制器 |
| 频率： | 30 ~ 80 kHz |
| 电流 - 电源： | 2.5mA |
| 电源电压： | 4.5 V ~ 28 V |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
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Low-Cost, SMBus, 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
SDA
SCL
TFLT
VALS
ALS
PWMI
PWMO
FREQ
COMP
DEL
IFB1
IFB2
VFB
ISEC
LX1
GH1
FUNCTION
Supply Input. BATT is the input to the internal 5.35V linear regulator that powers the device. Bypass BATT
to GND with a 0.1μF ceramic capacitor.
SMBus Serial Data Input
SMBus Serial Clock Input
Fault-Timer Adjustment Pin. Connect a capacitor from TFLT to GND to set the time-out periods for open-
lamp and secondary overcurrent faults.
Ambient-Light-Sensor Supply Pin. Bypass VALS to GND with a 0.1μF capacitor.
Ambient-Light-Sensor Input
DPST Control Input
DPST Buffer Output. Connect a capacitor between PWMO and GND. The capacitor forms a lowpass filter
with an internal 40k ? (typ) resistor for filtering the DPST signal.
Chopping-Frequency Adjustment Pin. Connect a resistor from FREQ to GND to set the DPWM frequency:
f DPWM = 210Hz × 169k ? / R FREQ .
Transconductance Error Amplifier Output. A compensation capacitor connected between COMP and GND
sets the rise and fall time of the lamp-current envelope in DPWM operation.
Adaptive Zero-Crossing-Delay Adjustment Pin. Connect a resistor between DEL and GND to adjust the
range of the zero-crossing delay. Connecting DEL to V CC disables the zero-crossing delay function.
Lamp-Current-Feedback Input. The IFB1 sense signal is internally full-wave rectified. IFB1 is compared
with IFB2 and the larger is used for lamp-current regulation. The average value of the rectified signal is
regulated to 785mV (typ) by controlling the on-time of high-side switch. An open-lamp fault is generated if
the peak voltage of IFB1 is below 600mV for a fault delay period set by TFLT.
Lamp-Current-Feedback Input. The IFB2 sense signal is internally full-wave rectified. IFB1 is compared
with IFB2 and the larger is used for lamp-current regulation. The average value of the rectified signal is
regulated to 800mV (typ) by controlling the on-time of high-side switch. An open-lamp fault is generated if
the peak voltage of IFB2 is below 600mV for a fault-delay period set by TFLT. IFB2 input can be disabled
by connecting IFB2 to V CC .
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 striking and lamp-out
fault. When the peak voltage on VFB exceeds the internal overvoltage threshold, the controller turns on an
internal current sink, discharging the COMP capacitor to limit the switch on-time. The VFB pin is also used
to detect a secondary undervoltage condition. If the peak voltage on VFB is below 230mV continuously for
250μs during the DPWM ON period, the MAX8759 shuts down.
Transformer Secondary Current-Feedback Input. A current-sense resistor connected between the low-
voltage end of the transformer secondary and the ground sets the maximum secondary current during
short-circuit fault. When the peak voltage on ISEC exceeds the internal overcurrent threshold, the
controller turns on an internal current sink discharging the COMP capacitor.
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.
High-Side MOSFET NH1 Gate Driver Output
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8759EVKIT | 功能描述:显示开发工具 MAX8759 Eval Kit RoHS:否 制造商:4D Systems 产品:4Display Shields 工具用于评估:?OLED-160-G1, ?OLED-160-G2 接口类型:Serial 工作电源电压:5 V |
| MAX875ACPA | 制造商:Rochester Electronics LLC 功能描述: |
| MAX875ACPA+ | 功能描述:基准电压& 基准电流 2.5/5/10V Precision Voltage Reference RoHS:否 制造商:STMicroelectronics 产品:Voltage References 拓扑结构:Shunt References 参考类型:Programmable 输出电压:1.24 V to 18 V 初始准确度:0.25 % 平均温度系数（典型值）:100 PPM / C 串联 VREF - 输入电压（最大值）: 串联 VREF - 输入电压（最小值）: 分流电流（最大值）:60 mA 最大工作温度:+ 125 C 封装 / 箱体:SOT-23-3L 封装:Reel |
| MAX875ACSA | 制造商:Maxim Integrated Products 功能描述:- Bulk |
| MAX875ACSA+ | 功能描述:基准电压& 基准电流 2.5/5/10V Precision Voltage Reference RoHS:否 制造商:STMicroelectronics 产品:Voltage References 拓扑结构:Shunt References 参考类型:Programmable 输出电压:1.24 V to 18 V 初始准确度:0.25 % 平均温度系数（典型值）:100 PPM / C 串联 VREF - 输入电压（最大值）: 串联 VREF - 输入电压（最小值）: 分流电流（最大值）:60 mA 最大工作温度:+ 125 C 封装 / 箱体:SOT-23-3L 封装:Reel |
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