参数资料
| 型号： | MAX8759ETI+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 15/32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
PWMO
BUFFER
PWMI
A
D
MUX
"1"
PWM_MD
BUFFER
DIGITAL
MULTIPLIER
MUX
DPWM
SETTING
ALS
DIGITAL
POT
A
D
OFFSET
ALS
CLAMP
MUX
PWM_SEL
ALS_CTL
FAULT/
ALS
ALS
ALS
BRIGHT
DEVICE
STATUS
REGISTER
0X02
STATUS
REGISTER
0X04
LOW-LIMIT
REGISTER
0X05
HIGH-LIMIT
REGISTER
0X06
CONTROL
REGISTER
0X00
CONTROL
REGISTER
0X01
INVERTER
ON/OFF
SDA
SCL
SMBus
INTERFACE
SMBus AND AMBIENT-LIGHT-SENSOR INPUT BLOCK
Figure 3. MAX8759 SMBus and Ambient-Light-Sensor Input Block
A simplified CCFL inverter circuit is shown in Figure 5
(a). The full-bridge power stage is simplified and repre-
sented as a square-wave AC source. The resonant tank
circuit can be further simplified to Figure 5(b) by
removing the transformer. C S is the primary series
capacitor, C S ’ is the series capacitance reflected to the
secondary, C P is the secondary parallel capacitor, N is
the transformer turns ratio, L is the transformer sec-
ondary leakage inductance, and R L is an idealized
resistance that models the CCFL in normal operation.
Figure 6 shows the frequency response of the resonant
tank’s voltage gain under different load conditions. The
primary series capacitor is 1μF, the secondary parallel
capacitor is 15pF, the transformer turns ratio is 1:93,
and the secondary leakage inductance is 260mH.
Notice that there are two peaks, f S, and f P , in the fre-
quency response. The first peak f S is the series reso-
nant peak determined by the secondary leakage
inductance (L) and the series capacitor reflected to the
secondary (C’ S ):
f S =
1
2 π LC S ′
______________________________________________________________________________________
15
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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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