参数资料
| 型号： | MAX754ESE+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 6/16页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR CONTRAST 16-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 显示器类型： | CCFL - 冷色阴极荧光灯 |
| 电流 - 电源： | 500µA |
| 电源电压： | 4 V ~ 30 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SOIC |
| 包装： | 带卷 (TR) |
CCFL Backlight and
LCD Contrast Controllers
In Figure 1, the MAX758A, L1, and D5 form a voltage-
controlled switch-mode current source. The current out
1250
1221
1191
811
782
753
402
372
343
of L1 is proportional to the voltage applied to the SS
pin. The MAX758A contains a current-mode pulse-
width-modulating buck regulator that switches at
170kHz. The voltage on the SS pin sets the switch cur-
rent limit and thus sets the current out of L1.
CCFL Current-Regulation Loop
Figure 3 shows a block diagram of the regulation loop,
which maintains a fixed CCFL average lamp current
despite changes in input voltage and lamp impedance.
This loop regulates the average value of the half-wave
rectified lamp current. The root mean square lamp cur-
rent is related to, but not equal to, the average lamp
current. Assuming a sinusoidal lamp current, select R8
0 1 2 3
14 15 16
29 30 31
as follows:
R 8 =
π V REF
DAC CODE
2 I LAMP , RMS
where V REF = 1.25V and I LAMP,RMS is the desired full-
ZERO SCALE
MID SCALE
FULL SCALE
scale root mean square lamp current.
Figure 2. CCFT DAC Transfer Function
CON
CADJ
MAX754
LOGIC AND
5-BIT COUNTER
MAX758A
FULL-SCALE = 1.250V
HALF-SCALE = 0.782V
ZERO-SCALE = 0.343V
5-BIT VOLTAGE
SS
SWITCH-MODE
VOLTAGE CONTROLLED
CURRENT SOURCE
OUTPUT DAC
I BUCK
ERROR
AMPLIFIER
CC
CENTER-TAP
ROYER
OSCILLATOR
C10
CFB
TRANSISTOR
EMITTERS
C5
R18
R8
Figure 3. CCFL Tube Current-Regulation Loop
6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX755C/D | 功能描述:直流/直流开关转换器 Adjustable Negative-Output Inverting Current-Mode PWM Reg RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX755CPA | 功能描述:直流/直流开关调节器 5V- Inverting DC/DC Converter RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX755CSA | 功能描述:直流/直流开关调节器 5V- Inverting DC/DC Converter RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX755CSA+ | 功能描述:直流/直流开关调节器 5V- Inverting DC/DC Converter RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX755CSA+ | 制造商:Maxim Integrated Products 功能描述:IC INVERTING PWM REGULATOR 8-SOIC 制造商:Maxim Integrated Products 功能描述:IC, INVERTING PWM REGULATOR, 8-SOIC |
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