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参数资料
| 型号： | MAX1620-MAX1621 |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | Digitally Adjustable LCD Bias Supplies |
| 中文描述： | 数字式可调LCD偏置电源 |
| 文件页数： | 15/20页 |
| 文件大小： | 253K |
| 代理商： | MAX1620-MAX1621 |
M
Digitally Adjustable LCD Bias S upplies
______________________________________________________________________________________
15
START
CONDITION
MOST
SIGNIFICANT
ADDRESS BIT
LEAST
SIGNIFICANT
ADDRESS BIT
SLAVE PULLS
SDA LOW
MAX1621 DRIVES SDA
D4
POK
D3
D2
D1
D0
SLAVE
ACKNOWLEDGE
MOST
SIGNIFICANT
DATA BIT
SCL
SDA
R/W BIT
Figure 9. MAX1621 Serial-Interface Read Example
Design Procedure
__________and Component Selection
The MAX1620/MAX1621 output voltage can be adjusted
manually or via a digital interface. In addition, positive
bias voltage can be switched with
LCDON
using an
external PFET or PNP transistor.
Output Adjustment
Setting the Minimum Output Voltage
The minimum output voltage is set with a resistor-divider
(R4-R5, Figure 4) from V
OUT
to AGND. The FB threshold
voltage is 1.5V. Choose R4 to be 300k
so that the cur-
rent in the divider is about 5μA. Determine R5 as follows:
R5 = R4 x (V
OUT,MIN
- V
FB
) / V
FB
For example, if V
OUT,MIN
= 12.5V:
R5 = 300k
x (12.5 - 1.5) / (1.5) = 2.2M
Mount R4 and R5 close to the FB pin to minimize para-
sitic capacitance.
For a negative output voltage, the FB threshold voltage
is 0V, and R4 is placed between FB and REF (Figures 5
and 6). Again, choose R4 to be 300k
so that the cur-
rent in the divider is about 5μA. Then determine R5 as
follows:
R5 = R4 x
V
OUT,MIN
/ V
REF
For example, if V
OUT,MIN
= -12.5V:
R5 = 300k
x
(12.5) / (1.5)
= 2.5M
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1621EEE | 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 |
| MAX1621EEE+ | 功能描述:其他电源管理 Digitally Adjustable LCD Bias Supply RoHS:否 制造商:Texas Instruments 输出电压范围: 输出电流:4 mA 输入电压范围:3 V to 3.6 V 输入电流: 功率耗散: 工作温度范围:- 40 C to + 110 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-48 封装:Reel |
| MAX1621EEE+T | 功能描述:LCD 驱动器 Digitally Adjustable LCD Bias Supply RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| MAX1621EEE-T | 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 |
| MAX1621EPE+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
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