- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383329 > MAX1620-MAX1621 (Maxim Integrated Products, Inc.) Digitally Adjustable LCD Bias Supplies PDF資料下載
參數(shù)資料
| 型號： | MAX1620-MAX1621 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Digitally Adjustable LCD Bias Supplies |
| 中文描述： | 數(shù)字式可調(diào)LCD偏置電源 |
| 文件頁數(shù)： | 15/20頁 |
| 文件大?。?/td> | 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
相關PDF資料 |
PDF描述 |
|---|---|
| MAX1620EEE | Digitally Adjustable LCD Bias Supplies |
| MAX1621EEE | Digitally Adjustable LCD Bias Supplies |
| MAX1623 | 3A, Low-Voltage, Step-Down Regulator with Synchronous Rectification and Internal Switches |
| MAX1623EAP | 3A, Low-Voltage, Step-Down Regulator with Synchronous Rectification and Internal Switches |
| MAX1624 | High-Speed Step-Down Controllers with Synchronous Rectification for CPU Power |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1621EEE | 功能描述:顯示驅(qū)動器和控制器 RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
| MAX1621EEE+ | 功能描述:其他電源管理 Digitally Adjustable LCD Bias Supply RoHS:否 制造商:Texas Instruments 輸出電壓范圍: 輸出電流:4 mA 輸入電壓范圍:3 V to 3.6 V 輸入電流: 功率耗散: 工作溫度范圍:- 40 C to + 110 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-48 封裝:Reel |
| MAX1621EEE+T | 功能描述:LCD 驅(qū)動器 Digitally Adjustable LCD Bias Supply RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| MAX1621EEE-T | 功能描述:顯示驅(qū)動器和控制器 RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
| MAX1621EPE+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
發(fā)布緊急采購，3分鐘左右您將得到回復。