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參數(shù)資料
| 型號： | BUF01900AIDRCR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 模擬信號調理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO10 |
| 封裝： | 3 X 3 MM, 0.90 MM HEIGHT, GREEN, PLASTIC, SON-10 |
| 文件頁數(shù)： | 7/26頁 |
| 文件大小： | 662K |
| 代理商： | BUF01900AIDRCR |
BUF01900
BUF01901
SBOS337A OCTOBER 2006 REVISED OCTOBER 2006
www.ti.com
15
EXTERNAL VOLTAGE DIVIDER RESISTOR
SELECTION
The external resistive voltage-divider consisting of R1 and
R2 (see Figure 16, Figure 17, and Figure 18) sets both the
maximum value of the VCOM adjustment range and the ini-
tial VCOM voltage. Follow the steps below to calculate the
correct values for R1 and R2
Step 1: Choose the supply voltage, (VS)
Step 2: Set the nominal VCOM voltage. This voltage is the
VCOM voltage at which the unadjusted panel should be at
power-on. The default power-up DAC code is midscale.
Step 3: Choose the VCOM adjustment range. The adjust-
ment range is the difference between the lowest and the
highest desired VCOM voltage. If the default power-up code
is not overwritten by software at the beginning of the ad-
justment cycle, the adjustment range is symmetrical
around the chosen nominal VCOM voltage.
Step 4: Calculate the resistors based on the following for-
mulas or simply download the Microsoft Excel
calculator
located in the product folder of BUF0190x available at
www.ti.com.
R
1
+
250k
W
@ Adj_range
V
COM * 0.5
@ (Adj_range)
R
2
+
1
V
S
V
COM
1
R
1
) 1
500k
W *
1
R
1
* 1
250k
W
CALCULATING THE VCOM OUTPUT VOLTAGE
With R1 and R2 properly set, VBIAS or VCOM output voltage
can be calculated for any digital code with the following for-
mula:
V
COM +
250k
W
@ R
2 @ VS ) R 1 @ R2 @ VS (Code 1023)
R
1 @ R2 ) 250kW @ R1 ) R2
CALCULATING THE ADJUSTMENT
RESOLUTION
The resolution of the adjustment is a function of the step
size. The resolution can be calculated by simply dividing
the chosen adjustment range by the number of steps:
Resolution = Adj_range/steps (example: 32 steps be-
tween code 0h and code 3FFh)
DESIGN EXAMPLE
Step 1: Supply Voltage is 10V.
Step 2: Nominal VCOM is determined to be 4V.
Step 3: The desired total adjustment range is 1V. In the
case of using the default power-up DAC code (midscale),
the adjustment range for the VCOM voltage will be from
3.5V to 4.5V.
Step 4: Calculation of R1 and R2
R1 = 71.4k
=> choose closest 1% resistor (71.5k)
R2 = 45.5k
=> choose closest 1% resistor (45.3k)
Step 5: Appropriate number of adjustment steps between
code 00h and code 3FFh is determined to be 32. This value
leads to a step size of 32 codes between adjustment
points, which translates into approximately 31mV voltage
difference between steps.
MOTOR DRIVE CIRCUIT
The BUF01900 can be used to drive small motors directly
because of the large output drive capability (> 100mA), as
illustrated in Figure 23.
BUF01900
V
COM
M
15V
C
V
SD
10k
10k
Figure 23. Motor Drive Circuit
(1)
(2)
(3)
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| BUF01900AIDRCRG4 | 功能描述:LCD Gamma緩沖器 Ref Vltg Gen for VCOM Adj RoHS:否 制造商:Maxim Integrated 輸入補償電壓: 轉換速度: 電源電壓-最大:20 V 電源電壓-最小:9 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:TQFN-38 封裝:Tube |
| BUF01900AIDRCT | 功能描述:LCD Gamma緩沖器 Ref Vltg Gen for VCOM Adj RoHS:否 制造商:Maxim Integrated 輸入補償電壓: 轉換速度: 電源電壓-最大:20 V 電源電壓-最小:9 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:TQFN-38 封裝:Tube |
| BUF01900AIDRCTG4 | 功能描述:LCD Gamma緩沖器 Ref Vltg Gen for VCOM Adj RoHS:否 制造商:Maxim Integrated 輸入補償電壓: 轉換速度: 電源電壓-最大:20 V 電源電壓-最小:9 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:TQFN-38 封裝:Tube |
| BUF01900AIPW | 功能描述:LCD Gamma緩沖器 Ref Vltg Gen for VCOM Adj RoHS:否 制造商:Maxim Integrated 輸入補償電壓: 轉換速度: 電源電壓-最大:20 V 電源電壓-最小:9 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:TQFN-38 封裝:Tube |
| BUF01900AIPWG4 | 功能描述:LCD Gamma緩沖器 Ref Vltg Gen for VCOM Adj RoHS:否 制造商:Maxim Integrated 輸入補償電壓: 轉換速度: 電源電壓-最大:20 V 電源電壓-最小:9 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:TQFN-38 封裝:Tube |
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