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參數資料
| 型號： | MAX9550EUA |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | High-Current VCOM Drive Buffers for TFT LCDs |
| 中文描述： | 大電流的VCOM驅動緩沖器用于TFT液晶顯示器 |
| 文件頁數： | 6/12頁 |
| 文件大?。?/td> | 835K |
| 代理商： | MAX9550EUA |
M
High-Current VCOM Drive Buffers
for TFT LCDs
6
_______________________________________________________________________________________
MAX9550
16V
SUPPLY
16V
SUPPLY
*C1 = 4.7
μ
F
C
L
= 1
μ
F
*C2 = 0.1
μ
F
*PLACE 4.7
μ
F AND 0.1
μ
F CAPACITORS AS CLOSE TO PIN AS POSSIBLE.
**R
S
INCLUDES THE GENERATOR RESISTANCE.
NOTE:
PLACE C
L
AS CLOSE TO OUT PIN AS POSSIBLE AND KELVIN
SENSE THE FEEDBACK LOOP CONNECTION AS SHOWN.
0V TO 1.5V AT 50kHz
C
S
= 0.1
μ
F
**R
S
= 2.2
IN+
OUT
V
OUT
TEST LOAD
V
REF
V
DD
IN-
GND
Figure 1. Settling Time Test Circuit
Detailed Description
The MAX9550/MAX9551/MAX9552 operational transcon-
ductance amplifiers (OTA) hold the VCOM voltage sta-
ble while providing the ability to source and sink a high
current quickly (800mA typ) into a capacitive load such
as the backplane of a TFT-LCD panel. The output settles
to within 0.1% in less than 2μs. The fast settling time is
achieved by increasing the transconductance of the
buffer as the output current increases (see the
Typical
Operating Characteristics
).
In addition, the MAX9550/MAX9551/MAX9552 directly
drive the capacitive load in the VCOM layer of the
TFT LCD without the need for a series resistor.
The MAX9550/MAX9551/MAX9552 unity-gain band-
width is:
GBW = g
M
/ 2
π
C
OUT
where C
OUT
is the capacitive load at the output and g
M
is the transconductance.
To insure buffer stability, place a 1μF low-ESR capaci-
tor as close to the OUT pin as possible. However, this
value may be reduced if the TFT-LCD panel load pro-
vides some of the capacitance and the resistance in
series when this capacitance is low. Connect the feed-
back at OUT using a Kelvin connection at the low-ESR
capacitor.
Thermal Shutdown with Temperature
Hysteresis
The MAX9550/MAX9551/MAX9552 are capable of high
output currents and therefore, feature thermal-shutdown
protection with temperature hysteresis. When the die tem-
perature reaches +160°C, the devices shut down. When
the die cools down by 15°C, the devices turn on again.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX9550EUA+ | 功能描述:LCD 驅動器 RoHS:否 制造商:Maxim Integrated 數位數量:4.5 片段數量: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 |
| MAX9550EUA+T | 功能描述:LCD 驅動器 RoHS:否 制造商:Maxim Integrated 數位數量:4.5 片段數量: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 |
| MAX9550EUK+T | 制造商:Maxim Integrated Products 功能描述:- Tape and Reel |
| MAX9550EZK+ | 制造商:Maxim Integrated Products 功能描述:LCD DRVR 9V/12V/15V/18V 5PIN TSOT-23 - Rail/Tube |
| MAX9550EZK+T | 功能描述:LCD 驅動器 VCOM Drive Buffer for TFT LCD RoHS:否 制造商:Maxim Integrated 數位數量:4.5 片段數量: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 |
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