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參數資料
| 型號： | ADM8840 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Charge Pump Regulator & COM Driver for Color TFT Panel |
| 中文描述： | 電荷泵穩壓器 |
| 文件頁數： | 9/10頁 |
| 文件大?。?/td> | 166K |
| 代理商： | ADM8840 |
ADM8840
–
9
–
REV. PrG
2/03
PRELIMINARY TECHNICAL DATA
BOOSTING THE CURRENT DRIVE OF THE +/-15V
SUPPLY
The ADM8840 +/-15V output can deliver 100uA of
current in the
typical
configuration, as shown in Figure
5.
In this configuration the 5Vout (pin 4) is connected to
5Vin (pin 5), as can be seen on block diagram Page 1 of
this data sheet.
SERIAL
INTERFACE
VREF
DAC 1
DAC 2
8
8
CLK
DATA
CS /
LDAC
LEVEL
TRANSLATOR
POWER
BUFFER
+
-
-
+
COM_IN
4.7 F
4.7 F
C
PANEL
22nF
5k
4.7 F
OSCILLATOR
CONTROL
LOGIC
GETIMING
CONTROL
DISCHARGE
VOLTAGE
DOUBLER
C1+
C1-
SHDN
VCC
LDO
VOLTAGE
REGULATOR
5VOUT
2.2 F
C7
DOUBLE
TRIPLE
VOLTAGE
TRIPLER
VOLTAGE
INVERTER
C2+
C2-
C3+
C3-
VOUT
VOLTAGE
ADDER
C5+
C5-
+15V
C4+
C4-
-15V
ADM8840
0.22 F
3.3 F
3.3 F
3.3 F
0.22 F
0.22 F
0.22 F
0.22 F
DAC1_SD
DAC1_IN
IDAC 1
INT/EXT
DAC 2
DAC2_SD
DAC2_IN
C4
C2
C3
C9
C8
ADD_OUT
TRANS_OUT
COM_OUT_AC
COM_OUT
GND
C5
C10
C11
C12
C13
4.7 F
C6
C1
5VIN
+5V
CurrentBoost
Configuration
Connection
Figure 5. Typical Configuration
It is possible to configure the ADM8840 to supply up to
400uA on the +/-15V outputs, by changing its
configuration slightly, as shown in Figure 6.
SERIAL
INTERFACE
VREF
DAC 1
DAC 2
8
8
CLK
DATA
CS /
LDAC
LEVEL
TRANSLATOR
POWER
BUFFER
+
-
-
+
COM_IN
4.7 F
4.7 F
C
PANEL
22nF
5k
4.7 F
OSCILLATOR
CONTROL
LOGIC
GETIMING
CONTROL
DISCHARGE
VOLTAGE
C1+
C1-
SHDN
VCC
VOLDO
REGULATOR
5VOUT
2.2 F
C7
DOUBLE
TRIPLE
TRIPLER
VOLTAGE
C2+
C2-
C3+
C3-
VOUT
VOLTAGE
ADDER
C5+
C5-
+15V
C4+
C4-
-15V
ADM8840
0.22 F
3.3 F
3.3 F
3.3 F
0.22 F
0.22 F
0.22 F
0.22 F
DAC1_SD
DAC1_IN
INT/EXT
DAC 1
INT/EXT
DAC 2
DAC2_SD
DAC2_IN
C4
C2
C3
C9
C8
ADD_OUT
TRANS_OUT
COM_OUT_AC
COM_OUT
GND
C5
C10
C11
C12
C13
4.7 F
C6
C1
5VIN
+5V
Figure 6. Current Boost Configuration
The configuration in Figure 6, can supply up to 400uA of
current on both the +15V and the -15V outputs. If the
load on the +/-15V does not draw any current the voltage
on the +/-15V outputs can rise up to +/-16.5V.In this
configuration Vout (pin 3) is connected to 5Vin (pin 5).
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