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參數(shù)資料
| 型號： | HCD66717A13BP |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | TRANSISTOR,BJT,NPN,700V V(BR)CEO,8A I(C),TO-247VAR |
| 中文描述： | （低功耗點陣液晶顯示控制器/驅(qū)動器） |
| 文件頁數(shù)： | 56/90頁 |
| 文件大?。?/td> | 716K |
| 代理商： | HCD66717A13BP |
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HD66717
508
When an Internal Booster and External Bleeder-Resistors are Used
When the internal operational amplifiers cannot fully drive the LCD panel used, V1 to V5 voltages can
be supplied through external bleeder-resistors (Figure 34). Here, the OPOFF pin must be set to the V
CC
level to turn off the internal operational amplifiers. Since the internal contrast adjuster is disabled in this
case, contrast must be adjusted externally. Double- and triple-boosters can be used as they are.
C1
C2
Vci
V5OUT2
V5OUT3
+
GND
+
V
CC
V1OUT
V2OUT
V3OUT
V4OUT
V5OUT
V
CC
Note: 1. Resistance of each external bleeder resistor should be 5 k
to 15 k
.
2. The bias current value for driving liquid-crystals can be varied by adjusting
the resistance (2R) between the V2OUT and V3OUT pins.
3. The internal contrast-adjuster is disabled; contrast must be adjusted either
by controlling the external variable resistor between V
EE
and V5OUT or Vci for the booster.
4. Vci is both a reference voltage and power supply for the booster; connect it to V
CC
directly
or combine it with a transistor so that sufficient current can be obtained.
5. Vci must be smaller than V
CC
.
–
+
–
+
–
+
–
+
–
+
V
EE
Booster
GND
+
0.47
μ
F
to 1
μ
F
0.47
μ
F
to 1
μ
F
0.47
μ
F
to 1
μ
F
HD66717
OPOFF =
V
CC
R
R
R
R
VR
2R
V
CC
V1
V2
V3
V4
V5
Figure 34 External Bleeder-Resistor Example for LCD Drive Voltage Generation Power Supply
Circuit
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