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| HD66730 Datasheet, PDF (116/131 Pages) Hitachi Semiconductor – Dot-Matrix Liquid Crystal Display Controller/Driver Supporting Japanese Kanji, Korean Font Display | |||
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HD66730/HD66731
(Double boosting)
VCC
(Triple boosting)
VCC
Thermistor
Vci
VCC
R1 Thermistor
Vci
VCC
R1
V1
V1
GND
R1
GND
R1
GND
V2
GND
V2
1 µF +
C1
C2
V3
R0
R1
1 µF +
C1
C2
R0
V3
R1
V4
V4
V5OUT2
R1
V5OUT2
R1
V5OUT3 V5
1 µF +
V5OUT3 V5
1 µF +
GND
1 µF +
GND
Notes: 1. The reference voltage input (Vci) must be set below the power supply (VCC).
2. Current that flows into reference voltage input (Vci) is 2-3 times larger than the load current
flowing through bleeder resistors. Note that a reference voltage drop occurs due to the
current flowing into the Vci input when a reference voltage (Vci) is generated by resistor
division.
3. The amount of output voltage (V5OUT2/V5OUT3) drop of a booster circuit also increases
as the load current flowing through bleeder resistors increases. Thus, set the bleeder
resistance as large as possible (4.7 k⦠or greater) without affecting display picture quality.
4. Adjust the reference voltage input (Vci) according to the fluctuation of booster characteristics
because the output voltage (V5OUT2/V5OUT3) drop depends on the load current,
operation temperature, operation frequency, capacitance of external capacitors,
and manufacturing tolerance. Refer to Electrical Characteristics for details.
5. Adjust the reference voltage input (Vci) so that the output voltage (V5OUT2/V5OUT3)
after boosting will not exceed the absolute maximum rating of liquid crystal power supply
voltage (15V).
6. Make sure that you connect polarized capacitors correctly.
Figure 47 Example of Power Supply for Liquid Crystal Display Drive (with Internal Booster)
115
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