hd66731a01tb0l Renesas Electronics Corporation., hd66731a01tb0l Datasheet - Page 116

• Manufacturer Part Number: hd66731a01tb0l
• Description: Dot-matrix Liquid Crystal Display Controller/driver Supporting Japanese Kanji, Korean Font Display - Hitachi Semiconductor
• Manufacturer: Renesas Electronics Corporation.

Notes: 1.
Thermistor
Figure 47 Example of Power Supply for Liquid Crystal Display Drive (with Internal Booster)
V
2.
3.
4.
5.
6.
GND
CC
The reference voltage input (Vci) must be set below the power supply (V
Current that flows into reference voltage input (Vci) is 2-3 times larger than the load current
division.
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.
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.
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).
Make sure that you connect polarized capacitors correctly.
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
1
1
µ
µ
F +
F
+
GND
(Double boosting)
C1
C2
V5OUT2
V5OUT3
Vci
GND
V
V1
V2
V3
V4
V5
CC
R1
R1
R0
R1
R1
Thermistor
V
GND
CC
1
µ
F
1
1
µ
µ
F
+
F
+
+
GND
HD66730/HD66731
(Triple boosting)
Vci
GND
C1
C2
V5OUT2
V5OUT3
CC
).
V
V1
V2
V3
V4
V5
CC
R1
R1
R0
R1
R1
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