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| 型號： | HE84G761(S) |
| 文件頁數(shù)： | 24/52頁 |
| 文件大小： | 631K |
| 代理商： | HE84G761(S) |
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9.
LCD Power Supply
KING BILLION ELECTRONICS CO., LTD
駿
億
電
子
股
份
有
限
公
司
HE84G761
HE80004 Series
June 30, 2003
This specification is subject to change without notice. Please contact sales person for the latest version before use.
24
V1.01
The built-in LCD power supply is equipped with input voltage regulator, voltage multiplier and bias
voltage generating circuit with active buffer instead of passive resistor voltage dividing network. The
input voltage is regulated to LVREG using the internally generated LVAG as reference voltage. LVREG
can be adjusted by resistor between LGS1 and LVREG.
LVREG adjustment guideline
: First, the level of VDD must be 0.3 volt higher than LVREG even at the
end of battery life for the regulator to function properly. For example, if the VDD is expected to drop to
2.2 volts when battery is low, then the level of LVREG can only be set at 1.9 volts max. Secondly, the
higher the level of LVREG, the less multiples it requires pumping LVP to same level. For example, to
pump the 2.25 volts to 9 volts requires 4 times multiplier; to pump the 3 volts to 9 volts requires only 3
time multiplier which consumes less power. So it is advisable not to adjust the LVREG to an unnecessary
low level.
Voltage multiplication:
The LVREG is then multiplied by 3, 4, or 5 times, depending on external
capacitors configurations as shown below, to generate LVP. Please note that LVP must be lower than 9
volts to prevent chip from breaking down.
LVL1
LVL1
LVL1
LVL2
LVL2
LVL2
LVL3
LVL3
LVL3
LVL4
LVL4
LVL4
LVL5
LVL5
LVL5
LGS2
LGS2
LGS2
LVP
LVP
LVP
LCAP4A
LCAP4A
LCAP4A
LCAP2B
LCAP2B
LCAP2B
LCAP2A
LCAP2A
LCAP2A
LCAP1A
LCAP1A
LCAP1A
LCAP1B
LCAP1B
LCAP1B
LCAP3A
LCAP3A
LCAP3A
LVREG
LVREG
LVREG
LGS1
LGS1
LGS1
LVAG
LVAG
LVAG
4.7uF
4.7uF
4.7uF
4.7uF
0.1uF
0.1uF
4.7uF
4.7uF
4.7uF
4.7uF
0.1uF
0.1uF
4.7uF
4.7uF
4.7uF
4.7uF
0.1uF
0.1uF
0.1uF
0.1uF
0.1uF
0.1uF
R
R
0.1uF
0.1uF
0.1uF
0.1uF
0.1uF
0.1uF
R
R
0.1uF
0.1uF
0.1uF
0.1uF
0.1uF
R
R
x4 multiplier
x5 multiplier
x3 multiplier
The LVP is then regulated to generated LVL1 ~ LVL5. LVL5 can be adjusted by the resistor between
LGS2 and LV5. Be sure to leave at least 0.3 volt between LVP and LV5 for the regulator circuit to
function properly. The formula is:
LVL5 = (1 + R2/80K) x 0.9V
Different duties require different bias settings. There is some theoretical correspondence between the
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