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HE84770C(S) PDF预览

HE84770C(S)

更新时间： 2022-01-18 18:38:00
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HE84770C(S) 数据手册

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King Billion Electronics Co., Ltd  
HE84770C  
駿 億 電 子 股 份 有 限 公 司  
HE80000 SERIES  
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.  
x3 multiplier  
x4 multiplier  
x5 multiplier  
4.7uF  
LVL1  
4.7uF  
LVL1  
4.7uF  
LVL1  
0.1uF  
LVL2  
0.1uF  
LVL2  
0.1uF  
LVL2  
0.1uF  
LVL3  
0.1uF  
LVL3  
0.1uF  
LVL3  
4.7uF  
LVL4  
4.7uF  
LVL4  
4.7uF  
LVL4  
10uF  
LVL5  
10uF  
LVL5  
10uF  
LVL5  
LGS2  
LGS2  
LGS2  
R
R
R
4.7uF  
LVP  
4.7uF  
LVP  
4.7uF  
0.1uF  
LVP  
LCAP4A  
LCAP2B  
LCAP2A  
LCAP1A  
LCAP1B  
LCAP3A  
LVREG  
LGS1  
LCAP4A  
LCAP2B  
LCAP2A  
LCAP1A  
LCAP1B  
LCAP3A  
LVREG  
LGS1  
LCAP4A  
LCAP2B  
LCAP2A  
LCAP1A  
LCAP1B  
LCAP3A  
LVREG  
LGS1  
0.1uF  
0.1uF  
0.1uF  
0.1uF  
0.1uF  
0.1uF  
0.1uF  
0.1uF  
0.1uF  
0.1uF  
0.1uF  
0.1uF  
R
R
R
LVAG  
0.1uF  
LVAG  
0.1uF  
LVAG  
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  
Duty and Bias Setting. However, it is better to use it as starting point and adjust it with real LCD panel  
connected to it to determine the final setting. The theoretic relationship between the duty and bias setting  
as following:  
Duty Cycle Normal Bias Alternative Bias  
32 duty  
48 duty  
64 duty  
80 duty  
1/7  
1/8  
1/7.5  
1/7.5, 1/8.5  
1/8.5, 1/9.5  
1/9.5, 1/10.5  
1/9  
1/10  
The bias setting is made by mask option MO_LBSR[2..0].  
MO_LBSR[2..0] Bias Setting  
August 25, 2003  
Page 9 of 25  
V1.1E  
This specification is subject to change without notice. Please contact sales person for the latest version before use.  
1...6789101112...25

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