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| 型号： | LT1513IR#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/16页 |
| 文件大小： | 0K |
| 描述： | IC BATT CHRGR CONST/PROG I/V 7DD |
| 标准包装： | 50 |
| 功能： | 充电管理 |
| 电池化学： | 所有电池类型 |
| 电源电压： | 2.7 V ~ 25 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-263-8，D²Pak（7 引线+接片），TO-263CA |
| 供应商设备封装： | D2PAK-7 |
| 包装： | 管件 |
| 产品目录页面： | 1340 (CN2011-ZH PDF) |
LT1513/LT1513-2
APPLICATIO N S I N FOR M ATIO N
C 4 =
= 1 μ F
The suggested way to control unity loop frequency is to
increase the filter time constant on the I FB pin (R4/C4 in
Figures 1 and 7). The filter resistor cannot be arbitrarily
increased because high values will affect charging current
accuracy. Charging current will increase by 1% for each
40 ? increase in R4. There is no inherent limitation on the
value of C4, but if this capacitor is ceramic, it should be an
X7R type to maintain its value over temperature. X7R
dielectric requires a larger footprint.
The formula for calculating the minimum value for the filter
capacitor C4 is:
For example, assume V IN(MAX) = 15V, R3 = 0.4 ? (charging
current set to 0.25A), R4 = 24 ? , R5 = 330 ? and V BAT = 8V,
0 . 4 ( 4 )( 15 )( 12 )( 0 . 0015 )( 330 )
6.3(25000)(39)( 15 + 8 )
The value for C4 could be reduced to a more manageable size
by increasing R4 to 75 ? and reducing R5 to 300 ? , yielding
0.47 μ F for C4. The 2% increase in charging current can be
ignored or factored into the value for R3.
More Help
C 4 =
( R3 )( 4 )( V IN )( 12 )( 1500 μ )( R5 )
2 π ( f )( R 4 )( V IN + V BAT )
Linear Technology Field Application Engineers have a CAD
spreadsheet program for detailed calculations of circuit
V IN = Highest input voltage
1500 μ = Transconductance of error amplifier
(EA)f = Desired unity-gain frequency
V BAT = Battery voltage
operating conditions. In addition, our Applications Depart-
ment is always ready to lend a helping hand. The LT1371
data sheet may also be helpful. The LT1513 is identical
except for the current amplifier circuitry.
sn1513 1513fas
12
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相关代理商/技术参数 |
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| LT1513IT7 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Battery Management |
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| LT-1514-110-012 | 制造商:Carling Technologies 功能描述:SINGLE-POLE, LIGHTED TOGGLE, RED LENS - Bulk |
| LT-1514-110-024 | 制造商:Carling Technologies 功能描述:LT-SERIES TOGGLE SWITCH - Bulk |
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