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参数资料
| 型号： | LTC4012IUF-3#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | BATTERY CHARGE CONTROLLER, 633 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封装： | 4 X 4 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-220WGGD-1, QFN-20 |
| 文件页数： | 10/28页 |
| 文件大小： | 369K |
| 代理商： | LTC4012IUF-3#PBF |
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LTC4012-3
applicaTions inForMaTion
Programming Input Current Limit
To set the input current limit, ILIM, the minimum wall
adapter current rating must be known. To account for the
tolerance of the LTC4012-3 input current sense circuit, 5%
should be subtracted from the adapter’s minimum rated
output. Refer to Figure 6 and program the input current
limit function with the following equation:
R
mV
I
CL
LIM
=
100
where ILIM is the desired maximum current draw from
theDC(adapter)input,includingadjustmentsfortolerance,
if any.
Figure 6. Programming Input Current Limit
2
1
RCL
CDC
CF 0.1F
CLP
LTC4012-3
CLN
RF
5.1k
4012-3 F06
10k
FROM DC
POWER
INPUT
TO
REMAINDER
OF SYSTEM
3 INFET
2
1
CLP
CLN
17
INTVDD
LTC4012-3
RCL
1%
R3 = R1
1%
R1
1%
Q2
2SC2412
RF
2.49k 1%
R2
Q1
IMX1
4012-3 F07
CF
0.22F
TO REMAINDER
OF SYSTEM
FROM INFET
Figure 7. Adjusting Input Current Limit
Table 3. Common RCL Values
ADAPTER
RATING
(A)
RCL VALUE (1%)
(Ω)
RCL POWER
DISSIPATION
(W)
RCL POWER
RATING
(W)
1.00
0.100
0.25
1.25
0.080
0.125
0.25
1.50
0.068
0.150
0.25
1.75
0.056
0.175
0.25
2.00
0.050
0.200
0.25
2.50
0.039
0.244
0.50
3.00
0.033
0.297
0.50
3.50
0.027
0.331
0.50
4.00
0.025
0.400
0.50
Figure 7 shows an optional circuit that can influence
the parameters of the input current limit in two ways.
The first option is to lower the power dissipation of RCL at
theexpenseofaccuracywithoutchangingtheinputcurrent
limit value. The second is to make the input current limit
value programmable.
Often an AC adapter will include a rated current output
margin of at least +10%. This can allow the adapter cur-
rent limit value to simply be programmed to the actual
minimum rated adapter output current. Table 3 shows
some common RCL current limit programming values.
A lowpass filter formed by RF (5.1k) and CF (0.1F) is
required to eliminate switching noise from the LTC4012-3
PWM and other system components. If input current limit-
ing is not desired, CLN should be shorted to CLP while
CLP remains connected to power.
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相关代理商/技术参数 |
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| LTC4012IUF-3-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Efficiency, Multi-Chemistry Battery Charger with PowerPath Control |
| LTC4020EUHF#PBF | 制造商:Linear Technology 功能描述:Battery Charger Lead-Acid/Li-FePO4/Li-Ion/Li-Pol 20000mA 55V 38-Pin QFN EP 制造商:Linear Technology 功能描述:IC BATT CHARGER 55V BB 38QFN 制造商:Linear Technology 功能描述:BATTERY CHARGER, 20A, QFN-38 制造商:Linear Technology 功能描述:BATTERY CHARGER, 20A, QFN-38, Input Voltage:55V, Battery Charge Voltage:55V, Charge Current Max:20A, Battery IC Case Style:QFN, No. of Pins:38, No. of Series Cells:12, Operating Temperature Min:-40C, Operating Temperature Max:125C , RoHS Compliant: Yes |
| LTC4020EUHF#TRPBF | 制造商:Linear Technology 功能描述:Battery Charger Lead-Acid/Li-FePO4/Li-Ion/Li-Pol 20000mA 55V 38-Pin QFN EP T/R 制造商:Linear Technology 功能描述:IC BATT CHARGER 55V BB 38QFN 制造商:Linear Technology 功能描述:BATTERY CHARGER, 20A, QFN-38, Input Voltage:55V, Battery Charge Voltage:55V, Charge Current Max:20A, Battery IC Case Style:QFN, No. of Pins:38, No. of Series Cells:12, Operating Temperature Min:-40C, Operating Temperature Max:125C , RoHS Compliant: Yes |
| LTC4020IUHF#PBF | 制造商:Linear Technology 功能描述:Battery Charger Lead-Acid/Li-FePO4/Li-Ion/Li-Pol 20000mA 55V 38-Pin QFN EP 制造商:Linear Technology 功能描述:IC BATT CHARGER 55V BB 38QFN 制造商:Linear Technology 功能描述:BATTERY CHARGER, 20A, QFN-38 制造商:Linear Technology 功能描述:BATTERY CHARGER, 20A, QFN-38, Input Voltage:55V, Battery Charge Voltage:55V, Charge Current Max:20A, Battery IC Case Style:QFN, No. of Pins:38, No. of Series Cells:12, Operating Temperature Min:-40C, Operating Temperature Max:125C , RoHS Compliant: Yes |
| LTC4020IUHF#TRPBF | 制造商:Linear Technology 功能描述:Battery Charger Lead-Acid/Li-FePO4/Li-Ion/Li-Pol 20000mA 55V 38-Pin QFN EP T/R 制造商:Linear Technology 功能描述:IC BATT CHARGER 55V BB 38QFN 制造商:Linear Technology 功能描述:BATTERY CHARGER, 20A, QFN-38, Input Voltage:55V, Battery Charge Voltage:55V, Charge Current Max:20A, Battery IC Case Style:QFN, No. of Pins:38, No. of Series Cells:12, Operating Temperature Min:-40C, Operating Temperature Max:125C , RoHS Compliant: Yes |
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