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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： | 8/28页 |
| 文件大小： | 369K |
| 代理商： | LTC4012IUF-3#PBF |
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LTC4012-3
applicaTions inForMaTion
Programming Charge Current
The formula for charge current is:
I
R
V
R
A
CHRG
IN
SENSE
PROG
=
.
– .
1 2085
11 67
The LTC4012-3 operates best with 3.01k input resistors,
although other resistors near this value can be used to
accommodate standard sense resistor values. Refer to
the subsequent discussion on inductor selection for other
considerations that come into play when selecting input
resistors RIN.
RSENSE should be chosen according to the following
equation:
R
mV
I
SENSE
MAX
=
100
where IMAX is the desired maximum charge current ICHRG.
The100mVtargetcanbeadjustedtosomedegreetoobtain
standard RSENSE values and/or a desired RPROG value, but
targetvoltageslowerthan100mVwillcauseaproportional
reduction in current regulation accuracy.
TherequiredminimumresistancebetweenPROGandGND
can be determined by applying the suggested expression
for RSENSE while solving the first equation given above for
charge current with ICHRG = IMAX:
R
V R
V
A R
PROG MIN
IN
(
)
.
.
=
+
1 2085
0 1
11 67
If RIN is chosen to be 3.01k with a sense voltage of 100mV,
this equation indicates a minimum value for RPROG of
26.9k. Table 6 gives some examples of recommended
charge current programming component values based
on these equations.
The resistance between PROG and GND can simply be
set with a single a resistor, if only maximum charge cur-
rent needs to be controlled during the desired charging
algorithm.
However, some batteries require a low charge current for
initial conditioning when they are heavily discharged. The
charge current can then be safely switched to a higher
level after conditioning is complete. Figure 3 illustrates
one method of doing this with 2-level control of the PROG
pin resistance. Turning Q1 off reduces the charge current
to IMAX/10 for battery conditioning. When Q1 is on, the
LTC4012-3 is programmed to allow full IMAX current for
bulk charge. This technique can be expanded through
the use of additional digital control inputs for an arbitrary
number of pre-programmed current values.
For a truly continuous range of maximum charge current
control, pulse width modulation can be used as shown
in Figure 4.
Figure 3. Programming 2-Level Charge Current
13
Q1
2N7002
4012-3 F03
R2
53.6k
PROG
LTC4012-3
R1
26.7k
CPROG
4.7nF
BULK
CHARGE
PRECHARGE
Figure 4. Programming PWM Current
13
Q1
2N7002
4012-3 F04
PROG
LTC4012-3
RPROG
RMAX
511k
CPROG
0V
5V
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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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