參數(shù)資料
型號(hào)： LTC3711
廠商： Linear Technology Corporation
英文描述： 4A, High Efficiency, Standalone Li Battery Charger
中文描述： 第4A，高效，獨(dú)立鋰電池充電器
文件頁(yè)數(shù)： 16/20頁(yè)
文件大?。?/td> 241K
代理商： LTC3711
16
LTC4007
4007i
between the CLP and CLN pins. When this voltage exceeds
100mV, the amplifier will override programmed charging
current to limit adapter current to 100mV/R
CL
. A lowpass
filter formed by 5k
and 15nF is required to eliminate
switching noise. If the current limit is not used, CLP should
be connected to DCIN.
Note that the I
CL
pin will be asserted when the voltage
across R
CL
is 93mV, before the adapter limit regulation
threshold.
Setting Input Current Limit
To set the input current limit, you need to know the
minimum wall adapter current rating. Subtract 5% for the
input current limit tolerance and use that current to deter-
mine the resistor value.
R
CL
= 100mV/I
LIM
I
LIM
= Adapter Min Current –
(Adapter Min Current 5%)
Table 5. Common R
CL
Resistor Values
ADAPTER
RCL VALUE*
RATING (A)
(
) 1%
1.5
1.8
2
0.045
2.3
0.039
2.5
0.036
2.7
0.033
3
* Values shown above are rounded to nearest standard value.
As is often the case, the wall adapter will usually have at
least a +10% current limit margin and many times one can
simply set the adapter current limit value to the actual
adapter rating (see Table 5).
RCL POWER
DISSIPATION (W)
0.135
0.162
0.18
0.206
0.225
0.241
0.27
RCL POWER
RATING (W)
0.25
0.25
0.25
0.25
0.5
0.5
0.5
0.06
0.05
0.03
Designing the Thermistor Network
There are several networks that will yield the desired
function of voltage vs temperature needed for proper
operation of the thermistor. The simplest of these is the
voltage divider shown in Figure 9. Unfortunately, since the
HIGH/LOW comparator thresholds are fixed internally,
there is only one thermistor type that can be used in this
APPLICATIOU
W
U
U
network; the thermistor must have a HIGH/LOW resis-
tance ratio of 1:7. If this happy circumstance is true for
you, then simply set R9 = R
TH(LOW)
If you are using a thermistor that doesn’t have a 1:7 HIGH/
LOW ratio, or you wish to set the HIGH/LOW limits to
different temperatures, then the more generic network in
Figure 10 should work.
Figure 9. Voltage Divider Thermistor Network
Figure 10. General Thermistor Network
LTC4007
NTC
R9
9
C7
R
TH
4007 F09
LTC4007
NTC
R9
9
C7
R9A
R
TH
4007 F10
Once the thermistor, R
TH
, has been selected and the
thermistor value is known at the temperature limits, then
resistors R9 and R9A are given by:
For NTC thermistors:
R9 = 6 R
TH(LOW)
R
TH(HIGH)
/(R
TH(LOW)
– R
TH(HIGH)
)
R9A = 6 R
TH(LOW)
R
TH(HIGH)
/(R
TH(LOW)
– 7 R
TH(HIGH)
)
For PTC thermistors:
R9 = 6 R
TH(LOW)
R
TH(HIGH)
/(R
TH(HIGH)
– R
TH(LOW)
)
R9A = 6 R
TH(LOW)
R
TH(HIGH)
/(R
TH(HIGH)
– 7
R
TH(LOW)
)
Example #1: 10k
NTC with custom limits
TLOW = 0
°
C, THIGH = 50
°
C
R
TH
= 10k at 25
°
C,
R
TH(LOW)
= 32.582k at 0
°
C
R
TH(HIGH)
= 3.635k at 50
°
C
R9 = 24.55k
→
24.3k (nearest 1% value)
R9A = 99.6k
→
100k (nearest 1% value)
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