參數(shù)資料
型號(hào)： ISL6297CRZ-T
廠商： INTERSIL CORP
元件分類(lèi)： 電源管理
英文描述： Li-ion/Li Polymer Battery Charger
中文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC16
封裝： 4 X 4 MM, ROHS COMPLIANT, PLASTIC, MO-220VGGC, QFN-16
文件頁(yè)數(shù)： 14/16頁(yè)
文件大?。?/td> 432K
代理商： ISL6297CRZ-T
14
FN9215.0
September 27, 2005
The ratio, K, of the TEMP pin voltage to the bias voltage is:
(EQ. 8)
and
(EQ. 9)
At V
TMIN
,
(EQ. 10)
Similarly, at V
TMAX
.
(EQ. 11)
Using these equations to calculate the ratio of the thermistor
hot to cold resistance results in:
(EQ. 12)
and
(EQ. 13)
where R
TCOLD
and R
THOT
are the NTC thermistor
resistance values at the cold and hot temperature limits
respectively.
It is usually difficult to find an NTC thermistor that has the
exact ratio given in EQ. 12. A thermistor with a ratio larger
than 6.84, that is:
(EQ. 14)
can be used in series with a regular resistor to form an
effective thermistor that has the right ratio, as shown in
Figure 12.
With the series resistor R
S
, EQ. 12 can be re-written as:
(EQ. 15)
Once the thermistor and the temperature limits are selected,
R
S
and R
U
can be calculated using:
(EQ. 16)
and
(EQ. 17)
To summarize, the NTC thermistor circuit design requires
three steps:
1. Find an NTC thermistor that satisfies EQ. 14. The
temperature limits are determined by the application
requirement.
2. Calculate the series resistance according to EQ. 16.
3. Calculate the pull-up resistance according to EQ. 17.
Example:
The charger is designed to charge the battery with the
temperature range from -5°C to 45°C. The 10k
NTC
thermistor NCP15XH103F03RC from Murata
(http://www.murata.com) satisfies EQ. 14. The resistance
values for this thermistor are given in Table 3. The typical
resistance at -5°C and 45°C are:
R
TCOLD
= 33.8922k
and
R
THOT
= 4.9169k
.
Using EQ. 16 and EQ. 17 result in:
R
S
= 41.6
and R
U
= 14.931k
.
Selecting R
S
= 41.2
and R
U
= 15k
gives a low
temperature threshold of -5.1°C and a high temperature
threshold of 44.9°C.
K
R
+
R
T
R
U
---------------------
=
R
T
K
-----–
R
×
U
=
K
-----------
0.6844
=
=
K
2.88
--------------
0.2493
=
=
R
THOT
-----------------------
2.27R
0.332R
U
·
-----------------------
6.84
=
=
R
U
0.44R
TCOLD
=
R
THOT
-----------------------
6.84
≥
FIGURE 12. EFFECTIVE NTC THERMISTOR CIRCUIT
ISL6297
V2P8
TEMP
GND
R
U
R
T
R
S
E
T
TABLE 3. RESISTANCE TABLE OF NCP15XH103F03RC
TEMP (°C)
R-LOW (k
)
R-CENTER (k
)
R-HIGH (k
)
-10
41.4765
42.5062
43.5570
-5
33.1462
33.8922
34.6515
0
26.6780
27.2186
27.7675
6
20.7560
21.1230
21.4944
7
19.9227
20.2666
20.6143
40
5.7443
5.8336
5.9238
45
4.8333
4.9169
5.0015
50
4.0833
4.1609
4.2395
55
3.4634
3.5350
3.6076
R
S
R
+
THOT
----------+
6.84
=
R
S
R
-------------------------------------------------------------
6.84R
–
=
R
U
0.44
R
S
R
TCOLD
+
(
)
×
=
ISL6297
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