參數(shù)資料
型號： TPS65072TRSLRQ1
廠商： TEXAS INSTRUMENTS INC
元件分類： 電源管理
英文描述： POWER SUPPLY SUPPORT CKT, PQCC48
封裝： 6 X 6 MM, 0.4 MM PITCH, PLASTIC, QFN-48
文件頁數(shù)： 65/90頁
文件大小： 1375K
代理商： TPS65072TRSLRQ1
2.25V
RT1
NTC
TS
RT2
+
-
+
-
V
(45)
HOT
V
(0)
COLD
1
0
( )
25
B
T
NTC
R
T
R
e
-
÷
÷
è
è
=
2.25V
RT1
NTC
TS
RT2
+
-
+
-
RT3
V
(45)
HOT
V
(0)
COLD
SLVSAP7 – JANUARY 2011
www.ti.com
For best performance, the NTC needs to be linearized by connecting a resistor (RT2) in parallel to the NTC as
shown in Figure 46. The resistor value of RT2 needed for linearization can be found in Table 8.
If the battery charger needs to be operated without a NTC connected, e.g. for test purposes, a resistor of 10k or
100k needs to be connected from TS to GND, depending for which NTC is configured to in register
CHCONFIG1.
Figure 45. Linearizing the NTC
Changing the Charging Temperature Range (Default 0°C to 45°C)
The battery charger is designed to operate with the two NTCs listed above. These will give a cold and hot
temperature threshold of 0°C and 45°C. If the charger needs to operate (charge) in a wider temperature range
e.g. –5°C to 50°C, the circuit can be modified accordingly. The NTC changes its resistance based on the
equation listed below:
(18)
With:
R25 = NTC resistance at 25°C
T = temperature in Kelvin
T0 = reference temperature (298K)
Resistor RT2 in parallel to the NTC is used to linearize the resistance change with temperature of the NTC. As
the NTC has a high resistance at low temperature, the resulting resistance of NTC in parallel with RT2 is lower
especially for low temperatures where the NTC has a high resistance, so RT2 in parallel has a significant impact.
For higher temperatures, the resistance of the NTC dropped significantly, so RT2 in parallel does not change the
resulting resistance a lot. See Figure 46.
Figure 46. Changing the Temperature Range
68
Copyright 2011, Texas Instruments Incorporated
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