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參數(shù)資料
| 型號： | TMP12 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | Airflow and Temperature Sensor |
| 中文描述： | 氣流和溫度傳感器 |
| 文件頁數(shù)： | 13/14頁 |
| 文件大小： | 446K |
| 代理商： | TMP12 |
TMP12
REV. 0
–13–
High Current Switching
As mentioned earlier, internal dissipation due to large loads on
the TMP12 outputs will cause some temperature error due to
self-heating. External transistors buffer the load from the
TMP12 so that virtually no power is dissipated in the internal
transistors and minimal self-heating occurs. This section shows
several examples using external transistors. The simplest case
uses a single transistor on the output to invert the output signal
is shown in Figure 28. When the open-collector of the TMP12
turns “ON” and pulls the output down, the external transistor
Q1’s base will be pulled low, turning off the transistor. Another
transistor can be added to re-invert the signal as shown in Figure
29. Now, when the output of the TMP12 is pulled down, the
first transistor, Q1, turns off and its collector goes high, which
turns Q2 on, pulling its collector low. Thus, the output taken
from the collector of Q2 is identical to the output of the TMP12.
By picking a transistor that can accommodate large amounts of
current, many high power devices can be switched.
2N1711
V+
4.7k
I
C
Q1
TEMPERATURE
SENSOR &
VOLTAGE
REFERENCE
HYSTERESIS
GENERATOR
WINDOW
COMPARATOR
VPTAT
VREF
100
1
2
3
4
8
5
7
6
TMP12
Figure 28. An External Transistor Minimizes Self-Heating
MOTOR
SWITCH
RELAY
+12V
2N1711
V+
4.7k
I
C
4.7k
TIP-110
TEMPERATURE
SENSOR &
VOLTAGE
REFERENCE
HYSTERESIS
GENERATOR
WINDOW
COMPARATOR
VPTAT
VREF
100
1
2
3
4
8
5
7
6
+5V
TMP12
Figure 30. Darlington Transistor Can Handle Large Currents
Q1
Q2
2N1711
V+
4.7k
4.7k
2N1711
TEMPERATURE
SENSOR &
VOLTAGE
REFERENCE
HYSTERESIS
GENERATOR
WINDOW
COMPARATOR
VPTAT
VREF
100
1
2
3
4
8
5
7
6
TMP12
I
C
Figure 29. Second Transistor Maintains Polarity of TMP12
Output
An example of a higher power transistor is a standard
Darlington configuration as shown in Figure 30. The part cho-
sen, TIP-110, can handle 2 A continuous which is more than
enough to control many high power relays. In fact the
Darlington itself can be used as the switch, similar to
MOSFETs and IGBTs.
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|---|---|
| TMP12FP | Airflow and Temperature Sensor |
| TMP12FS | Airflow and Temperature Sensor |
| TMP12GBC | Airflow and Temperature Sensor |
| TMP17 | Low Cost, Current Output Temperature Transducer |
| TMP17FS | Low Cost, Current Output Temperature Transducer |
相關代理商/技術參數(shù) |
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|---|---|
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| TMP120-18 | 制造商:TRUMPOWER 制造商全稱:Tumbler Technologies + TRUMPower 功能描述:120 WATT MEDICAL POWER ADAPTERS |
| TMP120-19 | 制造商:TRUMPOWER 制造商全稱:Tumbler Technologies + TRUMPower 功能描述:120 WATT MEDICAL POWER ADAPTERS |
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