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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)： | 12/14頁 |
| 文件大?。?/td> | 446K |
| 代理商： | TMP12 |
TMP12
REV. 0
–12–
Power FETs are popular for handling a variety of high current
dc loads. Figure 24 shows the TMP12 driving a P-channel
MOSFET transistor for a simple heater circuit. When the out-
put transistor turns on, the gate of the MOSFET is pulled down
to approximately 0.6 V, turning it on. For most MOSFETs a
gate-to-source voltage or Vgs on the order of -2 V to -5 V is suf-
ficient to turn the device on. Figure 25 shows a similar circuit
for turning on an N-channel MOSFET, except that now the
gate to source voltage is positive. For this reason an external
transistor must be used as an inverter so that the MOSFET will
turn on when the trip point pulls down.
NC
IRFR9024
OR EQUIV
HEATING
ELEMENT
2.4k
(12V)
1.2k
(6V)
5%
V+
TEMPERATURE
SENSOR &
VOLTAGE
REFERENCE
HYSTERESIS
GENERATOR
WINDOW
COMPARATOR
VPTAT
VREF
100
1
2
3
4
8
5
7
6
+5V
TMP12
NC = NO CONNECT
Figure 24. Driving a P-Channel MOSFET
IRF130
NC
2N1711
HEATING
ELEMENT
V+
4.7k
4.7k
TEMPERATURE
SENSOR &
VOLTAGE
REFERENCE
HYSTERESIS
GENERATOR
WINDOW
COMPARATOR
VPTAT
VREF
100
1
2
3
4
8
5
7
6
+5V
TMP12
Figure 25. Driving an N-Channel MOSFET
Isolated Gate Bipolar Transistors (IGBTs) combine many of the
benefits of power MOSFETs with bipolar transistors and are
used for a variety of high power applications. Because IGBTs
have a gate similar to MOSFETs, turning on and off the devices
is relatively simple as shown in Figure 26. The turn on voltage
for the IGBT shown (IRGB40S) is between 3.0 and 5.5 volts.
This part has a continuous collector current rating of 50 A and a
maximum collector to emitter voltage of 600 V, enabling it to
work in very demanding applications.
IRGBC40S
NC
2N1711
V+
4.7k
4.7k
MOTOR
CONTROL
+5V
TEMPERATURE
SENSOR &
VOLTAGE
REFERENCE
HYSTERESIS
GENERATOR
WINDOW
COMPARATOR
VPTAT
VREF
100
1
2
3
4
8
5
7
6
TMP12
NC = NO CONNECT
Figure 26. Driving an IGBT
The last class of high power devices discussed here are Thyristors,
which include SCRs and Triacs. Triacs are a useful alternative to
relays for switching ac line voltages. The 2N6073A shown in Fig-
ure 27 is rated to handle 4 A (rms). The opto-isolated MOC3021
Triac shown features excellent electrical isolation from the noisy ac
line and complete control over the high power Triac with only a
few additional components.
NC
V+ = 5V
300
150
MOC3011
1
2
3
4
5
6
LOAD
AC
2N6073A
NC = NO CONNECT
TEMPERATURE
SENSOR &
VOLTAGE
REFERENCE
HYSTERESIS
GENERATOR
WINDOW
COMPARATOR
VPTAT
VREF
100
1
2
3
4
8
5
7
6
+5V
TMP12
Figure 27. Controlling the 2N6073A Triac
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 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 |
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