3V LOGIC OUTPUT TEMPERATURE
SENSOR WITH PROGRAMMABLE
HYSTERESIS
TC07
250
1
Cooling and Heating Applications
The TC07 can be used to control a DC fan as shown in
Figure 3. The fan turns on when the sensed temperature
rises above T
SET
and remains on until the temperature falls
below H
SET
. The amount of "over-cooling" performed by the
fan is dependent on the programmed hysteresis.
Figure 4 shows the TC07 acting as a heater thermostat.
Circuit operation is identical to that of the cooling fan
application.
RESISTANCE (kΩ)
200
2
3
4
150
100
50
-55
-35
-15
5
25
45
65
85
105
125
TEMPERATURE (°C)
Figure 2. Programming Resistor Values vs. Temperature
+2.7 to 5.5V
+12V
+2.7 to 5.5V
+12V
R
T
R
H
NC
V
DD
R
H
NC
V
DD
HEATER
R
T
H
SET
TC07
NC
+
DC FAN
H
SET
TC07
T
SET
NC
T
SET
OUT
OUT
LOGIC
LEVEL
MOSFET
GND
OUT
LOGIC
LEVEL
MOSFET
5
6
GND
OUT
TEMPERATURE
T
SET
TEMPERATURE
T
SET
H
SET
H
SET
7
HEATER "ON"
OUT
FAN "ON"
Figure 3. TC07 as a Fan Controller
OUT
Figure 4. TC07 as a Heater Thermostat
2-13
8
TELCOM SEMICONDUCTOR, INC.
TELCOM [ TELCOM SEMICONDUCTOR, INC ]
