3V LOGIC OUTPUT TEMPERATURE
SENSOR WITH PROGRAMMABLE
HYSTERESIS
1
2
3
4
5
6
7
8
TC07
Cooling and Heating Applications
250
200
150
100
50
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 TSET and remains on until the temperature falls
below HSET. 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.
-55
-35
-15
5
25
45
65
85
105
125
TEMPERATURE (°C)
Figure 2. Programming Resistor Values vs. Temperature
+12V
+2.7 to 5.5V
+2.7 to 5.5V +12V
RH
RT
RH
VDD
NC
NC
VDD
NC
+
HEATER
DC FAN
HSET
RT
NC
HSET
TC07
LOGIC
LEVEL
MOSFET
TC07
OUT
OUT
TSET
GND
TSET
GND
OUT
OUT
LOGIC
LEVEL
MOSFET
TSET
T
SET
H
SET
HSET
OUT
OUT
HEATER "ON"
FAN "ON"
Figure 3. TC07 as a Fan Controller
Figure 4. TC07 as a Heater Thermostat
TELCOM SEMICONDUCTOR, INC.
2-13
TELCOM [ TELCOM SEMICONDUCTOR, INC ]
