Datasheet

DRV102
17
SBVS009B
www.ti.com
FIGURE 18. (a) Constant Temperature Controller. (b) Improved Accuracy Constant Temperature Controller.
On/Off
Thermistor
DRV102
REF200
V
S
Heating
Element
Duty Cycle
Adjust
1
Delay
Adjust
2
Gnd43
5
6
Out
12
0.1µF
2µF Film
7
2
3
4
6
100µA 100µA
1kΩ
10kΩ
10MΩ
OPA134
IN4148
(1)
or
Thermistor
5kΩ at +25°C
20kΩ
4.7V
Integrator improves accuracy
NOTE: (1) Or any common silicon diode suited
to the mechanical mounting requirements.
Temperature
Control
Higher temperature results
in lower duty cycle.
Higher temperature results
in lower duty cycle.
7, 8
R
1
R
2
0.1µF
On/Off
DRV102
Heating
Element
Duty
Cycle
Adjust
a)
b)
1
Delay
Adjust
2
Gnd43
5
V
S
V
S
6
Out
10µF