Datasheet

LTC2997
13
2997fa
TYPICAL APPLICATIONS
Figure 11. Analog PWM Heater Controller
Figure 12. 75°C Analog Heater Controller
5V
D
+
D
–
LTC2997
V
CC
V
PTAT
V
REF
V
TARGET
V
REF
GND
0.1µF
470pF
2997 F11
22k
1k
100k
100k 1M
5V
100µF
MEASURE TEMPERATURE AND SET
TARGET TEMPERATURE WITH
RESISTIVE DIVIDER
INTEGRATE
TEMPERATURE
ERROR
PWM
OSCILLATOR
100pF
10M
10M
10
R
HEATER
CET 3904
200k
ZXM64PO35
75k
–
+
–
+
LTC6079
LTC6079
5V
D
+
D
–
LTC2997
V
CC
V
PTAT
V
REF
GND
0.1µF
470pF
2997 F12
22k
V
TARGET
= 1.3917V
10
R
HEATER
IRF3708
CET 3904
75k
–
+
LTC6079
4mV/K
1.8V