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MAX1978/MAX1979
Integrated Temperature
Controllers for Peltier Modules
Typical Operating Characteristics (continued)
(V DD = 5V, V CTLI = 1V, V FREQ = GND, RTEC = 1 ? , circuit of Figure 1, T A = +25°C, unless otherwise noted.)
MPERATURE
0.001 ° C/div
THERMAL STABILITY,
ROOM TEMPERATURE
I TEC = +25 ° C
T A = +25 ° C
TEMPERATURE
0.001 ° C/div
THERMAL STABILITY,
HEATING MODE
T TEC = +25 ° C
T A = +5 ° C
0.03
0.02
0.01
0
-0.01
-0.02
-0.03
TEMPERATURE ERROR
vs. AMBIENT TEMPERATURE
4s/div
4s/div
-20
-10
0
10
20
30
40
50
AMBIENT TEMPERATURE ( ° C)
Pin Description
PIN
1
2, 8, 29,
35
3, 5
4, 6, 9
7, 10
11
12
13
NAME
OS2
N.C.
PGND2
LX2
PV DD 2
SHDN
OT
UT
FUNCTION
Output Sense 2. OS2 senses one side of the differential TEC voltage. OS2 is a sense point, not a power
output.
Not Internally Connected
Power Ground 2. Internal synchronous rectifier ground connections. Connect all PGND pins together at
power ground plane.
Inductor 2 Connection. Connect all LX2 pins together. Connect LX2 to LX1 when using the MAX1979.
Power 2 Inputs. Must be same voltage as V DD . Connect all PV DD 2 inputs together at the V DD power plane.
Bypass to PGND2 with a 10μF ceramic capacitor.
Shutdown Control Input. Active-low shutdown control.
Over-Temperature Alarm. Open-drain output pulls low if temperature feedback rises 20mV
(typically +1.5°C) above the set-point voltage.
Under-Temperature Alarm. Open-drain output pulls low if temperature feedback falls 20mV
(typically +1.5°C) below the set-point voltage.
14
INTOUT Integrator Amp Output. Normally connected to CTLI.
15
16, 25,
26, 42, 43
INT-
GND
Integrator Amp Inverting Input. Normally connected to DIFOUT through thermal-compensation network.
Analog Ground. Connect all GND pins to analog ground plane.
17
DIFOUT Chopper-Stabilized Instrumentation Amp Output. Differential gain is 50 ? (FB+ - FB-).
18
19
20
21
22
FB-
FB+
BFB-
BFB+
AIN+
Chopper-Stabilized Instrumentation Amp Inverting Input. Connect to thermistor bridge.
Chopper-Stabilized Instrumentation Amp Noninverting Input. Connect to thermistor bridge.
Chopper-Stabilized Buffered FB- Output. Used to monitor thermistor bridge voltage.
Chopper-Stabilized Buffered FB+ Output. Used to monitor thermistor bridge voltage.
Undedicated Chopper-Stabilized Amplifier Noninverting Input
Maxim Integrated
9
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