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MAX1978/MAX1979
Integrated Temperature
Controllers for Peltier Modules
The MAX1979 controls the TEC current in only one
direction (unipolar). Set the maximum unipolar TEC cur-
rent by applying a voltage to MAXIP. Connect MAXIN to
MAXIP when using the MAX1979. The equation for set-
FB-
REF
ting MAXIP is the same for the MAX1978 and
MAX1979. Do not exceed the positive or negative cur-
rent-limit specifications on the TEC. Refer to the TEC
MAX1978
MAX1979
C REF
manufacturer’s data sheet for these limits.
FB+
V SETPOINT
V THERMISTOR
Setting Max TEC Voltage
Apply a voltage to MAXV to control the maximum differ-
ential TEC voltage. MAXV can vary from 0 to REF. The
voltage across the TEC is four times V MAXV and can be
positive or negative.
FB-
|V OS1 - V OS2 | = 4 V MAXV
REF
Use resistors from 10k ? to 100k ? to form a voltage-
MAX1978
MAX1979
C REF
V THERMISTOR
divider to set V MAXV .
FB+
V SETPOINT
DAC
DIGITAL
INPUT
Thermal-Control Loop
The MAX1978/MAX1979 provide all the necessary
amplifiers needed to create a thermal-control loop.
Typically, the chopper-stabilized instrumentation ampli-
fier generates an error signal and the integrator amplifi-
er is used to create a PID controller. Figure 4 shows an
example of a simple PID implementation. The error sig-
nal needed to control the loop is generated from the
difference between the set point and the thermistor
voltage. The desired set-point voltage can be derived
from a potentiometer, DAC, or other voltage source.
Figure 5 details the required connections. Connect the
output of the PID controller to CTLI. For details, see the
Applications Information section.
Figure 5. The Set Point can be Derived from a Potentiometer
or a DAC
Control Inputs/Outputs
TEC Current Control
The voltage at CTLI directly sets the TEC current. CTLI
typically is driven from the output of a temperature-con-
trol circuit C INTOUT . For the purposes of the following
equations, it is assumed that positive TEC current is
heating.
The transfer function relating current through the TEC
(I TEC ) and V CTLI is given by:
C3
I TEC = (V CTLI - V REF ) / (10 R SENSE )
C1
R1
R3
C2
where V REF is 1.50V
and I TEC = (V OS1 - V CS ) / R SENSE
INT-
V CTLI is centered around REF (1.50V). I TEC is zero when
V CTLI = 1.50V. When V CTLI > 1.50V, the MAX1978 is heat-
DIFOUT
R2
INTOUT
ing. Current flow is from OS2 to OS1. The voltages are:
V OS2 > V OS1 > V CS
REF
Figure 4. Proportional Integral Derivative Controller
16
when V CTLI < 1.50V, current flows from OS1 to OS2:
V OS2 < V OS1 < V CS
Maxim Integrated
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