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MAX1978/MAX1979
Integrated Temperature
Controllers for Peltier Modules
Detailed Description
Power Stage
The power stage of the MAX1978/MAX1979
thermoelectric cooler (TEC) temperature controllers
consists of two switching buck regulators that operate
together to directly control TEC current. This configura-
tion creates a differential voltage across the TEC, allow-
ing bidirectional TEC current for controlled cooling and
heating. Controlled cooling and heating allow accurate
TEC temperature control within the tight tolerances of
laser driver specifications.
The voltage at CTLI directly sets the TEC current. The
internal thermal-control loop drives CTLI to regulate
V DD
TEC temperature. The on-chip thermal-control circuitry
can be configured to achieve temperature control sta-
bility of 0.001°C. Figure 1 shows a typical TEC thermal-
control circuit.
Ripple Cancellation
Switching regulators like those used in the
MAX1978/MAX1979 inherently create ripple voltage on
each common-mode output. The regulators in the
MAX1978 switch in phase and provide complementary
in-phase duty cycles, so ripple waveforms at the differ-
ential TEC output are greatly reduced. This feature sup-
presses ripple currents and electrical noise at the TEC
to prevent interference with the laser diode while mini-
mizing output capacitor filter size.
REF
10 μ F
10 μ F
10 μ F
1 μ F
UNDERTEMP
ALARM
0.01 μ F
V DD
COMP
UT
SHDN
PV DD 1
PV DD 2
REF MAXV MAXIN MAXIP
LX1
CS
3 μ H
1 μ F
OVERTEMP
ALARM
OT
0.068 ?
DC CURRENT
MONITOR
20k ?
1%
ITEC
MAX1978
OS1
4.7 μ F
TEC
BFB-
THERMISTOR
VOLTAGE
80.6k ?
1 μ F
AIN-
AOUT
OS2
3 μ H
MONITOR
LX2
REF
69.8k ?
1%
105k ?
1%
AIN+
CTLI
FREQ
GND
PGND2 PGND1
INTOUT
INT-
FB-
DIFOUT FB+
1 μ F
REF
THERMAL
FEEDBACK
100k ?
10k ?
100k ?
0.047 μ F
10 μ F
0.47 μ F
1M ?
20k ?
Figure 1. MAX1978 Typical Application Circuit. Circuit is configured for both cooling and heating the NTC thermistor. Current flowing
from OS2 and OS1 is cooling.
12
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