Datasheet

Integrated Temperature
Controllers for Peltier Modules
EFFICIENCY vs. TEC CURRENT
V
DD
= 5V
MAX1978 toc01
TEC CURRENT (A)
EFFICIENCY (%)
2.01.51.00.5
10
20
30
40
50
60
70
80
90
0
02.5
R
TEC
= 1.1Ω
EFFICIENCY vs. TEC CURRENT
V
DD
= 3.3V
MAX1978 toc02
TEC CURRENT (A)
2.0
1.50.5 1.0
10
20
30
40
50
60
70
80
0
0 2.5
R
TEC
= 0.855Ω
EFFICIENCY (%)
OUTPUT-VOLTAGE
RIPPLE WAVEFORMS
MAX1978 toc03
400ns/div
V
OS2
100mV/div
AC-COUPLED
V
OS1
100mV/div
AC-COUPLED
V
OS1
- V
OS1
50mV/div
INPUT SUPPLY RIPPLE
MAX1978 toc04
200ns/div
V
DD
20mV/div
AC-COUPLED
TEC CURRENT vs. CTLI VOLTAGE
MAX1978 toc05
20ms/div
V
CTLI
1V/div
I
TEC
2A/div
-0V
-0A
ZERO-CROSSING TEC CURRENT
MAX1978 toc06
1ms/div
V
CTLI
200mV/div
I
TEC
500mA/div
1.5V
0A
V
ITEC
vs. TEC CURRENT
MAX1978 toc07
TEC CURRENT (A)
V
ITEC
(V)
210-1-2
0.5
1.0
1.5
2.0
2.5
3.0
0
-3 3
TEC CURRENT vs. TEMPERATURE
MAX1978 toc08
TEMPERATURE (°C)
I
TEC
(A)
806040200-20
0.995
1.000
1.005
1.010
0.990
-40
I
TEC
= 1A
R
SENSE
= 0.68Ω
SWITCHING FREQUENCY
vs. TEMPERATURE
SWITCHING FREQUENCY (kHz)
494
496
498
500
502
504
506
508
492
MAX1978 toc09
TEMPERATURE (°C)
806040200-20-40
V
CTLI
= 1.5V
R
TEC
= 1Ω
Typical Operating Characteristics
(V
DD
= 5V, V
CTLI
= 1V, V
FREQ
= GND, RTEC = 1Ω, circuit of Figure 1, T
A
= +25°C, unless otherwise noted.)
MAX1978/MAX1979
Maxim Integrated
7