Datasheet

Integrated Temperature
Controllers for Peltier Modules
SWITCHING FREQUENCY CHANGE
vs. INPUT SUPPLY
MAX1978 toc10
V
DD
(V)
SWITCHING FREQUENCY CHANGE (kHz)
5.04.54.03.5
-30
-25
-20
-15
-10
-5
0
5
10
-35
3.0 5.5
REFERENCE VOLTAGE CHANGE
vs. INPUT SUPPLY
REFERENCE VOLTAGE CHANGE (mV)
-2.5
-2.0
-1.5
-1.0
-0.5
0
0.5
1.0
-3.0
MAX1978 toc11
V
DD
(V)
5.04.54.03.53.0 5.5
REFERENCE VOLTAGE CHANGE
vs. TEMPERATURE
MAX1978 toc12
TEMPERATURE (°C)
REFERENCE VOLTAGE CHANGE (mV)
6040200-20
-3
-2
-1
0
1
2
3
-4
-40 80
REFERENCE LOAD REGULATION
MAX1978 toc13
REFERENCE LOAD CURRENT (mA)
REFERENCE VOLTAGE CHANGE (mV)
0.80.6-0.2 0 0.2 0.4
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
-1.0
-0.4 1.0
SINK SOURCE
ATO VOLTAGE
vs. THERMISTOR TEMPERATURE
MAX1978 toc14
THERMISTOR TEMPERATURE (°C)
ATO VOLTAGE (V)
3020010
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
0
-10 40 50 60
NTC, 10kΩ THERMISTOR
CIRCUIT IN FIGURES 1 AND 2
STARTUP AND SHUTDOWN WAVEFORMS
MAX1978 toc15
100µs/div
V
SHDN
5V/div
I
TEC
500mA/div
I
DD
200mA/div
CTLI STEP RESPONSE
MAX1978 toc16
1ms/div
1.5V
0A
V
CTLI
1V/div
I
TEC
1A/div
INPUT SUPPLY STEP RESPONSE
MAX1978 toc17
1A
0V
V
DD
2V/div
I
TEC
20mA/div
10ms/div
THERMAL STABILITY,
COOLING MODE
MAX1978 toc18
4s/div
TEMPERATURE
0.001°C/div
I
TEC
= +25°C
T
A
= +45°C
Typical Operating Characteristics (continued)
(V
DD
= 5V, V
CTLI
= 1V, V
FREQ
= GND, RTEC = 1Ω, circuit of Figure 1, T
A
= +25°C, unless otherwise noted.)
MAX1978/MAX1979
8
Maxim Integrated