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MAX1978

Integrated Temperature Controllers for Peltier Modules

Maxim Integrated 

Integrated Temperature

Controllers for Peltier Modules

Typical Operating Characteristics (continued)

(VDD = 5V, VCTLI = 1V, VFREQ = GND, RTEC = 1Ω, circuit of Figure 1, TA = +25°C, unless otherwise noted.)

SWITCHING FREQUENCY CHANGE

vs. INPUT SUPPLY

10

5

0

-5

-10

-15

-20

-25

-30

-35

3.0 3.5 4.0 4.5 5.0 5.5

VDD (V)

REFERENCE LOAD REGULATION

0.6

0.4

0.2

0

-0.2

-0.4

-0.6 SINK SOURCE

-0.8

-1.0

-0.4 -0.2 0 0.2 0.4 0.6 0.8 1.0

REFERENCE LOAD CURRENT (mA)

REFERENCE VOLTAGE CHANGE

vs. INPUT SUPPLY

1.0

0.5

0

-0.5

-1.0

-1.5

-2.0

-2.5

-3.0

3.0 3.5 4.0 4.5 5.0 5.5

VDD (V)

ATO VOLTAGE

vs. THERMISTOR TEMPERATURE

4.5

4.0 NTC, 10kΩ THERMISTOR

CIRCUIT IN FIGURES 1 AND 2

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0

-10 0 10 20 30 40 50 60

THERMISTOR TEMPERATURE (°C)

REFERENCE VOLTAGE CHANGE

vs. TEMPERATURE

3

2

1

0

-1

-2

-3

-4

-40 -20 0

20 40 60 80

TEMPERATURE (°C)

STARTUP AND SHUTDOWN WAVEFORMS

VSHDN

5V/div

ITEC

500mA/div

IDD

200mA/div

100µs/div

VCTLI

1V/div

ITEC

1A/div

CTLI STEP RESPONSE

1ms/div

INPUT SUPPLY STEP RESPONSE

THERMAL STABILITY,

COOLING MODE

VDD

2V/div

1.5V

ITEC

20mA/div

0A

TEMPERATURE

0V 0.001°C/div

1A

ITEC = +25°C

TA = +45°C

10ms/div

4s/div

8 _______________________________________________________________________________________

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