Integrated Temperature

Controllers for Peltier Modules

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9

Pin Description

THERMAL STABILITY,

ROOM TEMPERATURE

4s/div

TEMPERATURE

0.001

°C/div

°C

°C

THERMAL STABILITY,

HEATING MODE

4s/div

TEMPERATURE

0.001

°C/div

°C

°C

TEMPERATURE ERROR

vs. AMBIENT TEMPERATURE

AMBIENT TEMPERATURE (

°C)

30

40

10

20

0

-10

-0.02

-0.01

0

0.01

0.02

0.03

-0.03

-20

50

Typical Operating Characteristics (continued)

PIN

NAME

FUNCTION

1

OS2

Output Sense 2. OS2 senses one side of the differential TEC voltage. OS2 is a sense point, not a power

output.

2, 8, 29,

35

N.C.

Not Internally Connected

3, 5

PGND2

Power Ground 2. Internal synchronous rectifier ground connections. Connect all PGND pins together at

power ground plane.

4, 6, 9

LX2

Inductor 2 Connection. Connect all LX2 pins together. Connect LX2 to LX1 when using the MAX1979.

7, 10

Bypass to PGND2 with a 10µF ceramic capacitor.

11

SHDN

Shutdown Control Input. Active-low shutdown control.

12

OT

Over-Temperature Alarm. Open-drain output pulls low if temperature feedback rises 20mV

(typically +1.5°C) above the set-point voltage.

13

UT

Under-Temperature Alarm. Open-drain output pulls low if temperature feedback falls 20mV

(typically +1.5°C) below the set-point voltage.

14

INTOUT Integrator Amp Output. Normally connected to CTLI.

15

INT-

Integrator Amp Inverting Input. Normally connected to DIFOUT through thermal-compensation network.

16, 25,

26, 42, 43

GND

Analog Ground. Connect all GND pins to analog ground plane.

17

18

FB-

Chopper-Stabilized Instrumentation Amp Inverting Input. Connect to thermistor bridge.

19

FB+

Chopper-Stabilized Instrumentation Amp Noninverting Input. Connect to thermistor bridge.

20

BFB-

Chopper-Stabilized Buffered FB- Output. Used to monitor thermistor bridge voltage.

21

BFB+

Chopper-Stabilized Buffered FB+ Output. Used to monitor thermistor bridge voltage.

22

AIN+

Undedicated Chopper-Stabilized Amplifier Noninverting Input