MAX1978 データシートの表示（PDF） - Maxim Integrated

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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.)

THERMAL STABILITY,

ROOM TEMPERATURE

THERMAL STABILITY,

HEATING MODE

TEMPERATURE ERROR

vs. AMBIENT TEMPERATURE

0.03

0.02

0.01

TEMPERATURE

TEMPERATURE

0.001°C/div

0.001°C/div

0

ITEC = +25°C

TA = +25°C

4s/div

TTEC = +25°C

TA = +5°C

4s/div

-0.01

-0.02

-0.03

-20 -10 0 10 20 30 40 50

AMBIENT TEMPERATURE (°C)

Pin Description

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

11

PVDD2

SHDN

Power 2 Inputs. Must be same voltage as VDD. Connect all PVDD2 inputs together at the VDD power plane.

Bypass to PGND2 with a 10µF ceramic capacitor.

Shutdown Control Input. Active-low shutdown control.

12

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

(typically +1.5°C) below 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,

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

26, 42, 43

17

DIFOUT Chopper-Stabilized Instrumentation Amp Output. Differential gain is 50 ✕ (FB+ - FB-).

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

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