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

Pin Description (continued)

PIN

NAME

FUNCTION

23

AIN- Undedicated Chopper-Stabilized Amplifier Inverting Input

24

AOUT Undedicated Chopper-Stabilized Amplifier Output

27, 30

PVDD1

Power 1 Inputs. Must be same voltage as VDD. Connect all PVDD1 inputs together at the VDD power plane.

Bypass to PGND1 with a 10µF ceramic capacitor.

28, 31, 33 LX1 Inductor 1 Connection. Connect all LX1 pins together. Connect LX1 to LX2 when using the MAX1979.

32, 34

PGND1 Power Ground 1. Internal synchronous-rectifier ground connections. Connect all PGND pins together at

power ground plane.

36

FREQ Switching-Frequency Select. Low = 500kHz, high = 1MHz.

37

ITEC TEC Current Monitor Output. The ITEC output voltage is a function of the voltage across the TEC current-

sense resistor. VITEC = 1.50V + (VOS1 - VCS) ✕ 8.

38

COMP Current-Control Loop Compensation. For most designs, connect a 10nF capacitor from COMP to GND.

39

MAXIP Maximum Positive TEC Current. Connect MAXIP to REF to set default positive current limit +150mV / RSENSE.

40

MAXIN Maximum Negative TEC Current. Connect MAXIN to REF to set default negative current limit

-150mV / RSENSE. Connect MAXIN to GND when using the MAX1979.

41

MAXV Maximum Bipolar TEC Voltage. Connect an external resistive divider from REF to GND to set the maximum

voltage across the TEC. The maximum TEC voltage is 4 ✕ VMAXV.

44

VDD Analog Supply Voltage Input. Bypass to GND with a 10µF ceramic capacitor.

TEC Current-Control Input. Sets differential current into the TEC. Center point is 1.50V (no TEC current).

45

CTLI Connect to INTOUT when using the thermal control loop. ITEC = (VOS1 - VCS) / RSENSE = (VCTLI - 1.50) / (10 ✕

RSENSE). When (VCLTI - VREF) > 0, VOS2 > VOS1 > VCS.

46

REF 1.5V Reference Voltage Output. Bypass REF to GND with a 1µF ceramic capacitor.

47

CS Current-Sense Input. The current through the TEC is monitored between CS and OS1. The maximum TEC

current is given by 150mV / RSENSE and is bipolar for the MAX1978. The MAX1979 TEC current is unipolar.

48

OS1 Output Sense 1. OS1 senses one side of the differential TEC voltage. OS1 is a sense point, not a power

output.

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