DN1220 データシートの表示（PDF） - Unspecified

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DN1220

SUBMINIATURE THERMOELECTRIC COOLER CONTROLLER

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DN1220

Setting Up The DN1220 TEC Controller

Integrator Time Constant

Integrator Time Constant is set with resistor RTC that is connected between Pin 5 and Pin 6. A 1µF

integrator capacitor is internal to the DN1220. The time constant can be set from 0.2 second to an excess of

10 seconds. The integrator can be disabled by shorting Pin 6 to Pin 7. A minimum RT value of 100 kΩ is

recommended if the integrator is disabled. A 1 MΩ resistor, which produces an integrator time constant of

approximately 1 second, will be satisfactory in most applications.

RTC = T 0.1 MΩ

Where T is the integrator

time constant

T (Sec.)

0.2

1

10

RT MΩ

0.1

0.9

10.0

Output Current Limiting

Both maximum cooling and heating current supplied by the DN1220 can be independently set from 0 to 2

amperes by resistors RCL1 and RCL2. RCL1 is connected from Pin 8 to Pin 9 and limits the maximum current

that is supplied to the TEC in the heating mode. Likewise, RCL2 limits the maximum heating that is supplied

when cooling the TEC.

ICL

RCL

RCL =

10

4

I MAX

2

KΩ

2.0 A

1.0 A

0.5 A

0.0

∞

5 KΩ

1.67 KΩ

0Ω

Power Supply

The DN1220 operates on a single power supply from 5 to 12 Volts. This supply should be capable of supplying a

minimum of 2.5 amperes of current. This power supply is connected between Pin 11 and Pin 12 with the positve

voltage applied to Pin 12. A linear power supply is recommended for the application where a high degree of

temperature stability is required. However, a switch mode power supply will work for many applications.

The Power Output Stage

The TEC is connected to Pin 13 and Pin 14. Current flows out of Pin 13 into the TEC when cooling. This is

generally the red lead on the TEC. The TEC pin assignment is reversed if a positive coefficient thermistor is

used. Care should be taken not to short Pin 13 to ground or to the power supply, Pin 12. Otherwise,

damage to the DN1220 may occur.

TEC current can be monitored by placing an ammeter in series with the TEC as shown in the figure below.

DN1220 TEC

CONTROLLER

PIN 13

Pin 14

Ammeter

A

Figure 3

TEC

Page 4

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