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HY-5610

SUBMINIATURE CONTROLLER FOR THERMOELECTRIC COOLERS

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hytek

Microsystems

HY-5610

TEC CONTROLLER

DESCRIPTION OF THE HY-5610 PIN OUTS

* Temperature Set Resistor Rs (Pin 1 to Pin 7)

The temperature set resistor for the HY-5610 controls the temperature at which the TEC will operate. When the circuit

has stabilized, the resistance of the thermistor will be equal to that of the set resistor Rs. For example, if a Dale 10kΩ

thermistor is used as the temperature sensing device, a set resistor of approximately 56kΩ will set an operating

temperature of -10oC. A graph of Rs vs. set temperature is shown in figure 4 when using a Dale 1M1002 thermistor.

* Thermistor, RT (Pin 6 to Pin 7)

The thermistor should be located in close proximity to the device being temperature controlled by the TEC. It should

be in good thermal contact to avoid stability problems.

The HY-5610 has been designed for a negative temperature coefficient thermistor. A thermistor with a positive

temperature coefficient can also be used if the position of the temperature set resistor and temperature sensing resistor

are changed. The same result can also be achieved by reversing the leads of the TEC in which case Rcc & RCH must

be interchanged.

* Gain Set Resistor, RG (Pin 5 to Pin 6)

The ratio of the gain set resistor RG to RL controls the response time of the servo loop. A ratio that is too large can

cause slow response and a ratio that is too small can cause loop instability. In most applications RG may not be

needed since a 10MΩ resistor is internal to the HY-5610 and generally provides enough gain for good operation.

* Loop Stability Network, RL and CL (Pin 3 to Pin 5)

The RC time constant of these two components is a first approximation of the thermal time constant of the servo loop.

The thermal time constant of the combination of the device being cooled, the thermistor, and the TEC can be

approximated by applying constant power to the TEC and measuring the length of time it takes to reach 66% of it’s

final temperature.

For example, if the thermal time constant was observed to be 5 seconds, then a 1uF capacitor and a 4.7MΩ could be

chosen as the loop stabilizing components. Typical values for loop compensation components are shown in Table 1.

Note: The values of RG, RL, and CL are generally selected by experiment. CL should be a low leakage nonpolarized

capacitor.

* Current Limit Resistors, Rcc & RCH (Pin 1 to Pin 3, and Pin 1 to Pin 2)

These resistors limit the maximum current that the HY-5610 can supply to the TEC when in the cooling cycle and in

the heating cycle. Rcc limits the maximum current for the cooling cycle and RCH limits the maximum current in the

heating cycle. This feature prevents damage to the TEC during turn-on. It is also often desirable to limit the

maximum value of heating current as much as 30% less than the maximum cooling current. This is because TECs

are much more efficient heating than cooling. Figure 5 shows the approximate values for Rcc & RCH required to

program a desired turn-on current. For example an Rcc value of 18KΩ will limit the maximum cooling current to 2

Amperes and an RCH value of 13.5KΩ will limit the maximum heating current to 0.6 Amperes.

* VDD (Pin 8 to Pins 11 & 12) +7 < VDD < +20 Volts

This input supplies the voltage to the internal circuitry of the HY-5610. The maximum current drain at this terminal is 5mA.

* Vs (Pin 10 to Pins 11 & 12) +3 < Vs < +12 Volts

This input supplies the voltage to the HY-5610 power drive circuitry. The maximum current drain at this terminal

should not exceed 2 Amperes.

* Thermoelectric Cooler, TEC (Pin 9 to Pin 13)

The cooling lead of the TEC should be connected to Pin 9 and the heating lead should be connected to Pin 13 of the

HY-5610. If the temperature of the thermistor is greater than the set temperature at turn-on, maximum cooling current

will flow into Pin 9 and out of Pin 13. Conversely, maximum heating current will flow into Pin 13 and out of Pin 9 if the

temperature of the thermistor is less than the set temperature at turn-on. The maximum turn-on current is limited by Rcc

and RCH. Once the TEC reaches it’s set temperature, the current through the TEC will decrease to exactly the value

required to maintain the correct set temperature.

hytek Microsystems 400 Hot Springs Rd. Carson City NV 89706 (702) 883-0820 Fax -0827 www.hytek.com

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