TECEV103 Datasheet, PDF (4/5 Pages) List of Unclassifed Manufacturers – TEC CONTROLLER EVALUATION KIT TECEV103

Analog Technologies, Inc.
TECEV103
between CMPIN and CDRD test points; Rp can be read
off between CMPIN and CIRP test points.
4. After the compensation network is tuned properly, we
can now adjust set-point temperature to see if the TEC
controller can drive the target temperature to a certain
range and with high stability. Turn the temperature set-
point TMPS potentiometer W1 while monitoring its
output voltage at TMPS test point (4th row on either left
or right side of the board), watch the LED: when it turns
to green, the target temperature is locked to the set-point
temperature within 0.1°C or less. The relationship
between the set-point voltage vs. the set-point
temperature is given in the datasheet. After seeing the
LED lock into the set-point temperature, VDR should be
a constant voltage as shown in the oscilloscope and the
voltage between TMPS and TMPO should be very small,
less than 10mV. When a standard TEC controller is
used, the 10mV represent a 0.07° temperature error.
5. Set output voltage limit.
6. To know more parameters of the TEC controller.
a. To know the actual target temperature, use a voltage meter
to measure the voltage between the TMPO and the GND
pins, the reading result is: target temperature = 15°C +
(TMPO voltage (V))*6.67°C for approximation (see the
curve in the TEC controller data sheet).
b. To know how hard the TEC is working, measure the
voltage VDR by a voltage meter or an ADC, TEC voltage =
2.5V – VDR. When the TEC voltage (from the calculation)
is positive, it is in cooling mode; when the TEC voltage is
negative, it is in heating mode. Cool/Heat Balance CLHT
can be adjusted by W2. TEC maximum voltage can be
reduced by reducing W3, make sure Vlim switch is now
turned to the on position.
c. To try other values of capacitors not provided by the
evaluation board for the capacitors in the compensation
network, turn the capacitor switches you want to try to the
top point, the “0” position, connect the component to the
corresponding soldering pads as marked on the evaluation
board.
d. To shut down the TEC controller, turn the Power switch
to the “Off” position, see Figure 2.
e. To control the set-point temperature directly by using a
DAC, set the set-point temperature POT W1 to the middle
point (25°C), on which the TMPS is about 1.5V, the half
value of the reference voltage, connect TMPS test point to
the output of the DAC and use this formula for
approximation when the input voltage is between 0V and
3V:
set-point temperature (°C) = 15°C + (TMPO voltage
(V))*6.67°C. The maximum voltage allowed is Vps (power
supply). See the curve in the TEC controller data sheet.
f. To control the TEC voltage directly by using a DAC,
connect VDR to the output of the DAC and use this formula:
TEC voltage = 2.5V – VDR (V).
g. To shut down the TEC controller by using a
microprocessor, turn off the Power switch, connect SDN test
point (2nd row from the bottom side, on both left and right
columes.) to one of its digital outputs. When pulling low,
the TEC controller is shut off. When pulling high SDN, the
TEC controller is turned on.
h. The evaluation schematic is given in Figure 5.
Using the TEC controller for more applications not
described here, and/or having any questions, please free to
contact us.
550 E. Weddell Dr., #4, Sunnyvale, CA 94089 U. S. A. Tel.: [phone], Fax: [phone]. www.analogtechnologies.com
© Copyright 1999 – 2004, Analog Technologies, Inc. All Rights Reserved. Updated: 8/25/04
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