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3
TEC-A1LD
Analog Technologies, Inc.
Pin 6, VTEC, TEC voltage indication. TEC voltage = [max. TEC voltage]*[Vps
− 2*VTEC]/Vps. When
TECCRT is used to control the TEC voltage directly, measure TECCRT to derive the TEC voltage
instead, and use this formula: TEC voltage = Vps
− 2*TECCRT. The maximum driving current of pin
VTEC is 30mA and the output voltage swing is 0V to Vps.
Pin 7, CMIN, compensation input pin for the thermal control loop. Leave it open in production. When
prototyping, use this pin with a tuner on the evaluation board, TTV2.1 (produced by ATI) to tune the
compensation network to match the characteristics of the thermal load.
Pin 8, TEMP, actual target temperature. It swings from 0V to Vps, corresponds to 15
°C to 37°C when
Vps is 3.3V and 15
°C to 50°C when Vps equals 5V, see the curve in the below.
Pin 9, SDNG, shut down control. When pulled low, it shuts down the controller. Leave it open or pull it
high to activate the controller. This pin is internal pull up by a resister of 100K to Vps.
Pin 10, GND, signal ground, internally connected to Pin 4 GND. Can be used for connecting the
thermistor.
Pin 11, RTH, connect to the thermistor for sensing the target temp. Thermistor’s other end connects to
the signal ground, pin 4 or pin 10. Rth = 10K
Ω @ 25°C. Other thermistors or temperature sensors can
also be used, Consult with us.
Pin 12, TECPOS, connects to TEC positive terminal.
Pin 13, TECNEG, connects to TEC negative terminal.
Pin 14, PGND, power ground for connecting to the power supply.
Pin 15, PGND, power ground for connecting to the power supply, internally connected with pin 14.
Pin 16, VPS, positive power supply rail. Two possible values: 3.3V and 5V, depending on the module.
Mounting the TEC controller on PCB’s
The TEC controllers come in two types of packages: surface mount and through hole.
The surface
mount package has to be soldered manually, not by reflow oven. The through hole package can be
mounted through a socket, soldered manually, or by wave soldering machine.
Customizations
It is often found that some of the default specifications do not meet our users particular need. We offer
customizations on these specifications:
1. Maximum output voltage across TEC. When ordering, the part number will become:
TEC-A1LD-5V-(max. TEC voltage)-D. E.g., TEC-A1LD-5V-2.5V-D.
2. Set-point temperature range. When ordering, specify the lower limit, the upper limit, and the open
circuit temperature. The part number will become:
TEC-A1LD-5V-2.5V-(lower temp. limit)/(upper temp. limit)/(open circuit temp.),
where lower temp. limit is the temperature corresponding to
TEMPSP = 0V; upper temp. limit is
the corresponding to
TEMPSP = 3V; open circuit temp. corresponding to TEMPSP = 1.5V or
being left unconnected. E.g., TEC-A1LD-5V-2.5V-D (20/80/50).
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