Analog Devices ADN8831, Примечание к применению

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AN-695
APPLICATION NOTE
One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.com
Using the ADN8831 TEC Controller Evaluation Board
Rev. C | Page 1 of 12
INTRODUCTION
The ADN8831 is a thermoelectric cooler (TEC) controller
that drives medium power TECs (<4 A current) with excellent
temperature control resolution, stability, and high power
efficiency. The ADN8831 integrates two high performance
amplifiers dedicated to temperature sensing and thermal loop
compensation, allowing direct interface to a thermistor, a resistive
temperature device (RTD), or other temperature sensors.
When used in conjunction with the ADN8831 data sheet, this
application note describes how to configure the ADN8831-EVALZ
evaluation board (Version 4.0), and how to develop a real TEC
control circuit with an ADN8831. The ADN8831 data sheet
provides the detailed technical specifications and internal
functional block diagrams, as well as the application design
guidelines.
Important layout design guidelines are available in the
Evaluation Board Layout section of this application note.
EVALUATION BOARD DESCRIPTION
The ADN8831 evaluation board offers a configurable design
platform to work with various TECs and thermistors. On the
evaluation board, the ADN8831 delivers and controls a bidirec-
tional TEC current using two pairs of complementary MOSFETs
in an H-bridge configuration.
With the on-board, adjustable components, the evaluation
board provides configurability of temperature setpoint, tem-
perature setpoint range, TEC current and/or voltage limits, and
a PID compensation network. The temperature setpoint range
(factory default) circuit, optimized to work with 10 kΩ negative
temperature coefficient thermistors, can also work with other
types of temperature sensors. The tunable PID compensation
network allows the characteristic matching between the control
circuit and the thermal load for achieving the fastest response
time and temperature control stability. A green LED illuminates
when the TEMOUT voltage is within ±100 mV of the TEMPSET
setpoint voltage.
FUNCTIONAL BLOCK DIAGRAM
TEC
THERMISTOR
ON
OFF
ON
STANDBY
LED
ADN8831
ADN8831 EVALUATION BOARD
POWER
SUPPLY
EXTERNAL
COMPONENTS
TUNABLE
COMPENSATION NETWORK
SETPOINT
TEMPERATURE
RANGE
CONFIGURATION
POTENTIOMETERS
SETPOINT
TEMPERATURE
ADJUSTMENT
POTENTIOMETER
CURRENT AND
VOLTAGE LIMIT
CONFIGURATION
POTENTIOMETERS
04
59
2-
0
01
Figure 1. Functional Block Diagram of ADN8831 Evaluation Board