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參數(shù)資料
| 型號： | ADN8831 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Thermoelectric Cooler (TEC) Controller |
| 中文描述： | 熱電制冷器（TEC）控制器 |
| 文件頁數(shù)： | 9/11頁 |
| 文件大?。?/td> | 505K |
| 代理商： | ADN8831 |
PRELIMINARY TECHNICAL DATA
ADN8831
THEORY OF OPERATION
Introduction
Rev. C | Page 9 of 11
The ADN831 is a thermoelectric cooler (TEC) controller used
to set and stabilize the temperature of the TEC. A voltage
applied to the input of the ADN8831 corresponds to a target
temperature set-point. Using a thermistor to monitor the
current temperature of the target object, the ADN8831 applies
the appropriate current to the TEC to pump heat either towards
or away from the target object until the set-point temperature is
reached.
Self correcting auto-zero amplifiers (chop1 and chop2) are used
in the input and compesation stages of the aDN8831 to provide
a maximum offset voltage of 100uV over time and temperature.
This results in a final temperature accuracy of 0.01C in typical
applications, eliminating the ADN8831 as an error source in the
temperature control loop.
The TEC is driven differentially using an H-bridge
configuration. The ADN8831 drives external transistors that are
used to provide the current to the TEC. The maximum voltage
across the TEC and current flowing through the TEC can be set
using the VLIM and ILIM pins. Additional details are provided
in the Setting Voltage and Current Limits section.
One side of the H-bridge uses a switched output, while the
other is linear. This proprietary configuration allows the
ADN8831 to provide efficiency of >90%, while minimizing
external filtering component count. The ADN8831 requires
only one inductor and one capacitor to filter the switching
frequency of the switched output. For most applications, a
4.7uH inductor, a 22uF capacitor and a switching frequency of
1MHz maintains less than 0.5% worst-case output voltage ripple
across the TEC.
The switched output is controlled by the ADN8831’s oscillator.
A single resistor on the FREQ pin (pin #13) sets the switching
frequency from 100kHz to 1MHz. The clock output is available
at the SYNCO pin (pin #15). Connecting SYNCO to the SYNI
pin of another ADN8831 allows multiple ADN8831s to be
driven using a single clock.
The clock phase can be changed using a simple resistor divider
at the PHASE pin )pin #10). Phase adjustment allows two or
more ADN8831 devices to operate from the same clock
frequency and not have all outputs switch simultaneously,
which could create excessive power supply ripple. Details of
how to adjust the clock frequency and phase are provided in the
Setting the Frequency section.
The logic output of the TEMPGD pin (pin #11) indicates when
the target temperature is reached. Shutdown, standby, and true
current-sensing are also provided by the ADN8831 to protect
from catastrophic system failures that could damage the TEC.
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