参数资料
| 型号： | MAX1978EVKIT |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 18/20页 |
| 文件大小： | 0K |
| 描述： | EVAL KIT MAX1978 |
| 标准包装： | 1 |
| 系列： | * |
MAX1978/MAX1979
Integrated Temperature
Controllers for Peltier Modules
where:
Choose fp1 = 15Hz, find R1 using the following equation:
A = The gain needed to move the 0dB crossover point
up to the desired frequency. In this case, A = -4dB =
0.6.
fp 1 =
1
2 π × C 1 × R 1
fz 2 =
fp 2 =
f C = The desired crossover frequency, 1.5Hz in this
example.
C1 is found to be 0.58μF; use 0.47μF.
Next, the second TEC pole must be cancelled by
adding a zero. Canceling the second TEC pole pro-
vides maximum phase margin by adding positive
phase to the circuit. Setting a second zero (fz2) to at
least 1/5 the crossover frequency (1.5Hz/5 = 0.3Hz),
and a pole (fp1) to 5 times the crossover frequency or
higher (5 × 1.5Hz = 7.5Hz) ensures good phase margin,
while allowing for variation in the location of the TEC’s
second pole. Set the zero fz2 to 0.3Hz and calculate R2:
1
2 π × C 1 × R 2
where fz2 is the second zero.
R2 is calculated to be 1.1M ? ; use 1M ? .
Now pole fp1 is added at least 5 times the crossover
frequency to terminate zero fz2.
Resistor R1 is found to be 22k ? , use 20k ?
The final step is to terminate the first zero by setting the
rolloff frequency with a second pole, fp2. A good
choice is 2 times fp1.
Choose fp2 = 30Hz, find C3 using the following equation:
1
2 π × C 3 × R 3
where C3 is found to be 0.05μF, use 0.047μF.
Figure 7 displays the compensated gain and phase
plots for the above example.
The example given is a good place to start when com-
pensating the thermal loop. Different TEC modules
require individual testing to find their optimal compen-
sation scheme. Other compensation schemes can be
used. The above procedure should provide good
results for the majority of optical modules.
40
TEC GAIN AND PHASE
90
80
COMPENSATED
TEC GAIN AND PHASE
90
30
70
20
10
0
-10
-20
-30
-40
-50
45
0
-45
-90
60
50
40
30
20
10
0
-10
-20
-30
-40
45
0
-45
-90
-60
-70
-80
0.001
0.01
0.1
1
10
-135
-180
100
-50
-60
-70
-80
0.001
0.01
0.1
1
10
-135
-180
100
FREQUENCY (Hz)
Figure 6. Bode Plot of a Generic TEC Module
18
FREQUENCY (Hz)
Figure 7. Compensated Thermal-Control Loop Using the TEC
Module in Figure 6
Maxim Integrated
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