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参数资料
| 型号： | MAX1978ETM |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 温度/湿度传感器 |
| 英文描述： | Integrated Temperature Controllers for Peltier Modules |
| 中文描述： | DIGITAL TEMP SENSOR-SERIAL, 1Cel, SQUARE, SURFACE MOUNT |
| 封装： | EXPOSED PAD, TQFP-48 |
| 文件页数： | 18/20页 |
| 文件大小： | 620K |
| 代理商： | MAX1978ETM |
M
where:
A = The gain needed to move the 0dB crossover point
up to the desired frequency. In this case, A = -4dB =
0.6.
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:
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.
Choose fp1 = 15Hz, find R1 using the following equation:
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:
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.
Chip Information
TRANSISTOR COUNT: 6023
PROCESS: BiCMOS
fp
C
R
2
1
2
3
3
=
×
×
π
fp
C
R
1
1
2
1
1
=
×
×
π
fz
C
R
2
1
2
1
2
=
×
×
π
Integrated Temperature
Controllers for Peltier Modules
18
______________________________________________________________________________________
TEC GAIN AND PHASE
FREQUENCY (Hz)
G
P
10
1
0.1
0.01
-70
-80
-60
-50
-40
-30
-20
-10
0
10
20
-135
-90
-45
0
45
30
40
90
-180
0.001
100
Figure 6. Bode Plot of a Generic TEC Module
COMPENSATED
TEC GAIN AND PHASE
FREQUENCY (Hz)
G
P
10
1
0.1
0.01
-30
-40
-50
-60
-70
-20
-10
0
10
20
30
40
50
60
-135
-90
-45
0
45
70
80
-80
90
-180
0.001
100
Figure 7. Compensated Thermal-Control Loop Using the TEC
Module in Figure 6
相关PDF资料 |
PDF描述 |
|---|---|
| MAX1979ETM | Integrated Temperature Controllers for Peltier Modules |
| MAX197ACWI | Multi-Range (【10V, 【5V, +10V, +5V), Single +5V, 12-Bit DAS with 8+4 Bus Interface |
| MAX197AMYI | Circular Connector; No. of Contacts:18; Series:MS27505; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:15; Circular Contact Gender:Socket; Circular Shell Style:Box Mount Receptacle RoHS Compliant: No |
| MAX197AEAI | Multi-Range (【10V, 【5V, +10V, +5V), Single +5V, 12-Bit DAS with 8+4 Bus Interface |
| MAX197BCAI | Multi-Range (【10V, 【5V, +10V, +5V), Single +5V, 12-Bit DAS with 8+4 Bus Interface |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1978ETM+ | 功能描述:电压模式 PWM 控制器 Integrated Temp Ctlr for Peltier Modules RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX1978ETM+T | 功能描述:电压模式 PWM 控制器 Integrated Temp Ctlr for Peltier Modules RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX1978ETM-T | 功能描述:电压模式 PWM 控制器 RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX1978EVKIT | 功能描述:电源管理IC开发工具 MAX1978 EVAL KIT RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX19790ETX/GH9 | 功能描述:有源衰减器 RoHS:否 制造商:TriQuint Semiconductor 通道数量: 最大频率: 阻抗: 最大 VSWR: 位数: 最大工作温度: 最小工作温度: |
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