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参数资料
| 型号： | MAX1978ETM+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 18/20页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR INT TEMP 48TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 43 |
| 应用： | 热电冷却器 |
| 电源电压： | 3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-WFQFN 裸露焊盘 |
| 供应商设备封装： | 48-TQFN-EP（7x7） |
| 包装： | 管件 |
| 产品目录页面： | 1410 (CN2011-ZH PDF) |
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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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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