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| 型号： | ADN8831ACPZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 16/20页 |
| 文件大小： | 0K |
| 描述： | IC THERMO COOLER CTRLR 32LFCSP |
| 产品变化通告： | ADN8831 Product Redesign & Datasheet Change |
| 标准包装： | 1 |
| 应用： | 热电冷却器 |
| 电流 - 电源： | 8mA |
| 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： | 32-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 32-LFCSP-VQ |
| 包装： | 标准包装 |
| 产品目录页面： | 789 (CN2011-ZH PDF) |
| 配用： | ADN8831-EVALZ-ND - BOARD EVAL FOR ADN8831 |
| 其它名称： | ADN8831ACPZ-REEL7DKR |
ADN8831
Data Sheet
2.5
f 0 dB ?
1
2 ? R3C1
? 80 ? TECGAIN
2.0
1.5
1.0
To ensure stability, the unity-gain crossover frequency is to be
lower than the thermal time constant of the TEC and thermistor.
However, this thermal time constant is sometimes unspecified
making it difficult to characterize. There are many texts written
on loop stabilization, and it is beyond the scope of this data
sheet to discuss all methods and trade offs in optimizing
compensation networks.
0.5
ADN8831
0
–15
5
25
45
65
CHOP2
TEMPERATURE(°C)
Figure 18. V OUT1 vs. Temperature
4
OUT1
5
IN2P
6
IN2N
7
OUT2
PID COMPENSATION AMPLIFIER (Chop2)
Use the Chop2 amplifier as the PID compensation amplifier.
V TEMPSET
The voltage at OUT1 feeds into the PID compensation amplifier.
R3
R1
C1
The frequency response of the PID compensation amplifier is
dictated by the compensation network. Apply the temperature
R2
C2
CF
set voltage at IN2P. In Figure 17, the voltage at OUT2 is calcu-
lated using the following equation:
Figure 19. Implementing a PID Compensation Loop
V OUT2 ? V TEMPSET ?
Z2
Z1
( V OUT1 ? V TEMPSET )
The user sets the exact compensation network. This network
varies from a simple integrator to PI, PID, or any other type of
network. The user also determines the type of compensation
and component values because they are dependent on the thermal
response of the object and the TEC. One method for empirically
determining these values is to input a step function to IN2P,
therefore changing the target temperature, and adjusting the
compensation network to minimize the settling time of the TEC
temperature.
0dB
R1
R2 || R3
R1
R3
A typical compensation network for temperature control of
1
2 π R3C1
1
2 π R1C1
1
2 π C2 (R2 + R3)
1
2 π R3C2
a laser module is a PID loop consisting of a very low frequency
shows a simple network for implementing PID compensation.
To reduce the noise sensitivity of the control loop, an additional
pole is added at a higher frequency than the zeros. The bode
plot of the magnitude is shown in Figure 20. The unity-gain
FREQUENCY (Hz Log Scale)
Figure 20. Bode Plot for PID Compensation
With an ADN8831 -EVALZ board, AN-695, an application note
shows how to determine the PID network components for a
stable TEC subsystem performance.
crossover frequency of the feedforward amplifier is calculated
using the following equation:
Rev. A | Page 16 of 20
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| ADN8833ACBZ-R7 | 功能描述:IC THERMO COOLER DRIVER 25WLCSP 制造商:analog devices inc. 系列:* 零件状态:在售 标准包装:1 |
| ADN8833ACPZ-R2 | 功能描述:IC THERMO COOLER DRIVER 24LFCSP 制造商:analog devices inc. 系列:- 包装:剪切带（CT） 零件状态:在售 应用:热电冷却器 电流 - 电源:2.1mA 电压 - 电源:2.7 V ~ 5.5 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:24-WFQFN 裸露焊盘，CSP 供应商器件封装:24-LFCSP-WQ（4x4） 标准包装:1 |
| ADN8833ACPZ-R7 | 功能描述:IC THERMO COOLER DRIVER 24LFCSP 制造商:analog devices inc. 系列:- 包装:剪切带（CT） 零件状态:在售 应用:热电冷却器 电流 - 电源:2.1mA 电压 - 电源:2.7 V ~ 5.5 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:24-WFQFN 裸露焊盘，CSP 供应商器件封装:24-LFCSP-WQ（4x4） 标准包装:1 |
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