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參數(shù)資料
| 型號： | MAX1978ETM |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | Integrated Temperature Controllers for Peltier Modules |
| 中文描述： | DIGITAL TEMP SENSOR-SERIAL, 1Cel, SQUARE, SURFACE MOUNT |
| 封裝： | EXPOSED PAD, TQFP-48 |
| 文件頁數(shù)： | 16/20頁 |
| 文件大?。?/td> | 620K |
| 代理商： | MAX1978ETM |
M
The MAX1979 controls the TEC current in only one
direction (unipolar). Set the maximum unipolar TEC cur-
rent by applying a voltage to MAXIP. Connect MAXIN to
GND when using the MAX1979. The equation for set-
ting MAXIP is the same for the MAX1978 and
MAX1979. Do not exceed the positive or negative cur-
rent-limit specifications on the TEC. Refer to the TEC
manufacturer
’
s data sheet for these limits.
Setting Max TEC Voltage
Apply a voltage to MAXV to control the maximum differ-
ential TEC voltage. MAXV can vary from 0 to REF. The
voltage across the TEC is four times V
MAXV
and can be
positive or negative.
|V
OS1
- V
OS2
| = 4
V
MAXV
Use resistors from 10k
to 100k
to form a voltage-
divider to set V
MAXV
.
Thermal-Control Loop
The MAX1978/MAX1979 provide all the necessary
amplifiers needed to create a thermal-control loop.
Typically, the chopper-stabilized instrumentation ampli-
fier generates an error signal and the integrator amplifi-
er is used to create a PID controller. Figure 4 shows an
example of a simple PID implementation. The error sig-
nal needed to control the loop is generated from the
difference between the set point and the thermistor
voltage. The desired set-point voltage can be derived
from a potentiometer, DAC, or other voltage source.
Figure 5 details the required connections. Connect the
output of the PID controller to CTLI. For details, see the
Applications Information
section.
Control Inputs/Outputs
TEC Current Control
The voltage at CTLI directly sets the TEC current. CTLI
typically is driven from the output of a temperature-con-
trol circuit C
INTOUT
. For the purposes of the following
equations, it is assumed that positive TEC current is
heating.
The transfer function relating current through the TEC
(I
TEC
) and V
CTLI
is given by:
I
TEC
= (V
CTLI
- V
REF
) / (10
R
SENSE
)
where V
REF
is 1.50V
and I
TEC
= (V
OS1
- V
CS
) / R
SENSE
V
CTLI
is centered around REF (1.50V). I
TEC
is zero when
V
CTLI
= 1.50V. When V
CTLI
> 1.50V, the MAX1978 is heat-
ing. Current flow is from OS2 to OS1. The voltages are:
V
OS2
> V
OS1
> V
CS
when V
CTLI
< 1.50V, current flows from OS1 to OS2:
V
OS2
< V
OS1
< V
CS
Integrated Temperature
Controllers for Peltier Modules
16
______________________________________________________________________________________
C3
C2
C1
R3
R2
DIFOUT
INTOUT
REF
INT-
R1
Figure 4. Proportional Integral Derivative Controller
MAX1978
MAX1979
FB-
REF
FB+
C
REF
V
SETPOINT
V
THERMISTOR
MAX1978
MAX1979
FB-
REF
FB+
C
REF
V
SETPOINT
V
THERMISTOR
DAC
DIGITAL
INPUT
Figure 5. The Set Point can be Derived from a Potentiometer
or a DAC
相關(guān)PDF資料 |
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 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1978ETM+ | 功能描述:電壓模式 PWM 控制器 Integrated Temp Ctlr for Peltier Modules RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| MAX1978ETM+T | 功能描述:電壓模式 PWM 控制器 Integrated Temp Ctlr for Peltier Modules RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| MAX1978ETM-T | 功能描述:電壓模式 PWM 控制器 RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| MAX1978EVKIT | 功能描述:電源管理IC開發(fā)工具 MAX1978 EVAL KIT RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| MAX19790ETX/GH9 | 功能描述:有源衰減器 RoHS:否 制造商:TriQuint Semiconductor 通道數(shù)量: 最大頻率: 阻抗: 最大 VSWR: 位數(shù): 最大工作溫度: 最小工作溫度: |
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