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参数资料
| 型号： | MAX1979ETM |
| 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： | 16/20页 |
| 文件大小： | 620K |
| 代理商： | MAX1979ETM |
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
相关PDF资料 |
PDF描述 |
|---|---|
| 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 |
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| MAX197BCAI | Multi-Range (【10V, 【5V, +10V, +5V), Single +5V, 12-Bit DAS with 8+4 Bus Interface |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1979ETM+ | 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 |
| MAX1979ETM+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 |
| MAX1979ETM-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 |
| MAX197ACAI | 功能描述:模数转换器 - ADC Integrated Circuits (ICs) RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX197ACAI+ | 功能描述:模数转换器 - ADC 12-Bit 8Ch 100ksps 4.18V Precision ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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