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MAX1979

更新时间： 2024-09-24 23:45:55
品牌 Logo 应用领域
美信 - MAXIM 控制器
页数 文件大小 规格书
20页 618K
描述
Integrated Temperature Controllers for Peltier Modules

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MAX1979 数据手册

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19-2490; Rev 0; 7/02  
Integrated Temperature  
Controllers for Peltier Modules  
General Description  
Features  
The MAX1978/MAX1979 are the smallest, safest, most  
accurate complete single-chip temperature controllers for  
Peltier thermoelectric cooler (TEC) modules. On-chip power  
FETs and thermal control-loop circuitry minimize external  
components while maintaining high efficiency. Selectable  
500kHz/1MHz switching frequency and a unique ripple-can-  
cellation scheme optimize component size and efficiency  
while reducing noise. Switching speeds of internal  
MOSFETs are optimized to reduce noise and EMI. An ultra-  
low-drift chopper amplifier maintains ±0.001ꢀC temperature  
stability. Output current, rather than voltage, is directly con-  
trolled to eliminate current surges. Individual heating and  
cooling current and voltage limits provide the highest level of  
TEC protection.  
o Smallest, Safest, Most Accurate Complete  
Single-Chip Controller  
o On-Chip Power MOSFETS—No External FETs  
2
o Circuit Footprint < 0.93in  
o Circuit Height < 3mm  
o Temperature Stability to 0.001°C  
o Integrated Precision Integrator and Chopper  
Stabilized Op Amps  
o Accurate, Independent Heating and Cooling  
Current Limits  
o Eliminates Surges By Directly Controlling  
TEC Current  
The MAX1978 operates from a single supply and provides  
bipolar ±±A output by biasing the TEC between the outputs  
of two synchronous buck regulators. True bipolar operation  
controls temperature without “dead zones” or other nonlin-  
earities at low load currents. The control system does not  
hunt when the set point is very close to the natural operating  
point, where only a small amount of heating or cooling is  
needed. An analog control signal precisely sets the TEC  
current. The MAX1979 provides unipolar output up to 6A.  
o Adjustable Differential TEC Voltage Limit  
o Low-Ripple and Low-Noise Design  
o TEC Current Monitor  
o Temperature Monitor  
o Over- and Undertemperature Alarm  
o Bipolar 3A Output Current ꢀMAꢁ19ꢂ78  
o Unipolar +6A Output Current ꢀMAꢁ19ꢂ98  
A chopper-stabilized instrumentation amplifier and a high-  
precision integrator amplifier are supplied to create a pro-  
portional-integral (PI) or proportional-integral-derivative (PID)  
controller. The instrumentation amplifier can interface to an  
external NTC or PTC thermistor, thermocouple, or semicon-  
ductor temperature sensor. Analog outputs are provided to  
monitor TEC temperature and current. In addition, separate  
overtemperature and undertemperature outputs indicate  
when the TEC temperature is out of range. An on-chip volt-  
age reference provides bias for a thermistor bridge.  
Ordering Information  
PART  
TEMP RANGE  
-40°C to +85°C  
-40°C to +85°C  
PIN-PACKAGE  
48 Thin QFN-EP*  
48 Thin QFN-EP  
MAX1978ETM  
MAX1979ETM  
*EP = Exposed pad.  
Pin Configuration  
TOP VIEW  
The MAX1978/MAX1979 are available in a low-profile  
48-lead thin QFN-EP package and is specified over the  
-40ꢀC to +85ꢀC temperature range. The thermally  
enhanced QFN-EP package with exposed metal pad  
minimizes operating junction temperature. An evaluation  
kit is available to speed designs.  
36  
OS2  
N.C.  
1
2
FREQ  
35  
34  
33  
32  
31  
30  
29  
28  
27  
26  
25  
N.C.  
PGND2  
LX2  
3
PGND1  
LX1  
4
PGND2  
LX2  
5
PGND1  
LX1  
6
MAX1978  
MAX1979  
Applications  
PV  
2
DD  
7
PV  
1
DD  
N.C.  
LX1  
N.C.  
LX2  
8
Fiber Optic Laser Modules  
9
PV  
2
DD  
10  
PV  
DD  
1
WDM, DWDM Laser-Diode Temperature Control  
Fiber Optic Network Equipment  
EDFA Optical Amplifiers  
GND  
GND  
SHDN 11  
OT 12  
Telecom Fiber Interfaces  
ATE  
QFN-EP  
*ELECTRICALLY CONNECTED TO THE UNDERSIDE METAL SLUG.  
NOTE: GND IS CONNECTED TO THE UNDERSIDE METAL SLUG.  
Typical Operating Circuit appears at end of data sheet.  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at  
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.  
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