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Load Response of LDC501 TEC Controllers
                                                                                                 Rev B. Revised Oct 2012
     
     
     
     
     
     
     




                                                                                                            
     
                                     Figure 1    Thermal load response test setup 

     

     

    An important property of a TEC controller is its              Tests were done to show the TEC's response to 
dynamic  response  to  a  thermal  load  change.  For         thermal  load  changes.  Figure  1  shows  the  test 
example,  when  the  laser  current  changes,  the            setup.  
heating  capability  changes,  which  in  turn  causes             
temperature  to  change.  The  TEC  controller  will              A 10 resistor is located on a TEC cooled metal 
sense  this  change  and  make  a  correction  to  bring      plate.  A  current  change  in  the  10  resistor  will 
temperature back to the set value.                            cause  a  thermal  load  change.  A  NTC  thermistor 
                                                              (MC65F103C)  is  used  in  the  control  loop.  This 
    The  Stanford  Research  Systems'  LDC500,                thermister has a 10k resistance at 25C. 
LDC501  and  LDC502  controllers  have  an  Auto                   
tuning  capability  to  find  PID  parameters  which              The  LDC501  was  set  to  25.000

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