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Possibility of using OPA 567 or OPA 569

Andrei Oleinik
Prodigy 20 points
Other Parts Discussed in Thread: OPA567, OPA569, OPA564, OPA547
I am using the arbitrary waveform  generator  for supply Peltier module (thermoelectric heater\cooler). 
Typical parameters of supplying signal are:
- sine wave form
- voltage up to 10 V
- current up to 0.2 A
- frequency up to 0.1 Hz (most often about 0.005-0.05 Hz).
However, maximal power from the waveform generator is small for needed purpose and I would like to gain power of signal from the generator (precisely speaking, it is necessary to increase current, since voltage has already reached its limit for the used  Peltier module.
As far I understand, operational amplifiers OPA 567 and OPA 569 can be used for thermoelectric devices.
But I would like to consult - could these amps gain power at preservation of mentioned above parameters of signal?
 
 
 
  • 0
    TI__Guru* 93105 points

    Hello Andrei,

    Power operational amplifiers are commonly employed in TEC driver applications. A properly specified power op amp should provide very good performance in that type of application.

    You mention a requirement for a voltage up to 10 V which I assume is the output voltage swing that is needed. Both the OPA567 and OPA569 are specified with a maximum operating voltage of +5.5 V, and wouldn't be able to support the 10 V output swing requirement. In order to swing the 10 V the power op amp would have to be powered by a supply greater than 10 V, and be capable of delivering the 10 V output swing at the required output current level.

    Two power op amps that I think will cover your TEC application nicely are the OPA547 (0.5 Amp) and OPA564 (1.5 Amp). Both can deliver more than 200 mA, and having the higher output current capability allows their output to swing closer to the supply rails. You can find more information about the OPA547 and OPA564 in their datasheets found here:

     

    TEC applications often use a bridge-tied load configuration as seen in the OPA567 datasheet Figure 14, or OPA569 datasheet Figure 20. Two OPA547 or OPA564 power op amps could be connected in the bridge-tied load circuit as well.

    Regards, Thomas

    Precision Amplifiers Applications Engineering

  • 0 in reply to Thomas Kuehl
    Prodigy 20 points

    Dear Thomas,

    Many thanks for your advice!