• State
  • Locked Locked
  • Replies 3 replies
  • Subscribers 48 subscribers
  • Views 689 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

OPA4277: the opamp reaches very high temperatures

yelsing torres
Intellectual 340 points
Part Number: OPA4277
Other Parts Discussed in Thread: OPA4227

hello.

I'm using the operational opa2477. I am using it within a circuit to adjust the gain of a signal. The amplifier gets very hot, so I remove all the components that connect it with the other parts of the circuit. In conclusion the amplifier is only connected to the + -12V supply, and its respective decoupling capacitors, but the amplifier still reaches temperatures of 60 ° C and above. Is this temperature normal for the amplifier? I have changed the amplifier twice, and the result remains the same.
the funny thing is that the amplifier works, and fulfills its task, but I do not know if I let the circuit work with this temperature, in a short time, the circuit no longer works.

  • 0
    Intellectual 340 points
    I have had an error and the operational one is not the opa4277, it is the opa4227. The opa4227 has a Quiescent Current very high, but even so it is normal to reach high temperatures? or is a heatsink necessary?
  • 0 in reply to yelsing torres
    TI__Expert 5830 points
    Hello Yelsing,

    Could you please send a schematic as well as the type of waveform, signal amplitude, and signal frequency? This will help with us in analyzing what is causing the issue.

    Best regards,

    Errol Leon
    Texas Instruments
    Precision Op Amp Applications
  • 0 in reply to Errol Leon6
    Intellectual 340 points

    Hello errol

    I attach the schematic. the amplifier that is heated is the U6. When the circuit works, the amplifier reaches close to 80 ° c. I have removed the connections of this amplifier, to know how much it heats without load. I removed R26, R25, R54, R55, R56, R59, R33, R34, R35, R60, R47, R50, R49, R51, R48, C63, C64. Without these resistances, the amplifier reaches 65 ° C (only power). I have removed the amplifier from the board, and I have connected it directly to a power source, but it continues at 65 ° C. The current consumption of the opa4227, with only the power supply connected is 15 mA, close to the quiescent Current value of the datasheet. The ambient temperature is less than 20 ° C.placa pid y bias.pdf