I am using the OPA2673 as a buffer to drive a large capacitor (10nF) at high speed (100ns). The peak charging current is 600mW but the peak power is about 5W for 10ns. can I exceed the amplifiers power specs for low duty factor pulses?
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I am using the OPA2673 as a buffer to drive a large capacitor (10nF) at high speed (100ns). The peak charging current is 600mW but the peak power is about 5W for 10ns. can I exceed the amplifiers power specs for low duty factor pulses?
Rohit,
Thanks for your reply. The opamp is nun at low average power levels so the junction temperatures would be well below operating limits (<80C). The data set does not give any time dependent information e.g. thermal time constants. Is it ok to assume that the thermal time constants are much greater than 1us? If that is the case the temperature rise during each pulse will be small and there will be time for the junction to cool down between pulses. Thats why I think it will be ok to exceed the internal 2W power dissipation limit for short times ~20 ns. However I am not very confident my assumptions are correct so any further insight would be welcome.
Paul