My application does not use the current limit of the device and therefore I would like to know if I am to leave the current sense pin open or tie directly to the output with no Rcl in between or something else. Please confirm and provide the reason for the methodology.
Thank you,
HSG
Hello HSG,
If you elect not to use the OPA541 current sense function the Isense pin should be connected to the Output Drive pin. You can see from the OPA541 datasheet Figure 7 that shorting them together is the equivalent of RCL equal to 0 Ohms, and maximum output current capability results. In that case, the current limit function is disabled.
Leaving the Isense pin open lets the emitters of the current limit transistors float. Operation of the OPA541 under that condition has not been characterized.
Regards, Thomas
Precision Amplifiers Applications Engineering
