OPA541AM

The internal current limit of the OPA541 device can be programmed by using a single external resistor, RCL. The current limit is activated when the voltage across this resistor is approximately a base-emitter turn-on voltage. The value of the current limit resistor is calculated by Equation 1. The actual current limit depends on whether the current is positive or negative, with a 10% deviation from the expected level. The current limit value decreases with increasing temperature and increases at low temperatures. The OPA541 uses a single current-limit resistor to set both the positive and negative current limits, ensuring protection for the amplifier and load from fault conditions.

The OPA541 operational amplifier is available in two types of packages: an 11-pin power plastic package and an industry-standard 8-pin TO-3 hermetic package. The power plastic package features a copper-lead frame for efficient heat transfer, while the TO-3 package is isolated from all circuitry, allowing direct mounting to a heat sink without special insulators. The key features of the OPA541 include power supplies up to ±40V, output current up to 10A peak, programmable current limit up to 5A, an industry-standard pinout, FET input, and low-cost power plastic packages. The device uses a single current-limit resistor to set both positive and negative current limits, simplifying the design process for applications such as motor drivers, servo amplifiers, synchro excitation, audio amplifiers, and programmable power supplies.

The OPA541 high-power monolithic operational amplifier can deliver continuous output currents up to 5A.