SBOU268 November 2021 OPA593
The OPA593EVM is powered from a 10-V to 85-V single supply, or ±5-V to ±42.5-V dual supply. The external power supply used to power the EVM must be capable of supplying the total anticipated current required by the particular OPA593 circuit configuration and the load. The OPA593 can supply a dc or peak output current approaching ±300 mA. Use a power supply capable of providing at least 2x the anticipated continuous current to account for peak-current conditions. Make sure any cables used with the EVM are rated to carry the high current, and sustain voltages of 100 V or more.
The input to the EVM can be a dc source, an ac signal source such as signal generator, or the actual signal derived from a sensor or transducer. A jumper shunt can be placed across JP10 that connects a 49.9-Ω, 2-W termination resistor from the VIN+ input (J9) input to ground. This internal resistor provides a handy input instrument termination impedance very close to 50 Ω.
Other resistors on the EVM that may have to dissipate high power are laid out with the wide 2512, 2-W footprint. If the EVM is set up to use different, higher-resistance resistors, the 2-W resistors can be desoldered and removed. A 0805 footprint is incorporated within each of the larger wide 2512 resistor board patterns. These are in addition to the other 0805 footprints available for use as input and feedback resistors.
Output signals derived from the EVM can be monitored by whatever means available to the user. Often, an oscilloscope with a 10x probe provides a good way to observe the output waveform from the OPA593 output (VOUT). The output signal VOUT is connected to the J11 BNC connector that is intended for the instrument connection. Additionally, VOUT is brought to high-voltage terminal block J12. The block may be used to connect the output load to the OPA593 output. The load may be a resistor, motor, actuator, power transducer, or an active load.
Some OPA593 output loads dissipate moderate power and some may be physically large. In this case, the load can be located external to the EVM PCB.