SBOA643 October   2026 OPA591 , OPA596

 

  1.   1
  2.   Design Goals
  3.   Design Description
  4.   Design Notes
  5.   Design Steps
  6.   Design Simulation Results
  7.   Design Measured Results
  8.   Target Applications
  9.   Design Featured Device
  10.   Design Alternative Device
  11.   Design References
  12. 1Additional Resources
  13.   Trademarks

Design Measured Results

See below for oscilloscope results for the circuit.
Input Output
VIN BW Gain VLOAD ILOAD
0VP - 5VP

1kHz

 1.2V/V 60VP 600mA
OPA591 DC Sweep Measured Results (Vin = 5VP @ 1 kHz) OPA591 DC Sweep Measured Results (Vin = 5VP @ 1 kHz).

A square wavefrom 0-5VP is applied to the circuit. The OPA591 DC Sweep Measured Results above shows the relationship between VIN, VOUT, and IOUT, verifying the Improved Howland Current Pump and Discrete Output Boost circuit is behaving as expected.

Input Output
VIN VS VLOAD ILOAD
0 VP - 3.5VP 60V 37.4 VP 0mA - 384mA

Since a DC signal has a higher power equivalence for the same input voltage, the voltage supply of the circuit is decreased to 60V. A DC sweep from 0 - 3.5VP is applied to the circuit. The figure below shows the linear behavior between VIN and IOUT, verifying the Improved Howland Current Pump and Discrete Output Boost circuit is behaving as expected. The line of best fit is included, showing small deviation from the expected values. At 3.5VP, the output current deviates from the expected value. This is due to the high power dissipation of the circuit. As the MOSFET temperature increases, the output becomes less linear.

VIN vs. IOUT : DC Sweep Measured Results VIN vs. IOUT : DC Sweep Measured Results.