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 Description

This circuit implements an improved Howland current pump (IHCP) to drive a NMOS type transistor. This is a voltage controlled high current source, capable of delivering 600mA at 1kHz with negligible distortion. A digital to analog converter (DAC) can be used to create the voltage input signal. This circuit is designed to be operated at a single supply of 85V.

Improved Howland Current Pump with Discrete Output Current Boost CircuitImproved Howland Current Pump with Discrete Output Current Boost Circuit