Part Number:OPA541
Tool/software:TINA-TI or Spice Models
I want to supply up to 7 Amps to some coils and thought the OPA541 would be a good choice. Using the basic configuration shown in TINA-TI example sbom719.tsc (but with a 0.1 Ohm resistor from Vout to Vrcl), I can get the 7 Amps, but the current-limiting resistor gets so hot its resistance value changes and the current quickly drops down to about 5.5 Amps. I thought I might try it configured as a Howland current source, and the TINA model shows it working, but in practice it doesn't seem to work. Can anybody help me with this? Thanks, Harry.