OPA541: PSpice Model for Altium 18.1.9 with Current Limit

Tim Herbison

Prodigy 145 points

Part Number: OPA541
Other Parts Discussed in Thread: TL054

Please modify the following model so I can simulate the current limit functionality.

The following model from shows the current limit pin not connected nor modeled in any manner.

Preferable an updated library for "BB Operational Amplifier.IntLib" would be most appreciated.

* OPA541 OPERATIONAL AMPLIFIER "MACROMODEL" SUBCIRCUIT

* CREATED USING PARTS RELEASE 4.03 ON 10/15/90 AT 14:05

* REV.A

* ------------------------------------------------------------------------

* | NOTICE: THE INFORMATION PROVIDED HEREIN IS BELIEVED TO BE RELIABLE; |

* | HOWEVER; BURR-BROWN ASSUMES NO RESPONSIBILITY FOR INACCURACIES OR |

* | OMISSIONS. BURR-BROWN ASSUMES NO RESPONSIBILITY FOR THE USE OF THIS |

* | INFORMATION, AND ALL USE OF SUCH INFORMATION SHALL BE ENTIRELY AT |

* | THE USER'S OWN RISK. NO PATENT RIGHTS OR LICENSES TO ANY OF THE |

* | CIRCUITS DESCRIBED HEREIN ARE IMPLIED OR GRANTED TO ANY THIRD PARTY. |

* | BURR-BROWN DOES NOT AUTHORIZE OR WARRANT ANY BURR-BROWN PRODUCT FOR |

* | USE IN LIFE-SUPPORT DEVICES AND/OR SYSTEMS. |

* ------------------------------------------------------------------------

* CONNECTIONS: NON-INVERTING INPUT

* | INVERTING INPUT

* | | POSITIVE POWER SUPPLY

* | | | NEGATIVE POWER SUPPLY

* | | | | OUTPUT

* | | | | |

.SUBCKT OPA541 1 2 3 4 5

C1 11 12 10.71E-12

C2 6 7 15.00E-12

DC 5 53 DX

DE 54 5 DX

DLP 90 91 DX

DLN 92 90 DX

DP 4 3 DX

EGND 99 0 POLY(2) (3,0) (4,0) 0 .5 .5

FB 7 99 POLY(5) VB VC VE VLP VLN 0 2.653E9 -3E9 3E9 3E9 -3E9

GA 6 0 11 12 150.8E-6

GCM 0 6 10 99 337.6E-12

ISS 3 10 DC 120.0E-6

HLIM 90 0 VLIM 1K

J1 11 2 10 JX

J2 12 1 10 JX

R2 6 9 100.0E3

RD1 4 11 6.631E3

RD2 4 12 6.631E3

RO1 8 5 .25

RO2 7 99 .25

RP 3 4 4.000E3

RSS 10 99 1.667E6

VB 9 0 DC 0

VC 3 53 DC 5

VE 54 4 DC 5

VLIM 7 8 DC 0

VLP 91 0 DC 14.00E3

VLN 0 92 DC 14.00E3

.MODEL DX D(IS=800.0E-18)

.MODEL JX PJF(IS=2.000E-12 BETA=94.75E-6 VTO=-1)

.ENDS

over 6 years ago

0 Thomas Kuehl over 6 years ago

TI__Guru* 93105 points

Hi Tim,

The OPA541 is a legacy product and its simulation model has a very limited list of parameters that are modeled, which as you are aware doesn't include the current limit function. The current model design is very simplistic compared to today's model designs and doesn't facilitate its inclusion. A complete ground and up redesign would be required. We are currently rebuilding most of our older op amp simulation models and the queue is set based on product demand. Unfortunately, the OPA541 is not high in the queue and is not scheduled to be rebuilt anytime soon.

Regards, Thomas
Precision Amplifiers Applications Engineering

0 Tim Herbison over 6 years ago in reply to Thomas Kuehl

Prodigy 145 points

Thank you Thomas for your frank reply.
Would inclusion of a simple state limiter in the output provide a functional analysis?

0 Alex Davis over 6 years ago in reply to Tim Herbison

TI__Expert 7500 points

Hi Tim,
For a functional analysis, consider changing the values for VLN and VLP from 14.00E3 to your desired level. These correspond to the negative and positive current limit levels in mA. This should give you a rough approximation of the current limit behavior, though as Tom mentions above, the OPA541 simulation model uses an older architecture which may not be as comprehensive as our newer models.

0 Tim Herbison over 6 years ago in reply to Alex Davis

Prodigy 145 points

Can I bug you for one more thing?

Attempting to modify the model ....

Please provide a schematic of the pspice model posted.

OPA541 OPERATIONAL AMPLIFIER "MACROMODEL" SUBCIRCUIT