TVS diode macro model problem

Jib Jaja

Hi TI,

I have downloaded a bidirectional TVS diode spice model on a supplier website. I want to create a macro model on TINA SW of this TVS diode by importing the code within TINA.2677.TVS schematics.TSC

In the netlist tool, I compile this model with no error. So I create a macro model on TINA and insert it on a schematics.

When I try to test if this TVS diode clamps voltage to its Vbr value (e.g. close to 9V for my model) by injecting a sinus wave of 50V amplitude, the diode is never in reverse mode. I have attached a shematics with the model.

Could you tell where is the issue ? Why my TVS diode never clamps to its Vbr value ? If I put an internal resistance to sinus wave, there is a clamp observed on TVS diode output but I don' t know if it is at Vbr value of the model.

Is there a problem at co2022.TVS schematics.TSCde level (syntaxe) or at schematics level (stimulus) ?

Thx for your help.

jaja

over 10 years ago

0 Britt Brooks - Online Design Tools over 10 years ago

TI__Mastermind 41310 points

Jaja,

Please contact the vendor that provided the model for more information as to how it works. It appears to be two diodes and a resistor, but the resistor is connected across the model terminals, so it is behaving like a resistor.

Britt

0 Suresh Chattu over 10 years ago

TI__Prodigy 220 points

Hi Jaja,

The simulation setup might be wrong, you are measuring voltage across a ideal voltage source, so you are seeing applied voltage. I just added a 1 ohm resistor in series ( source resistance ) with the power supply, it seems to be clamping fine. PFA the TINA schematic.

Hope this helps

7571.TVS_schematic.TSC

Thanks & Regards

Suresh

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TVS diode macro model problem