LAB techniuque to avoid higher current then possible

[john23]

Hello,I have build a circuit which intend to use as a driver for PMA5-83-2W+.
My main concern   is the driver putting more current then the port can handle.
For example in my circuit shown in the attached photo I have TL431 which can output much more then 4mA.
So In the worst scenario my circuit will see 100Ohm instead of 555Ohm and I will get much higher current flowing into the Vg1 port and damaging it.
Is there a way to handle it in the lab?
Thanks.

LTSPICE file are attached.

https://www.minicircuits.com/pdfs/PMA5-83-2W+.pdf

[NiHaoMike]

I'm not understanding the problem, the TL431 cannot supply any current, it can only sink it. The current supply is from the opamp which is limited by the resistor.