UC3842 Does Not Work When Driving BOOST

BOOST
Hello, I just came into contact with UC3842, and I set up the BOOST circuit, as shown above, input 26V, ideal output 50V, load 8 ohms. The output of UC3842 is only 100mv, and it is normal for the Vref voltage to be 5V. Is it that the chip itself is not suitable for circuits of this power?
Hope for good suggestions.
Thanks!

I don’t think this forum can be of much help for you, as it’s focused on learning to code and programming languages. Maybe you will have more luck in a different forum.