Using Arduino and PWM to control LTC3780 Buck/Boost

Hello everybody,

My project seems pretty simple but I've had some problems based on my overall inexperience with electronics and coding. I want to use a 12v/120W induction coil to precisely anneal pieces of brass using a thermocouple and PID for temperature control. I started using this tutorial as a base:

http://electronoobs.com/eng_arduino_tut24.php

And tried using a FET trigger switch module to control the induction coil and it all went up in magic smoke. I found out that the induction coil wants to be fed a variable voltage, not triggered via PWM and a FET. I purchased this product as a way of adjusting the voltage, but I'm unsure of how to properly control it via Arduino.

https://www.amazon.com/JacobsParts-Synchronous-Converter-Step-Down-Efficiency/dp/B078KQ63HZ/ref=sr_1_1?ie=UTF8&qid=1539623124&sr=8-1&keywords=LTC3780

Here's some research I've come across:

http://cds.linear.com/docs/en/datasheet/3780ff.pdf

https://wiki.beyondlogic.org/index.php?title=WD2002SJ_LTC3780_Synchronous_Buck_Boost_Converter_Ebay_Automatic_lifting_pressure

https://www.reddit.com/r/AskElectronics/comments/4nokio/controlling_ltc3780_buckboost_via_arduino/

I understand that there is a voSense pin attached somewhere on the voltage control trim pot that I can apply a voltage to adjust the output of the buck/boost. Firstly I must run it through an RC filter and then potentially a voltage divider in order to make this work, according to the reddit thread.

I need some help designing the RC filter and voltage divider. Also, I'm not sure how to adjust the PID code from the tutorial to work with this buck/boost converter. Any help is greatly appreciated.

Thanks for your time,

Jon

Here's some more info that may be useful:

https://electronics.stackexchange.com/questions/167075/how-to-control-a-buck-boost-converter-circuit-from-a-microcontroller

So it seems my options are to address the sense pin directly or replace the analog potentiometer with a digital one running in ratiometric mode. Any insight is greatly appreciated.