I have a DC-DC buck boost converter (TPS55288) that I was planning on using for a project. I'm making a revision to my current heated gloves, and my circuit needs to be as small as possible since the electronics will be stored inside the gloves themselves.
I need the converter to heat up a 5 ohm heating element with a output voltage ranging from 5V to 8V, an input voltage ranging from 8.4V to 6V, with a switching frequency of 750KHz.
I was going to use a 4.7uH inductor, but I noticed that my board got uncomfortably hot (around 60 degrees C probably, I didn't measure it) when running it at a 5V output. When I changed to a 1uH inductor, the board was a lot cooler (probably around 40 degrees C.) With this in mind, I was thinking of using the 1uH inductor for the sake of thermals.
So I wanted to ask: Why does a lower inductance value generate less heat on my PCB? What are the positive and negative effects of having a lower inductor size with a large current ripple on a static load?