Diotec Semiconductor AG

http://www.diotec.com/

Diotec Cooled The Box

The bridge still set the heat. Thermal issues often look mechanical - until you trace them back to the silicon.

We see it every day:

But capacitor life didn’t improve.

The real source wasn’t ambient. It was rectification.

In most SMPS topologies…

Two junctions conduct per half-cycle.

Their forward voltage (Vf) at operating current and 125 °C sets the system’s base temperature.

No CFD model can undo that.

Bridge loss is simple:

P ≈ 2 × I_avg out × Vf(125 °C) + Ir(125 °C) × Vr.

Those few terms explain more thermal behaviour than most airflow models.

That’s why almost every Diotec bridge is characterised for hot-Vf, leakage, IFSM, and Rth.

So purchasing compares like for like.

And design trusts the numbers that drive temperature.

Start your thermal budget at the bridge.

You’ll finish with smaller heatsinks, steadier caps, and cleaner compliance.

The bridge sets the baseline.