SelVCD™ Isolated Gate Drivers

I'm Asa Kirby, and I'm an engineering manager with Skyworks. Today, I'm gonna talk to you about SelVCD™, our selectable variable current drive isolated gate drivers, and the role they play in powering the AI data center.

Consider how often you have used an AI chatbot. Every prompt you send uses about the same energy as running a microwave for one second. Now, multiply that by billions of prompts a day. That is an enormous amount of power and is why AI is rewriting the physics of the data center.

As demand scales from megawatts toward gigawatts, every layer from the utility grid to the AI rack has to be rearchitected to bring more power in and convert it more efficiently. This is pushing the industry toward higher voltage distribution, up to 800 volts DC. And at these voltages, you need isolation, moving power and data safely between a low voltage domain and a high voltage domain. Every fraction of efficiency and density matters right down to the individual chip.

Here's the challenge. AI densitters have highly dynamic spiky power demand, and traditional power supplies are designed for peak load, so efficiency goes untapped during normal operation. SelVCD™ technology changes this. Instead of driving the power switch with a fixed voltage and an external resistor, SelVCD™ uses adjustable current sources, so switching speed can be tuned in real time, and the Miller clamp can be built into the chip, raising efficiency and system density at once.

This is SelVCD™, selectable variable current drive, built into Skyworks' latest series of isolated gate drivers. The first thing you'll notice is how it switches. Instead of the usual voltage mode pull up and pull down with an external gate resistor, SelVCD™ charges and discharges the switch's gate with controlled current sources. The source and sync currents are independently selectable across eight levels, so the driver can optimize switching for changing bus voltage and load current and temperature.

On the display, you can watch the waveform adjust the switching speed live.

Earlier gate drivers lock that speed. SelVCD™ tunes it on the fly. That same flexibility extends to safety. The Miller clamp is a critical safety feature.

Think of it as a doorstop in a windy room. It keeps the door, the power switch shut, which it is supposed to be off. If that switch turns on when it shouldn't, what we call parasitic turn on, the result could be catastrophic. Shoot through, fire, even an explosion.

We definitely don't wanna be the reason a data center goes offline. Wide band gap devices like silicon carbide and gallium nitride are especially vulnerable because they turn on at a low threshold. SelVCD™ clamp enables automatically when the output falls to about two volts above ground and drives the gate down with full pull down current. Because it is integrated, it removes the negative gate drive rail and its external components, cutting the bill of materials and freeing board space.

We deliver both the dynamic drive and the integrated Miller clamp in a dual channel package. Integrated Miller clamps are usually offered only on single channel drivers. So doing it in a dual channel is what lets customers increase system density without giving up the safety feature. It remains unmatched in the market.

Here's how that stacks up against a traditional approach. Traditional voltage mode gate drivers force a trade off. To avoid parasitic turn on, they must either slow the switching down, which leaves efficiency on the table, add a negative gate drive rail, which adds components, complexity, and body diode losses, or bolts on an external mill clamp, which costs board area and impacts reliability. In testing, with a 1,200 volt silicon carbide device, the traditional driver could eventually be pushed into parasitic turn on at aggressive slew rates while a driver equipped with SelVCD™ held the gate safely below its turn on threshold even at the most extreme conditions with no negative rail and no external clamp.

For customers, that translates directly to the bottom line. You can drive wide band gap devices aggressively for maximum efficiency and still stay safe without the negative bias rail, the extra components, or the board space they consume. This means lower BOM costs, higher power density, and better efficiency in the same footprint, which is exactly what AI data center power supplies need as density climbs.

SelVCD™ isolated gate drivers deliver real time tunable switching, an integrated miller clamp, and dual channel density, cutting BOM cost and board area while lifting overall efficiency.

Whether you're designing next generation power or server racks in AI data centers or you need to drive wide band gap devices at full efficiency without compromising safety, Skyworks' SelVCD™ technology helps enable the ultra efficient, high density power supplies the AI era demands. Skyworks brings decades of safety rated isolation and power density expertise to this transformation, from the utility grid to the AI rack.

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