Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [gan]

21 questions
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GaN Vs IGBT performances

I was making some research on GaN and I do not understand why GaN is so reveolutionnary. When I take a look on the following specification RdsOn and Coss (Cds + Cgd), the GaN semiconductor has lower performance than the Si IGBT on RdsOn. About the…
Jess
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Why does SiC have lower Rds(on) than GaN?

It seems that GaN has higher Rds(on) than SiC. The lowest Rds(on) that I found for a 650 V GaN is 25 mΩ @ 25°C. SiC has even lower resistance @ 1200 V like 16 mΩ @ 25°C. Does anyone know the physical reason? Does it mean that GaN can provide better…
Jess
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Can I model a diode with higher than usual junction voltage in LTspice using the "Eg" and "Vj" parameters?

I want to model a GaN transistor and include a diode to simulate its reverse conduction above ~2 V with an adjusted diode using the following model statement: .model revGan D(Vj=2 Eg=3.4) The result is essentially that of a regular Si diode: I…
tobalt
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Limit of resonant converters

I am currently trying to design a converter with GaN technology. The converter needs to regulate a wide range of current and consequently the power goes from ~1kW to ~10kW. I took a look on Texas Instrument and Infineon and it appaers that all their…
Jess
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GaN FET short-circuit protection

From Texas Instruments snoaa15, which is an Application Report about overcurrent protection of GaN FETs, in the first page, you can read the following quote: Traditional approaches using current sense transformer, shunt resistors, or…
Iron Maiden
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Common Source GaN HEMT breakdown

I had recently designed an array of GaN HEMTs to be used as a solid state relay. At low voltages (Vin = 24V) everything was working fine. However, when I bumped up Vin to 70V, after a couple cycles turning the SSR on and off to a 10A CC load, the…
Rahul
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How to implement the design of a bidirectional buck-boost converter?

I need your help in designing a bidirectional buck boost converter with the following requirements: Input voltage: 100V-400V Voltage range: 250V-1.2kV Output current: 40-80A Power dissipation of 24 kW. Switching frequency: 20kHz I did some…
victor_uk
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Power MosFET Gate Driver + ESP32 from Source Voltage?

I'm working on an ultra-efficient fixed output half-bridge DC/DC converter. (Where the input is from variable sources of voltage and current like batteries, solar, wind, and also from fixed sources of voltage/current like ac grid) So I've speced out…
James Hancock
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How suitable are GaN half-bridges for small brushless motor drives (ESCs)?

The drone world uses ESCs (Electronic Speed Controllers) to control brushless DC motors. Typically there are six discrete FETs, a driver IC, and a small MCU to sequence things. Typical currents range from 5-100A at 3-25V. For many of the smaller…
Russell Mirov
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Why is "GaN tech" so revolutionary for wall chargers?

A big selling point of RAVPower wall chargers is that they use "GaN tech." I assume that's gallium nitride but, anyway, my question is: If that's what their chargers use what do most other wall chargers use? Silicon? How do they use it? This…
neubert
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Gallium Nitride SCR/Thyristor?

I have an application that requires switching on a load very fast (1ns or so). There are N-channel / low side GaN MOSFETS. I would really like to switch a load on the high side, which causes problems when the FET output/"source" rises above the gate…
kjav
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Where does the current go in this circuit?

Maybe a stupid question. It's a super simple circuit: 25 V input, a GaN and a 10 Ω load — I didn't include the driving circuit, but I'm switching at 100 kHz. Why at the drain I have 12 A and through the load 2.5 A (as I expected)? What happens with…
PosFLo
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Schottky diode for low-side GaN FET

I'm working with a GaN FET for a half bridge application. During reverse conduction of the GaN FET, to minimize losses, I have to use a Schottky diode in parallel to the low side of the GaN FET. The reverse current is around 70 A. I didn't find any…
Nh K
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Bridgeless totem-pole PFC controllers

I'm considering bridgeless totem-pole PFC for a design and am looking for the quickest integrated solution. Unfortunately, it seems like a lot of implementations currently use MCUs and DSPs for control of the MOSFET drivers. While it is a a valid…
NoobPointerException
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BGA rework - Help needed

I've just started working on a PCB with BGA components (EPC GaN HEMT devices, plus BGA gate drives), and my attempts at assembly, have been quite frustrating. I'm using a heat plate (set to 150 degrees), and a hot air gun moving from 200->240->260C…
Grigoris
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