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What's causing this ringing? GaN SEPIC Converter Gate Ringing

I'm designing a SEPIC converter using a HEMT GaN from EPC (EPC2204) and a dedicated GaN driver IC (1EDN71x6U). I've been in this loop (mind the pun) trying to mitigate gate ringing, and I'm having a ...
Alex Turner's user avatar
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2 answers
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GaN @ low voltage

Is it possible to achieve a better efficiency with GaN rather than Si at low voltage (<~ 20V) I mean GaN is known for having low parasitic capacitors and so it allows to have low switching losses. ...
Jess's user avatar
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Estimating GaN HEMT junction temperature

I think it's quite a simple question, but the solution is not so obvious for me. I know the equation Tj=Ptot×Rth+Ta, the thermal resistance Rthj-a and RDSon temperature dependance come from the ...
Den's user avatar
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GaN Ripple with dropout to 0 volts on turn on

I'm currently troubleshooting a GaN SEPIC converter that uses a non-synchronous control IC (LM5022), driving a GaN gate driver and a small GaN FET. The circuit is operating as expected however I'm ...
Alex Turner's user avatar
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37 views

Can Si PMIC controller gate outputs drive GaN Drivers?

I have a boost converter design based on an LM5022 PMIC incorporating a 1A gate driver. I'm looking to experiment with a GaN IC and driver (1EDN71x6U), which specifies that it's expecting logic-level ...
Alex Turner's user avatar
1 vote
1 answer
61 views

How a cascode GaN can have a low Rds(on)?

GaN power device are said to have a lower Rds(ON) than Si MOSFET and according to the picture below there is no doubt about it. Source: IEMN Nevertheless as GaN power devices are particular devices, ...
Jess's user avatar
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3 votes
2 answers
355 views

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 ...
Jess's user avatar
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119 views

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 ...
Nh K's user avatar
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0 votes
1 answer
111 views

Bridgeless totem-pole PFC controllers [closed]

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 ...
NoobPointerException's user avatar
3 votes
1 answer
403 views

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: ...
tobalt's user avatar
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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 ...
Grigoris's user avatar
2 votes
1 answer
120 views

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 ...
Rahul's user avatar
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0 answers
76 views

ZVS Flyback - GaN / Si

I am reading a datasheet of a ZVS flyback controller. In it are written the following lines: These lines explain that the controller is looking at the switching node of the primary MOSFET (drain) and ...
Jess's user avatar
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2 votes
2 answers
268 views

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 ...
victor_uk's user avatar
4 votes
0 answers
836 views

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 ...
Jess's user avatar
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0 votes
1 answer
121 views

GaN Power transitor said to "reduce EMI"

I have no experience in GaN, I am currently discovering the subject and I was studying a design from Infineon and I found on a GaN power transistor the following benefits: Here is the datasheet: ...
Jess's user avatar
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2 votes
1 answer
551 views

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 ...
James Hancock's user avatar
4 votes
1 answer
367 views

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 ...
Jess's user avatar
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0 votes
1 answer
385 views

Estimating case to ambient thermal resistance when it is not given in the datasheet

I'm trying to estimate the case to ambient thermal resistance of a GaN switching device (specifically the GS66508T device from GaN Systems). The datasheet provides the junction to case thermal ...
ggg123's user avatar
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2 votes
3 answers
753 views

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 ...
Russell Mirov's user avatar
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61 views

Chargers for modern devices, understanding compatibility

When a device (say a modern MacBook charger or GaN charger) lists modes, such as... ...
Woodstock's user avatar
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1 vote
0 answers
128 views

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 ...
kjav's user avatar
  • 11
3 votes
2 answers
667 views

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 ...
neubert's user avatar
  • 141
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1 answer
730 views

DC-AC converter with GaN in Ltspice

I'm simulating a DC-AC SPWM converter in Ltspice with a GaN E-HEMT (https://gansystems.com/gan-transistors/gs66516b/) but I'm having problems because I get the error for the time step to small. This ...
AL0203's user avatar
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3 votes
0 answers
268 views

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 ...
Iron Maiden's user avatar
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