Questions tagged [sic]
11 questions
11
votes
3 answers
Can SiC diodes run at higher temperature than common silicon diodes?
For a usual silicon semiconductor, the junction temperature is rated at 150 degree C. That said, for lifespan reasons, the usual limit for junction temperature is around 100 degree C.
My question is whether a SiC device, say a diode, can allow us to…
HYQ
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4
votes
1 answer
Turning off a MOSFET
What is the advantage of turning off a MOSFET on negative gate to source biased voltage of 5V instead of 0V? I saw that it is a very common phenomenon in SiC MOSFET as their datasheet always specifies a negative gate to source biased voltage to turn…
Alison
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3
votes
2 answers
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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2
votes
1 answer
Multiple Source Terminals of SiC MOSFET
I want to know that most of the semiconductor top side cooled package have more than one power source terminal. I can understand by doing so you can minimze the loop inductance of gate driver loop howerver it latest HU3PAK of ST it has drain, with…
Alison
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1
vote
1 answer
Estimation of Rth(ja) when not provided
I am looking at the datasheet of a SiC MOSFET, which has a junction to case thermal resistance Rth(j-c) max of 1.41°C / W.
The junction to ambient thermal resistance is not provided, as this type of power transistors are usually used with a…
Ultra67
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1
vote
2 answers
Is it a good practice to take power for gate driver from MOSFET source?
I would like to avoid using DC-DC converters for each power MOSFET in a switch-mode power supply as they are pricey, bulky, and have an input to output capacitance which can lead to common-mode noise generation.
The schematic I have in mind is the…
Roman Matveev
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0
votes
1 answer
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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0
votes
1 answer
Conduction losses calculation of a SiC MOSFET
I have a question regarding conduction losses calculation of a SiC MOSFET. What I found in different research papers and in application notes is that you calculate the power dissipated during forward conduction, reverse conduction, and body diode…
Alison
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0
votes
1 answer
Impact of reverse conduction on control strategy of PMSM motor
On a three-phase inverter working as a Master Control Unit (MCU) to control a permanent magnet synchronous motor, if we replace the IGBTs with SiC MOSFETs, what could be the possible impact of this change on overall control strategy?
Both devices…
Alison
- 295
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0
votes
0 answers
IGBT and SiC MOSFET conduction losses
What is the actual reason behind IGBTs having lesser conduction losses than SiC MOSFETs? For the same application, I can see that an IGBT having the same power rating exhibits 10 times more switching losses but 3 times lesser conduction losses then…
Alison
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0
votes
0 answers
Reverse Conduction/Third Quadrant operation of SiC MOSFET
Good Day,
I have to calculate the Conduction losses of SiC MOSFET and how I am calculating total losses is by segregating the losses into three categoriesincludes, Forward Conduction loss of MOSFET, Reverse Conduction Loss of MOSFET and Body Diode…
Alison
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