Questions tagged [safe-operating-area]
11 questions
9
votes
2 answers
What's going on with this SOA graph?
Above is a screenshot of the SOA graph from the GAN041-WSB350 datasheet.
When I saw this, I immediately got very curious, because I'm used to seeing SOA graphs where all the lines on the top right are parallel and either straight lines (for devices…
Hearth
- 27,177
- 3
- 51
- 115
4
votes
4 answers
On-state resistance limit in the MOSFET safe operating area figure
I'm trying to understand the upper-left corner of a typical MOSFET safe operating area (SOA) figure. Specifically why the region marked in red on the figure below, above the "Limit Rds(on)" line, is typically marked as outside of the SOA.
I…
avian
- 183
- 6
2
votes
0 answers
How to compute the SOA of a MOSFET?
Is there any tool to check if a MOSFET is within its SOA or not for a given operating condition?
Dibyaranjan Senapati
- 49
- 1
2
votes
1 answer
Can SiC SoA rating be extrapolated for faster pulse widths?
This datasheet for a Rohm SCT3017 silicon-carbide N-channel power MOSFET's Safe Operating Area only extends as fast as 100µs. Why no trace for 10µs?
Is it because with an expected gate charge of 170nC, the 4Ω of gate resistance limits the…
rdtsc
- 15,913
- 4
- 30
- 67
2
votes
2 answers
Precharge MOSFET safe operating area with inline resistor
I'm looking to use a MOSFET to turn on a resistive path, precharging a capacitive load. I'm considering the Nexperia BUK9608-55B, but I'm having trouble determining what my operating point is on the SOA plot.
I'll be using this as a high side switch…
matth
- 117
- 7
1
vote
1 answer
Safe Operating Area
This is my LDO. 3A part.
Input is 12V
Output is 5V.
Load current is 2A.
As per Figure 2-41 on page 15, at 85degC, I am limited to 0.2A of max load current.
How can I get the 2A load current with the Vin-Vout of 7V?
If I calculate the Tj of device…
Freshman
- 655
- 7
- 19
1
vote
1 answer
What are the safety and OSHA protocols involved in water in electrical switchyard?
Just saw a meme online:
Is this safe? What could go wrong?
Nederealm
- 157
- 4
1
vote
1 answer
SOA and varying VDS
In a hot-swap application the FET spends some time in the linear region/Saturation region before it moves into the ohmic region.
Here is a snippet of the turn on waveform seen for a FET:
Yellow is battery voltage (VD).
Green is output (VS).
Blue is…
Hasman404
- 717
- 6
- 15
0
votes
0 answers
Difference between Safe Operating Area (SOA) of two MOSFETs
I want to compare the Safe Operating Areas of two MOSFETs based on the graphs given by the manufacturers in the datasheets.
Our application is a 24 V inverter. What I concluded based on the information below is that device A can handle a higher…
Alison
- 295
- 5
0
votes
1 answer
Why do trench MOSFETs typically have a narrower FBSOA than planar MOSFETs?
I've often heard that trench MOSFETs have a narrower FBSOA than planar MOSFETs due to their cell design. The explanation I've commonly seen is that the cell design has a negative Rds(on) temperature coefficient, so if a single cell gets warmer than…
Polynomial
- 10,562
- 5
- 47
- 88
0
votes
0 answers
Compromising between Inrush and turn on time for MOSFET SOA operation
A hostwap controller as the shown here is used to to precharge and control a high side load:
In a hotswap control Q1 will spend some time in the saturation region during start up and turn off to control the inrush and will then move to the triode…
Hasman404
- 717
- 6
- 15