Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [rdson]

23 questions
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3 answers

Paralleling mosfets to reduce Rds On?

This if a fairly simple question. I have some APT43M60L MOSFETs with a fairly high on resistance. They get quite hot and waste a lot of power in my induction heater. They work great but get really hot really quick. I tried IRFP250M MOSFETs, they…
ElectronicsNoob
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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
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Is this setup for measuring MOSFET RDS_On correct?

I ordered some MOSFETS from AliExpress and I think I've been duped. The diagram below shows my setup: If I'm not mistake, this means that the R_DS(On) of this N-channel MOSFET is 0.042/0.62 = 67 milliohms, at a V_GS of 3.83V. The datasheet for this…
UnknownDagger
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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
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MOSFET Vds and SOA graph

I have a question regarding the SOA graph and a low Vds voltage (below 100mV), I will get to the questions below but needed to layout some information first. I am looking at a International Rectifier part IRLMS6802PbF, RDS(on) data from datasheet…
Suze1990
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Calculate MOSFET Forward Voltage Drop

I'd like to better understand how to calculate the voltage drop between the Drain and the Source of a FET. As an example, say we have a MDD1902 N-channel FET. How would I determine the maximum voltage drop that can occur over Vds if the max drain…
Tim51
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LTspice - What is the best way for having Rds(on) curve of a MOSFET?

I am trying to get the Rds(on) of a MOSFET. I have tried different methods and I do not know what is the best method. There might be a method that is better than the ones I used. In practice, it seems that they use a specific device which sends a…
Jess
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Mosfet Rdson inconsistency in datasheet? Or conceptual error?

I was checking the datasheet for the Allpower AP2012S and while checking the graphs to determine the Rdson in my point of operation I found what I think might be an inconsistency, however, I wanted to be sure since I'm no expert. By checking Figure…
Mateo Ardila Villegas
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RDS measurement on P-Channel MOSFET

I want to measure the Rds-ON of a P-Channel MOSFET and I have setup the test circuit as follows: I keep the source at constant +10V and vary the step the gate voltage up in the increments of 1V. Then I measure the resistance across the drain &…
Zaffresky
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MOSFET Gate Charge dependance on temperature at HOT, to determine charge needed to design driver?

i am designing this push and pull driver for external NMOS in my buck topology circuit. i am well aware the gate charge ( based on Cgd) i need to turn FET ON and OFF at room temperature based on datasheet. But i do not know how much charge i need at…
Narendra Mane
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Vds vs. Rds(on) on 19N10L mosfet

I measure in common source connected mosfet (19N10L) Vds about 2.4V in on state. The current is 2A. In datasheet is defined Rds 0.1ohm. Why is Vds in this mosfet so high (2.4V)? Shouldnt be Vds = 0.1 x 2A = 0.2V? Vcc is 18V.
user208862
1
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1 answer

What is the parasitic resistance due to an IC package in a mosfet? (or any package)

How much resistance does the package of an IC contribute to the paraistic resitance of a circuit? (most applicable to mosfets)
Voltage Spike
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P-MOSFET Rdson values with Vgs near maximum

My understanding is that a MOSFET's Rdson generally decreases with higher absolute Vgs values within its specified range, and I typically consult datasheet curves showing Rdson vs Id and Vgs. I'm looking at P-MOSFETS for an application with…
JAE
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DC-DC boost converter theory / principle / testing

I am trying to setup a DC-DC boost converter circuit that can convert 50-60 V DC to 86.4 V at the most current I can achieve a reasonable efficiency of say 90%. Mostly for the learning curve but my practical use is charging a 56 parallel by 24…
Jay Dee
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Help solve rds for pchannel FET from this datasheet

I would like to use a pchannel FET as a voltage controlled resistor in a circuit where my voltages are between 0 and 1.1 Volts. I'm hoping to use the J175 but truthfully I am having a difficult time even deciphering this datasheet. Am I just tired…
RobMcN
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