Questions tagged [body-diode]

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Freewheeling diode position [duplicate]

I have a pneumatic solenoid valve switching from IRF830 MOSFET. Solenoid valve connected to MOSFET by 2-3 feet long wire. It's necessary to use a freewheeling diode for this? What is the most ...
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0answers
43 views

Improving effciency in medical implant with load switching

I'm trying to design and simulate the Q-modulation technique for a body implant. The technique involves two loops: one outside the body, with resonating LC tank producing a big voltage. Another loop ...
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2answers
71 views

Forward diode characteristics not starting from zero Ampere

Why the current is not starting from zero, whats the diode characteristic when current is near zero? Reading the datasheet for N-channel 60V MOSFET, I encountered this source-drain characteristic of ...
2
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0answers
75 views

NMOS bidirectional variable resistor: How to increase body diode barrier potential?

I want to use an NMOS as a variable input resistor to an inverting amplifier. The source is connected to virtual ground and the drain is connected to the input. I need to accomodate both positive and ...
2
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2answers
2k views

ORing mosfet controller with ability to switch off the load

My system is powered from a wall adapter and backup SLA battery. simulate this circuit – Schematic created using CircuitLab Since the voltage of the wall adapter is higher than the SLA, I have ...
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0answers
121 views

How can I map Body Diode datasheet params to simulink N-MOSFET model?

I would be interested on including the body diode effect of a NMOS transistor into the N-Mosfet that Simspace includes for electronics. However, the parameters that the Body diode in Matlab requires ...
2
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1answer
521 views

Turning an NMOS with substrate terminal into a PMOS

Some NMOS's come with a substrate/bulk/body terminal so the "Source Voltage" referred to in literature then Substrate Voltage. Say then we short the gate to the drain and have the substrate take the ...
4
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2answers
2k views

I need some help understanding overshoot and ringing in MOSFET half bridges

From FDA75N28 datasheet: What I am having difficulty understanding are the reasons behind overshoot and ringing in V_DS. Now, to what I already know: The current that passes in an inductor cannot ...
2
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3answers
2k views

Where does the MOSFET body diode come from?

Where does the body diode in a MOSFET come from? I understand that its built in and an intrinsic part of the MOSFET. All illustrations of a MOSFET that I've seen depict the structure as two diodes ...
1
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3answers
1k views

MOSFET with *actual pin* for body

I have always thought that MOSFETs have four pins [see wikipedia], one of them connected to the body (i.e. substrate). However, when trying to order some, I have been completely unable to find any ...
1
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0answers
144 views

Extra Shottky Flyback Diodes on FET-based BLDC Motor Driver? [duplicate]

TL;DR: I have a FET-based BLDC motor driver design, and I need to decide whether to add discrete Shottky diodes in parallel with each FET for reliable and long-lived operation in an automotive-like ...
1
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1answer
2k views

Body Diode of a MOSFET

So for some MOSFETs, specially with Power MOSFETs, the body diode is a flyback diode that (as far as aI can tell) can be conveniently added to the MOSFET's bulk as there already PN junctions (correct ...
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1answer
1k views

Substrate Connection when driving a Bi-Directional Switch

I am very confused about the way the below circuit functions. Below is an excerpt from a research paper which shows two NMOS transistors connected such that the body diodes face each other back to ...
3
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2answers
2k views

Use of MOSFETs body diode

I have an N-MOSFET array IC and I don't need to use all of them, but I do need to use a diode. Is it OK to use the body diode of one of the MOSFETs as a regular diode to decrease component count and ...
3
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5answers
2k views

Replacing a Switch and Avoiding body diode conduction

I am trying to design a replacement for a 2:1 switch using FETs, which would be really easy if I didn't have to concern myself with the body diodes that are present on PMOS transistors. My scenario ...