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Disclaimer: Sorry for my ignorance - I'm a computer scientist but not an electrical engineer. It seems at first glance that this designation should be the other way around. N-type MOSFETs have the ...
Collin Quiason Rottinghaus's user avatar
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3 votes
2 answers
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So the first part of this question How to switch power to a sensor has been asked in a few posts before (e.g. here). However, I want to find out a more nuanced part of this question. The setup ...
eckh_ma's user avatar
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4 votes
6 answers
445 views

I have a power on/off switch circuit with an N-MOS as a low side switch. I need an isolated gate drive for the N-MOS. The plan was to use an optically isolated gate driver chip. The gate drive supply ...
Syam's user avatar
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3 votes
1 answer
186 views

I made a PCB that takes 12V power in and passes it to the output connector, except the GND connection on the output has a low-side switching circuit through an N-channel MOSFET. The gate of the MOSFET ...
Denis's user avatar
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1 vote
1 answer
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I am designing a Power Monitoring and Protection board that is going to sit in between a 5-Series (~70V) Lead Acid Battery and a load. This board has a Energy Monitoring IC from TI - INA237AQDGSRQ1 ...
Abhijith V Narayan's user avatar
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1 vote
3 answers
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I have a question about MOSFET switching. I have a 126V voltage source and I want to drive it with a PWM signal. There will be a buck converter at the output of this MOSFET. What is wrong with this ...
Knoples's user avatar
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1 vote
0 answers
76 views

I have a circuit with an electronic load in parallel with an optocoupler and a low-side N-channel MOSFET connected to the circuit. The low-side N-channel MOSFET driver is supposed to source current ...
zsch3000's user avatar
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2 votes
1 answer
279 views

In a special project I'm trying to do PWM current control of a electromagnet like application. This project is special because it has to pass very strict EMI tests (<30Mhz radiated emissions). ...
Jeroen3's user avatar
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1 vote
2 answers
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I made a simple circuit using an IRF630N to drive my loud buzzer. The Arduino code is very simple, just high and low on the pin for a fraction of time. Following is the schematic of the circuit After ...
Hamid s k's user avatar
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0 answers
173 views

I am designing integrated DC-DC converter with multiple output. As I am new to Analog design, I am trying to figure out what type of circuit topology is to be used for high-side and low-side switches. ...
aguntuk's user avatar
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0 votes
3 answers
638 views

I am trying to use an NMOS(2N7000BU) to "turn off" the LM350 voltage regulator. I have an OR gate going into the gate of the mosfet, so either input will turn it off. The hope was to ground ...
Max's user avatar
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1 answer
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Say I have an MCU switching a couple SSRs using the ubiquitous ULN2803 at 5V on the "common" pin, but I'd like to switch a 12V mechanical relay with the same chip as well. Checking the ...
Joe's user avatar
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3 answers
236 views

I'm building a battery-based wireless weather monitor for hobby project. for longer battery life, I want to control the power of each subsystem separately. Let's take a NRF24 modem for example: ...
Yukihyo's user avatar
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4 votes
2 answers
2k views

From what I understand, MOSFETs inherently have a diode between the source and drain known as a body diode. If I were to use an nMOSFET as a low side switch, would it be bad to have a diode between ...
superN8's user avatar
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3 votes
1 answer
398 views

ULN2003A So I'm currently exploring low side switches. I started off with an NMOS transistor array IC (Open drain), to develop a better understanding I've tried to understand the Darlington transistor ...
Harkirat's user avatar
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1 answer
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I have some questions regarding the TPL7407LA-Q1 low-side switch. As far as I know, this IC is typically coupled with GPIO pins on a microcontroller, so supply voltages are limited. On the product ...
Harkirat's user avatar
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I've seen lots of questions here about various spikes/overshoots/transients when using MOSFETs but when I try to apply the solutions to my circuit I can't seem to apply them in a way that makes much ...
superN8's user avatar
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0 answers
385 views

We are evaluating MIC21LV32 from microchip in one of our applications. For the current sensing we have used 3 mΩ sense resistor (1206, 1 %, 1 W), as these sense resistors have higher ESL+ parasitic ...
user19579's user avatar
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1 vote
0 answers
163 views

I have a gate driver circuit (Bootstrap capacitor for high side) as in the given diagram. I measured the Vgs for high and low side as shown in the figure below. I get the wrong voltage level for the ...
Ishani Engineeŕ's user avatar
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0 answers
321 views

I need a dual low-side gate driver but there are just single output N channel drivers in LTspice.
Shamurov's user avatar
  • 367
2 votes
2 answers
774 views

I am trying to build a custom 12 volt battery current sensor for my car as a little hobby project. I want to place a shunt on the negative side of the battery, and get the measurements from there and ...
CKiamy's user avatar
  • 63
2 votes
3 answers
1k views

The setup I'm currently doing some experimentation with 3-phase inverters for BLDC motors and current sense. I have at hand this board featuring: IR2103 MOSFET driver. LIN# inputs are connected to ...
gbock93's user avatar
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1 vote
1 answer
511 views

I wanted to control electric door lock (12V, 1.5A peak, unlocking time < 200ms) with Self-Protected Low Side Driver like NCV8412 (https://hr.mouser.com/datasheet/2/308/1/NCV8412_D-2317556.pdf). One ...
nikomas's user avatar
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1 vote
0 answers
1k views

I am working on the implementation of an FOC controller for a BLDC motor and I am confused about the synchronisation I should perform between ADCs and PWM. The setup implements 3 leg low-side ...
Robs_vic's user avatar
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14 votes
3 answers
3k views

I am trying to understand the reason for having a Schottky diode for protection in a buck switch by reading here. To summarize, I can understand why two the switches should not be turned on at the ...
chami's user avatar
  • 649
1 vote
1 answer
352 views

I have what I thought was a simple relay circuit but the relay is always on. This is the part of the project that is not working Q5 never switches off. To simplify it further I removed the relay and ...
AndrewT's user avatar
  • 263
1 vote
1 answer
169 views

In my application I need to drive a 240W pure-resistive load with a nominal voltage of 24V. The input is a standard 280W AC-DC external power adapter, the Meanwell GST280A24. The load switch is ...
Francesco's user avatar
  • 1,075
2 votes
2 answers
149 views

Under some user suggestion, I decided to drive my 10-ohm load heater using a low side NFET. I put a 1k resistor (R1) at the NFET gate to reduce ringing. I got, before placing the resistor, a very bad ...
Daniele's user avatar
  • 305
3 votes
4 answers
257 views

I would like to know how to calculate the temperature (to see if I am still in a working range) for a low side switch. Hope you can help me there. I need to control 10 valves(12/24V - 500mA max. ea.) -...
Daniel Do's user avatar
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1 vote
1 answer
543 views

I'm pretty new to electrics/electronics. I'm sorry if I make dumb questions, and thank you for your time. I wanted to control my LED strip shipped from Ebay, which works well with 12V 2A DC adapter. ...
Potados's user avatar
  • 15
0 votes
1 answer
661 views

As a now-professional EE, I'm slightly embarrassed to be asking what I feel like is a simple question. But I'm stumped and google isn't giving me good answers. I'm trying to PWM a string of LEDs via a ...
Axel's user avatar
  • 175
0 votes
1 answer
82 views

I would like to find a way to sense (or detect) current through an opto-coupler. This opto is used to power an electromagnetic brake, but depending on the type of brake the current through it can ...
Alex Er's user avatar
  • 111
0 votes
1 answer
2k views

I would like to disconnect the current in the system with a battery (using N-MOSFET in a back to back configuration). I would like the circuit to be on the low side and without a driver. At this point,...
kamil's user avatar
  • 1
2 votes
1 answer
100 views

I am trying to understand the operation of the following low side driver circuit I found in a schematic of an old pinball machine (redrawn for clarity): L1 is a Solenoid and Q1 is a Darlington BJT (...
Kyle's user avatar
  • 23
0 votes
2 answers
434 views

I am developing the BLDC motor controller board and I have problems with low-side gate driving. I am using MC33035 BLDC motor controller. PWM for speed control is fed into low-side MOSFETs. High-side ...
Eugen's user avatar
  • 61
0 votes
0 answers
272 views

As the title mentions, I need to implement a design that would require an IC that can be driven in high-side, low-side, or push-pull configuration. The main purpose for this is that I need to drive ...
ctrud's user avatar
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1 vote
1 answer
201 views

I've been given this schematic to review it (I'm working on a formula student team.) It is used for cutting off the power to a motor through a N-mosfet (NCV8402A). The 12V are being supplied through ...
BrokenFlap's user avatar
  • 13
2 votes
0 answers
314 views

I am trying to drive the MOSFET switches in a cascaded hybrid modular multi-level converter as shown in Fig. 1. Fig. 2 is used here to simplify the circuit and to present the problem (let's focus on ...
ashrafayasrah's user avatar
  • 21
0 votes
0 answers
125 views

I ran into this issue while working with WeMos D1 Mini and Adafruit's timer board. I had an N-channel MOSFET that was driven by the timer's DRIVE pin. When ESP was done doing its thing it would ...
Alex C's user avatar
  • 115
5 votes
2 answers
540 views

I have designed a portable lens heater prototype. Using: 18650 Li-ion battery Arduino ProMicro (3.3V , 8MHz) by adafruit (https://www.sparkfun.com/products/12587) Push button switch PMV16XN N-channel ...
MTIbio's user avatar
  • 51
1 vote
1 answer
650 views

One of the main reasons why we don't use low-side current sensing for PSUs is that we want the ground to be, 'ground'. adding a shunt resistor will rise the ground slightly higher. In real world ...
ElectronSurf's user avatar
  • 2,558
0 votes
3 answers
1k views

I've been trying to make a 3 phase inverter to drive a BLDC motor. Mosfets : IRF3205 Driver : IR2101 Supply voltage for FETs and drivers : 12V BLDC : https://media.digikey.com/pdf/Data%20Sheets/...
PIC16F84A's user avatar
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1 vote
1 answer
604 views

I am applying a 3.3 V pwm signal to a circuit similar to the following (Credit: Olin Lathrop): I am using an IRLR024N N-MOSFET, which switches if i connect the gate to the 3V3 pin of my ...
jumpingwires's user avatar
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1 vote
0 answers
419 views

I'd like to isolate, with high-side and low-side switches, a RLC circuit after the inductor has been energized with a current of 2-3A from a 12V source (see sketch). When the RLC circuit is isolated ...
HBua's user avatar
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0 votes
1 answer
2k views

I have a n channel MOSFET controlling a high current LED panel. The FET is driven by a FET driver, which is itself driven by a MCU pin. I am using PWM to control the LED brightness. I want to double ...
Kyle Hunter's user avatar
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1 vote
1 answer
278 views

I have an application where I need to drive 2 piezoactuators in a push-pull arrangement (voltage 180deg out of phase with each other) where the charge/discharge time is about 50 microseconds and the ...
Marin's user avatar
  • 21
0 votes
1 answer
2k views

On the technical sheet of a motor controller integrating two BTS7960B (picture below), the description of the 8 PINs on the board is as follows: RPWM: Forward level or PWM signal input, active HIGH ...
GuiTeK's user avatar
  • 195
0 votes
1 answer
937 views

I'm working on a power electronics project where it involves driving 4 different MOSFETs, (3 HighSide and 1 LowSide). Rather than using a different IC for the LowSide driver, I am thinking about using ...
Padmal's user avatar
  • 352
0 votes
2 answers
372 views

I have an application where I need to measure the current on a relatively high voltage rail. The problem is that the current on the rail is quite low, only about 20 mA. Because of the high voltage, ...
user3256536's user avatar
  • 3
5 votes
3 answers
2k views

my problem is the following: I am using two DRV8842 H-bridge ICs to control 2 different brushed DC motors, my intention is to use a PI controller for the current loop. The schematic looks like this: ...
Emmanuel's user avatar
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