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Questions tagged [high-side]

High-side refers to DC+ positive line.

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High side switch with Raspberry Pi Pico

I'm looking for a circuit suggestion to drive a 5v resistive load that draws up to 400mA using a Raspberry Pi Pico with a high-side switching circuit. Most every example I could find used an external ...
MagicSmoke's user avatar
2 votes
1 answer
92 views

High-Side NMOS Short Circuit Protection: How to Calculate Maximal Allowed Turn-off Time?

I'm about to build a high-side MOSFET switch that can switch voltages up to 150V to an external load (0.5A nominal). For this application I would like to use the N-Channel MOSFET Vishay SiHH240N6E. ...
Mau5's user avatar
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1 answer
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Driving NMOS source with a separate power supply

I am trying to see whether I can turn on 28 V voltage rail from a 5 V input signal using an N-channel MOSFET (NMOS). I am using IRF530N for now which has a threshold voltage of 4 V. I just modeled it ...
nmr's user avatar
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1 answer
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Diodes selection for High Side switch protection against inductive load

Hello I would like to design protection for HSD, BTS7200-2EPA against inductive load. Spec data for the inductive load is limited. But the PCB was designed for 2.5A peak, and approximate L and R_L ...
min_c's user avatar
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2 votes
1 answer
186 views

High-side driver current monitoring via microcontroller

I'm building an automotive power distribution module which makes use of the Infineon BTS50010 high-side driver. The high-side driver current is monitored via the sense pin (IS) connected to a ...
Joe's user avatar
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5 votes
3 answers
571 views

Understanding the safe operating area for low values of Vds

I am designing a circuit where a logic level signal switches an NPN BJT (Q1A) which turns a P-channel MOSFET (Q2) on as a high-side configuration to power a load (...
tamasgal's user avatar
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1 answer
72 views

How can I make a switch using a MOSFET to control an input signal? [closed]

I have a two channel relay module that takes 12 V to power. It also has two inputs, which take either 12 V or 0 V. On the other side of the module are the NC and NO and COM pins that I am connecting ...
Jordan Klaers's user avatar
1 vote
0 answers
84 views

MOSFET high-side 12 VDC switch lets the "magic smoke" out of my D1 Mini

Edit: I don't know if it's better to post an answer myself or add this comment here, but thanks to the comments from @Ale..chenski and @KevinWhite I realised that the problem was not with the MOSFETs ...
Dan's user avatar
  • 11
1 vote
4 answers
296 views

High-side current sensing using PNP

I have the following three states: State 1: When system is active with transducers, current through the load is approximately 350 mA. State 2: When system is activated without transducers, current ...
user101095's user avatar
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1 answer
119 views

Figuring out high side N channel MOSFET switching

I'd like to build a high side N channel MOSFET as I want to make a BLDC ESC. I need one on the high side and one on the low side so I can change the polarity. I thought N channel MOSFETs were the best ...
8MB_SSD's user avatar
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ZXCT1084 Current sensor does not provide output signal

I am trying to create some kind of on/off switch, which would disable one sensor if the other is plugged in. I was thinking of creating up-side current sensing circuit, which would send voltage level ...
Dominykas's user avatar
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3 votes
3 answers
644 views

How to do high voltage high-side switching in a simple and power efficient way?

Background I am planning a system that needs to maintain low power draw (especially when in its standby state), which means I need to use some switches to turn off parts of the system when not needed. ...
ScottyN91's user avatar
0 votes
1 answer
101 views

MOSFET h-side turn on

I implement following circuit I used 12v alarm instead of led at high side. I used two 5.6k Ω resistor (blue) at place of Rg and 330 Ω resistor in place of R1 I used the same IRF630 n-channel mosfet ...
Jakub Kutrzeba's user avatar
1 vote
3 answers
839 views

Bootstrapping circuit vs. charge pump for high side switching

I am designing a circuit where I need to do some high side switching to turn on/off the power to a circuit (part of some protection circuitry). This switching is actually very slow and only occurs ...
Samuel Snerden's user avatar
2 votes
3 answers
497 views

Driving a 12V ~500mA load with a 3.3V logic level special pin GPIO0 on a ESP07s and ULN2003

As some of you know GPIO0 is a special pin that needs to be pulled HIGH during start-up else the ESP07s enters flash mode. Questions: The pull-up to 3.3V works right? My thinking is that if I have ...
Megamannen's user avatar
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55 views

Active Half-Bridge Driver Circuit

Consider the folLowing half bridge circuit: I'm designing a half-bridge circuit to be controlled by a microcontroller. Ultimately, there will be 3 copies of this circuit for an ESC. I am hoping to ...
Levi Applebaum's user avatar
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0 answers
116 views

Gate driver circuit design for High-side and Low-side

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
  • 13
1 vote
1 answer
398 views

N-channel as high side switch is always on

The end goal is to use an N-channel mosfet (SiS176LDN) to drive as strip of LEDs with a stack voltage drip of 20 V and run at 4 A, I chose this specific mosfet because it seemed to be logic driven. It ...
roaibrain's user avatar
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0 answers
53 views

select the proper HALF-BRIDGE DRIVER for DC motor application

I was looking for a HALF-BRIDGE DRIVER for my H-bridge and BLDC motor projects, however, I found most of the MOSFET gate drivers are two types One has SD (Logic input for shutdown) and IN (Logic input ...
Hamid s k's user avatar
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0 answers
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Buck Converter Gate-Source Voltage anomaly

I have a desinged a buck converter which has a high side MOSFET, and due that when simulated on ALTIUM the circuit did not work as expected without a bootstrap configuration. Now with the bootstrap it ...
Lakshman's user avatar
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0 answers
73 views

LTC7000 IC Iset pin broke in some way

I have a LTC7000 IC schematic like below. IC fault pin show around 10V and its fine. I can turn on and turn off mosfet at least 3 or 5 times. I can turn off mosfet under without current and after that ...
Ali Buğra ÇETİN's user avatar
1 vote
0 answers
122 views

Choosing an appropriate gate driver for IRLZ44N high side for a buck converter

For the TL;DR folks: Need high side NMOS gate driver IC, similar to Julian Ilett's DCOI driver but cheaper, higher switching speed and less complex; THT highly preferred, because 1,27mm perfboard is ...
Bednar121's user avatar
8 votes
3 answers
2k views

How is this a current mirror?

This article is talking about floating an IC's GND to use it at a common mode voltage higher than it is rated for. It then says it level shifts the IC's current output to ground by using the Q1-Q2 ...
TotesMyGoats's user avatar
0 votes
3 answers
54 views

IRLML9301PBF as high side switching for 5 V, 2 A load from a 3.3 V uC?

Circuit: simulate this circuit – Schematic created using CircuitLab I would like to cut off the power to my APA102-LED-strip during uC sleep - as the standby current of these strips is relative ...
Stefan Krüger s-light's user avatar
0 votes
1 answer
61 views

GND nomenclature for high side switch

Ref What is the difference between device GND & board GND? The term 'GND Shift' is used multiple times? Does it mean a change in GND potential from 0V to say, +x Volts? Could you give an ...
Harkirat's user avatar
  • 121
0 votes
1 answer
185 views

High side switch with inductive loads

Seeking help with the following datasheet. Section 9.4.3 Didn't understand the above calculations. It states that for inductive load energy dissipation, the energy from the source and the load is ...
Harkirat's user avatar
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0 answers
78 views

Electrical characteristics for high-side switch

Ref What is the role of KCL Previously, when I encountered this parameter, it was used in calculating the value of RCL, but it only had a single value eg say, 2500. Could you explain the role of KCL ...
Harkirat's user avatar
  • 121
0 votes
1 answer
67 views

Need help TPS1H200 High Side switch

TPS1H200A-Q1 How is does the FAULT pin work? (from what I gathered when I(lim) threshold it hit, fault is reported as FAULT = LOW. During normal operation FAULT = HIGH (no issues) How / where is the ...
Harkirat's user avatar
  • 121
4 votes
4 answers
2k views

Logic-level, high-side, P-channel MOSFET switch

I want to use a MOSFET for high-side switching of the DRV425 fluxgate as it has no enable pin, and has quite a high power consumption (150 mW @ 5V -> 30 mA): Before the P-channel MOSFET WTM2301 ...
Maxim's user avatar
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0 votes
0 answers
40 views

High voltage sensing - voltage to current converter

Hi i need to sense the voltage of a floating load anbd TI suggest placing a sort of common emitter amplifier as shown below: however im not sure how they calculate the sense voltage: How is the ...
KMN's user avatar
  • 388
1 vote
0 answers
59 views

Connecting the GND of an isolated circuit to the positive side of a 450V transformer output

I moved to a new company that makes very big old-style controlled rectifiers. They asked me to make a new modified, and enhanced thyristor-controlled rectifier. The strangest problem I faced is that ...
AlMoutaz Billah's user avatar
1 vote
0 answers
149 views

Gate source voltage of half bridge with bootstrap capacitor incorrect when measured

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
1 vote
1 answer
1k views

Self-boost charge pump for high-side driving: how to drive the high-side driver itself?

This is the circuit: My question is: how can I send signals to the high-side MOSFET driver? I thought about this way: But "B" may be 0 V when the MOSFET is on, resulting in a negative ...
lidorov19's user avatar
1 vote
6 answers
563 views

Should I connect the base of a 5 V high-side PNP to a 3.3 V GPIO IC?

I'm trying to drive a 5V 200mA fan from a PCF8574 powered by 3.3 V. For context, I asked a separate question about using active low vs high on this expander, and @Justme recommended using a high-side ...
Nick Bolton's user avatar
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1 vote
1 answer
210 views

Only low-side output from MOSFET drivers is working

I have 4 N-channel MOSFETs connected in a bootstrap configuration with an IRS2108 MOSFET driver. Currently, only the low-side output works with this circuit. I am not sure why that is. The schematic ...
EmeraldMonk's user avatar
1 vote
1 answer
478 views

Discrete high-side driver for GaNFET

Background: I am designing a buck/boost converter to convert back and forth between my supply voltage of 3.6 V (battery) and an output voltage of VDD = 60 V to bidirectionally drive a capacitive ...
Son-mic's user avatar
  • 11
0 votes
0 answers
78 views

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 ...
Hasman404's user avatar
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2 votes
2 answers
431 views

High side current sensing amplifier placed on low side. Possible?

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
  • 53
2 votes
2 answers
187 views

P-CH MOSFET high-side switch not turning on

The datasheet of SE2305Q is HERE I have an LCD screen that comes with a backlit_power pin which requires 3.3 V to light up. It draws quite some current, and I don't think it is good practice to ...
Simeng Fu's user avatar
2 votes
1 answer
193 views

High-side IGBT driver

I am trying to implement a high-side gate driver using an IR2101. The power supply of the IGBT can go up to 60 V and 9 A. The idea is to switch ON Q1 using high-side circuitry and then switch OFF Q1 ...
Mayur's user avatar
  • 59
1 vote
2 answers
1k views

High-side MOSFET switch

I would like to switch 3 separate 60 V, 20 A fused loads on/off high side from an ATMEGA328P. It needs to be switched high side for 2 reasons, I don't want live to have the potential to short to ...
Jay Dee's user avatar
  • 339
0 votes
1 answer
179 views

High current shift register source (mic5891 alternative) [closed]

I'm trying to control 60 loads (solenoid valve with integrated control circuit,12v dc) requiring high side 50mA source current control signal using an MCU (3.3v) I need to control them individually so ...
Giuseppe Maggio's user avatar
0 votes
2 answers
1k views

Maximum output voltage for a buck converter with IR2110 as its driver

I'm currently making a buck converter (rated output of 60V/10A) with IR2110 as its high side NMOS driver. The driver and buck converter circuit can be seen in fig 1 and 2. I've asked a bit on this ...
Kevin's user avatar
  • 101
0 votes
1 answer
136 views

P-MOSFET - voltage on a drain pin when fully off

I'm trying to implement high side switch using P-MOSFET with NPN driver. I will drive the whole switch with AVR GPIO running at 3.3V (3.3V GPIO label). KT231B9 (it'...
Drobot Viktor's user avatar
0 votes
1 answer
285 views

High side power switch IC drops 0.5V when loaded

I setup a circuit shown in AP2411 data sheet on a solder-less test board and connected the output to 30 ohm resistor to ground to simulate about 100mA of current. Input voltage is 3.3V from a lab ...
vgeng's user avatar
  • 49
0 votes
0 answers
27 views

DIODES' AP2411 high-side switch usage

I built circuit for DIODES' AP2411 high-side switch on a solderless test board and connected the output to 20 ohm resistor to ground. Input voltage is 3.3V from a lab power supply. The output voltage ...
vgeng's user avatar
  • 49
2 votes
2 answers
1k views

Solid state relay output connection: Is there a difference between high-side and low-side switch configurations?

I am planning to use this SSR chip. I decided to use the "Connection C" configuration which is given pictured in the 2nd page of the datasheet. However, there is something I don't like ...
hkBattousai's user avatar
  • 14.1k
3 votes
2 answers
174 views

High-side current sensing questions: Gain formula and circuit type

What is the formula for the gain in this circuit? I can not find a good description of the operation of this high-side current measurement. Why is there a PNP transistor at the output? What is the ...
Jack's user avatar
  • 33
8 votes
5 answers
10k views

Can you drive a P-MOSFET as a high side switch directly from a microcontroller?

I have an engineering background, but close-to-zero practical experience with discrete electronic circuit design. simulate this circuit – Schematic created using CircuitLab Regarding the above ...
Oliver Richter's user avatar
4 votes
5 answers
1k views

High side switch for high voltage Nixie tube

Short version: I am looking for a high side switch (20mA, 400V) circuit for half wave rectified mains, which I would be able to control with 5V GPUO. Long version: I am building a Nixie clock with ...
Michal's user avatar
  • 63