Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [high-side]

High-side refers to DC+ positive line.

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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 current mirror. I thought current mirrors BJT bases…
TotesMyGoats
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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 schematic, let's say I have a P-MOSFET (type SiA441DJ),…
Oliver Richter
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N-MOSFET driver for P-MOSFET high side switch

I need to create a high side switch to drive a 2.5W resistive load, which must be referenced to ground. I'm planning to use a P-MOSFET as load switch. The problem is there I have an inconstant voltage source from a battery (from 4.2V to 2.5V) and my…
Francesco
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high-side circuit works?

What is the aim of 100ohm resistor between the micro-controller pin and the gate of the N-channel MOSFET?
Ryan Pace
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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 there will be a signal inverter SN74LVC2G04 for…
Maxim
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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 74141 drivers and a microcontroller. The Nixie tubes…
Michal
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MOSFET High Side Switch of high DC voltage (60V), improvement and advice

This is my first post in this stack group, so please forgive me for any shortcomings of my question. I'm designing a circuit for a high side switch of around 60V DC (battery). Attached is a sketch of the circuit I have so far. VBat is around 60V,…
wschopohl
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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 name of this configuration? This is the circuit from…
Jack
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PNP and NPN H-Bridge - Drive PNP from opposite output

To drive the PNP transistors on an H-bridge circuit, the control voltage needs to be at least the input voltage, or a secondary stage is driving the high-side PNPs. I have come across a circuit that uses the output of the opposite switch to drive…
namezero
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MOSFET High Side conducts when low side switches in H bridge circuit

I have designed an H-bridge circuit using IR4110 Mosfets. Q1 and Q4 are OFF, Q2 and Q3 are conducting. Gate of Q1 is left floating. Q2 being high side, its gate is connected to Vcc + 12V. The gate of Q3 is connected to a PWM signal (12V square wave…
Winner
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High side current sensing for negative high voltage

I need to monitor the current for a negative high voltage supply. I implemented the following circuit in a simulation program: https://www.maximintegrated.com/en/app-notes/index.mvp/id/1867 But this only works when the high voltage is +1kV DC. …
Chris Sy
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High Side switching Raspberry PI with 3904 and 3906 transistors

I'm using an example from this post which indicates that I should be able to use a pair of NPN 3904 and PNP 3906 transistors to provide high side voltage to a load. The specific schematic I followed from that example is: The load, in fact, is a low…
Max
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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 GPIO0 as and output and go HIGH it will output…
Megamannen
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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 direct them to my arduino adc. In order to…
CKiamy
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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 directly connect it to the microcontroller. Instead I…
Simeng Fu
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