Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [low-side]

44 questions
14
votes
3 answers

Why is there a Schottky diode connected to the low-side switch

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 same time, and I also can understand why there is a…
chami
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5
votes
2 answers

Low-side switch MOSFET cannot deliver full voltage

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 MOSFET…
MTIbio
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5
votes
3 answers

H-bridge low side current sensing: Current signal with oscillation why?

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: and the pcb layout: For the current sensing i am…
Emmanuel
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4
votes
2 answers

Can you use a diode to cancel the body diode of a MOSFET?

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 the load and the drain of the MOSFET? What effect…
superN8
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3
votes
1 answer

ULN2003 low-side switch electrical characteristics

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 array (Open collector) implementation as well. I…
Harkirat
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3
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3 answers

How to manage MOSFET spikes in low side switch switch

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 impact. I am trying to learn more about MOSFETs by…
superN8
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3
votes
4 answers

Calculate temperature for low side switches?

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.) - First we used a bunch of MOSFETs and controlled…
Daniel Do
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2
votes
2 answers

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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2
votes
3 answers

3-phase inverter low side current sense

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 HIN inputs through jumpers 5 mohm shunt…
Guido Bocchieri
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2
votes
1 answer

Define the purpose of these components in the operation of this low side driver

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 (TIP120). What is the purpose of C1, R2 and D1 and…
Kyle
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2
votes
0 answers

How to drive MOSFET switches in a cascaded hybrid modular multilevel converter using a half-bridge driver "IR2103S"

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 Fig.2 instead of Fig.1). The type of the MOSFET…
ashrafayasrah
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vote
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Removing the effects of Parasitic Inductance in current sense resistor – Low side current sensing

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 inductance in PCB. During testing with R1=R3=100 Ω,…
user19579
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1
vote
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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 high and low side Vgs. Since, the gate supply is…
Ishani Engineeŕ
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1
vote
1 answer

Low side driver and flyback diode

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 of driver's feature is: Integrated Clamp for…
nikomas
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1
vote
0 answers

Low-side current sensing for FOC (synchronisation)

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 measurement of the BLDC currents. As I want to implement…
Robs_vic
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