Questions tagged [high-side]

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4answers
99 views

high side switch using NMOS

I'd like to dim an ordinary 3-pin PC fan with a 3.3V-PWM at its 12V power supply pin. As I also need to measure the tachometer signal within a 3.3V logic level circuitry I'd like to switch the fan on ...
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1answer
99 views

High side current sensing

I want to sense 30 amps of current using op amp in high side. I know that there are many dedicated current sensing amplifiers for this purpose. But I'd like to try it with an op amp. I have tried high ...
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0answers
57 views

Humming and voltage drop on p channel Mosfet

I am designing a high side switch using P-Mosfet to drive a heat element. The Mosfet is driven by PWM from MCU, which in the test is around 40Hz, 10% duty. Here is the schematic I am testing. I am ...
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1answer
49 views

Transistor Biasing of high side switching network for PWM control

simulate this circuit – Schematic created using CircuitLab iagramI am attempting to create a high side switching circuit for a string of LEDs wired in parallel. There are multiple strings, all ...
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2answers
59 views

Oscillations on High Side Sensing Current Source

I designed a simple adjustable constant current source that uses high side sensing but I can't seem to figure out where the oscillations on my output are coming from. The circuit is shown in a picture ...
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1answer
52 views

Can I use a voltage controlled resistor to adjust high side switch current?

A number of high-side switches (e.g. the NCP380) go into constant-current mode when the programmed maximum current is reached. This is typically set with an external resistor according to the required ...
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0answers
21 views

Profet Smart Highside Power Switch Output Always 'High'

I bought the Infineon Smart Highside Power Switch - PROFET BTS442E2, in order to switch a ~16V supply using a logic level PIR sensor. BTS442E2: http://www.mouser.com/ds/2/196/Infineon-BTS442E2-DS-...
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1answer
100 views

high side driver failure

I am having 100% failure rate trying to get this high side driver to operate. The failure happens as soon as the 5v logic signal is turned on. I have had straight shorts from VDD to GND, and I have ...
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3answers
74 views

High side Mosfet switch leakage issue?

Wasn't sure how to headline this but here it is: I'm debugging one of my coin cell ON/OFF switch. Circuit is as follows: simulate this circuit – Schematic created using CircuitLab Basically a ...
1
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1answer
85 views

High voltage and current

I have a DC motor that needs and works nearly 400v and 20A. I chose FDL100N50 for n-channel mosfet also IXTK40P50P for p-channel mosfet. I connect a 4n35 optocupler for output of every mosfet. Are ...
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2answers
142 views

How to remove leakage current from nRES transistor switch?

I have this AVR reset pin design, which provide a 12V into the nRESET pin of an ATtiny μC. It's function can be describes as follows. (a) An input signal given by a "low" (0) on ...
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1answer
64 views

Circuit protection problem driving high side MOSFET continuously

I need to drive a high side N-channel IGBT continuously. The circuit is essentially a passthrough, and the only thing I want to do is turn this pass through line on or off (usually if not always on) ...
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0answers
69 views

High voltage switching using N-FET

This is my first time designing a High voltage switch, as come up with some interesting thing that I want to ask about. My application needs to short out a signal line to HIGH, with a 3v3 signal from ...
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3answers
147 views

Can I drive a high-side N-channel MOSFET with NPN transistor and extra battery? (H-bridge)

I read discussions about only using N-channel MOSFETS in h-bridge circuits. I often see things like optoisolators listed. Example: driving high-side N-channel MOSFETs in H-Bridge But why can't I just ...
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2answers
66 views

P-Mos switch high side

I'm trying to switch P-Mos given that: Vcc > Vgs max Enable_output is 0V or 3V I'm switching both GND and VCC on purpose. 4. 8.4VR at 2uA ! The questions: When Q2 is off, what is Vgs at Qsp1? Is ...
2
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1answer
433 views

Turn on a microcontroller using a high-side Mosfet switch

I am using a P-Channel Mosfet to control the power of an STM32F103VETE ARM microcontroller (MCU1). The source of the Mosfet is connected to 3.3 V and the drain goes to the MCU1 Vdd pins. The gate of ...
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2answers
207 views

High side MOSFET problem

I have built a high side MOSFET driver and hooked it to an atmega328p. Having an issue with the setup, the MOSFET is not switching on completely due to the low Vgs. For this circuit the expected Vgs ...
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0answers
128 views

How to isolate a RLC circuit with MOSFET switches?

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 ...
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1answer
57 views

High side driver internal design

I have a question about the high side driver VN7016AJ for automotive applications, during ISO pulse1 -150 V will be applied at its VCC pin, I found from the User manual (UM1922) that when -150 V is ...
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2answers
960 views

How to drive p-channel MOSFET

I need a high side switch. I thought about using a p-channel MOSFET. The source will be connected to around 50V-60V. How can I drive this MOSFET? I can't find a driver which can switch between 60V and ...
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1answer
72 views

2 x 2 n-channel mosfets in series: does my circuit has any flaws?

For a hobby project I would like to switch between two power supplys. The load are two motors which can also be switched on and off separatly. The two motors are BLDC controllers in reality. I am only ...
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0answers
127 views

Inverter Design - High Side MOSFET - Slow Switch Time

I've posted previously on a similar issue which can be found here Overview: My design is a 3 phase inverter with: MOSFETS are STF10N60DM2 Gate Driver is 6EDL04N06PT I'm using only a single high ...
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3answers
135 views

Current sensing on negative 1.1kV DC rail

I searching for a way to do high side current sensing on a -1100V DC rail. My HV is generated from the hamamatsu C9619 High voltage power supply module and it powers the hamamatsu R647P ...
3
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2answers
122 views

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 ...
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1answer
43 views

HO defaults “On” on high side/low side driver

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 ...
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1answer
90 views

High-side switch with BJT for 24V controlled by logic level

Earlier I have asked another question and I got very good answers but I couldn't get a solid success as per my size considerations and an unexpected solenoid type change. And I am now giving another ...
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2answers
529 views

High-side switch for 24V controlled by logic level

I mainly use this high-side switch design for 5V and with low current loads (under 100mA). Based on the VDSS (-50V), I thought I could energize this design with 24V as well. Apparently, I am making a ...
2
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0answers
140 views

High voltage 1100 V current sense on the high side

I have the circuit that you see below. My load is a photomultiplier tube equivalent to a 3.63Mohm resistor. My power supply can deliver max 4W (2kV and 2mA). I use it on 1100V and the load draws ~...
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1answer
79 views

What is a (side) current alarm?

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 ...
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1answer
188 views

Can I drive a Low-Side MOSFET from a High-Side Driver?

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 ...
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2answers
182 views

Mosfet's Vgs and rds

If I use n-channel MOSFET (IRF3205) for high side switch, I need a gate driver for that MOSFET to turn on. For high switch the mosfets gate require higher voltage than it vcc. I have to switch 50 ...
3
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3answers
596 views

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 ...
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1answer
136 views

High-side gate driver not working under load high current

I have been trying to implement a current limiting circuit using a high power NMOS and high side gate driver. My idea is to adjust the PWM duty-cycle of the gate driver to give an limited (average) ...
1
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1answer
100 views

IR2133 Bridge driver not working as expected

I want to use the IR2133 to drive a mosfet rectifier. I have setup as in the circuit below The probelm is (take first high side fet as example) that the signal that appears on HO1 is exactly the same ...
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1answer
200 views

high side vs low side current sensing in isolated bench power supplies, does it matter?

I'm trying to make a couple of mains isolated, transformer based, bench power supplies. Considering that the current sense resistor will be in the PSU box and external loads will not have access to ...