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What you call "shielding" may in fact be unacceptable clock branch loading. Cut radiated emissions but push more current spikes into the power/gnd planes (or more likely, the spindly little busses you see in Big Digital cell libraries). Maybe you'd be better off routing complementary clock pair and criss-cross it every so often so that "far" fiel
I created PWM signal in dsPIC30F3011 and i am getting these waveforms . There are spikes during off period of value around 1 volt. So is that a problem?? Because i am going to connect this to a buck converter. So if both high side and low side PWM turned on at the same time it will blow the devices. So i just want to confirm this spikes won't crea
1-2A peak gate current spikes are normal for power MOSFET drivers (sometimes more, for fat FETs). The Qgg displacement charge has to go somewhere, out the drain, source or both. 'Scope photo is not informative, about what's what. Seems like if you're designing it you ought to be able to tell where the current is from and to, and determine wheth
Basically yes, they are an epoxy coated combination of capacitor and ferrite beads (inductors) for supressing RF interference. To DC they usually appear as a short circuit. In the photo I would guess they block interference entering or leaving the board and the red discs are to absorb excess voltage spikes. Check with Murata, they are one of the
Hello everyone, I have an arduino and a voltage divider as reference of 60mV. 100K connected to 5V and 1.2K connected to the ground. And it has nice (approx)60mV. But as soon as I connect this led driver, the reference voltage get strange spikes. Even no led is lit as no command was sent from
LCR meter are not designed to measure in circuit. It may be possible under specific circumstances, but it needs good understanding of electronic circuits and instrument parameters to decide where it's the case. I noticed very huge spikes in the output of my voltage regulator (Should be 3.3 V but if I put the plug of the power suppl
Although there may be a lack of decoupling capacitors, the problem discussed in the original post is unlikely related to it. Referring to the original question, I don't exactly understand what's your problem with "spikes" seen in unconnected/unterminated RS-232 cable. As said it's just normal operation. Standard RS-232 cables have 9 wires wi
Hello I am working on 3 phase motor control by V/F control. my circuit consist microcontroller > IR2110> IRF640. Pwm freqency is 1KHZ Design is non isolated my problem that while MOSFET switch on and switch off it create posivite and negative spikes upto +/- 25volts resultant +5v and +15 for microcontroller and ir2110 contant spikes or trans
i need some device that will convert the 150V pulse to between 5V-3.3V. the device needs to be fast. Fast? Is this a jet engine with spark plugs and CDI? Use a resistive divider or for better safety, use a resistor and Zener diode. The diode will protect against reverse voltage spikes (Zeners work like ordinary diodes in
The step-up transformer is ideal if we want ease and simple construction. Use an H-bridge to apply true AC 50Hz square waves. Shape them into a sine by installing a series capacitor. Thus you reduce problematic spikes which tend to happen when switching inductors. This is a basic schematic showing
The configuration should work well. Expect that the MCU ADC is injection small current spikes into the circuit when measuring, but probably no above a several mV level. You may want to place a filter capacitor (100 nF to 1 uF) across R95. By the way, as you mention fail-safe hardware design. The MCU could reprogram the ADC input into an output p
Well, depending on what you know about the grid, and your ability to limit / filter any upside excursions (like is it a small generator driven grid with occasional load-dump spikes, surges, ...) you might define your "380VAC" more conservatively, and this might make a derating exercise pick 1000V rather than 600V FETs. And like that. What you thin
The peak current is only 2mA if there are no voltage spikes on the AC. Voltage spikes will also arc across a little resistor that has a 250V absolute maximum voltage rating causing very high current in the LED. I think you should rectify the AC, it feeds a series resistor with a capacitor to ground as a filter then another series resistor to feed
Such issues hard to figure out even with real time debugging. It can be everything. Stack overflow or h/w voltage spikes.
Hi, I assume high voltage spikes cause the fail. (Caused by wiring and stray inductance) Therefore we need to see your PCB layout. GND plane. Urgent for high speed high current switching. And there is no capacitor at 12V line. You need at least one low ESR bulk capacitor and I recommend an additional fast capacitor at each MOSFET_source. What s
do i need anything else or this circuit will work fine bcoz i have read fan acts like relay with turned off as its is inductive load. will the fan affects battery. Circuit is in pic. The attached pic is, for all practical purposes, useless. But first we need more information about the fan. Is it a small instrument
Glad to know that it the UPS is back to normal. Lightning can cause voltage spikes that can couple to the control microprocessor and can shutdown the UPS. I cannot explore all possible scenarios.
The 7812 regulator has a max Vin of 35V. If you get spikes just below this voltage you could drive it into malfunction, especially without any kind of capacitors to stabilize it.
Hi I'm doing a equipment integrated testing.. It has got two PCBs . Equipment has a 12V battery and One AC /DC supply generating 15V from mains, both are ORed and given to one board which generates 10V using buck and gives to other board. Both the boards has got some microcontrollers and generates lower core voltages required for their operation
Most of your problems can be understood with Ohm's Law and resistive dividers. 1) 0.2 / 15 V = 1.33% load regulation ...not bad which is the similar to the ratio of your output impedance in your SMPS relative to the load. Zout/20Ω= 1.33% , Zout= 267 mΩ. can easily be reduced by choice of FET or IC. 2) The spikes can be probe ground i