Questions tagged [failure]
The failure tag has no summary.
200 questions
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Full H bridge Power amplifier failure at higher voltages
I have designed a 4 channel full bridge power amplifier in a PCB using IR2110 driver and FCPF400N80Z MOSFETs. I am applying 200 V to MOSFETs. All 4 channels are exact replicas of each other. 3 of my ...
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How to use the military handbook for reliability prediction of electronic equipment
I want to predict the reliability of the components for which I am using the Military Handbook — Reliability Prediction of Electronic Equipment (MIL-HDBK-217F, 1991, Department of Defense). Is there ...
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Root cause for failed UART interface on SBC
I could use some help troubleshooting an SBC (KSTR-SAMA5D27) that will no longer communicate via some of its UART pins and what could be root cause, so I can prevent future failures.
As part of a ...
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What determines the resistance with which MOSFETs fail short?
In the case of electrical or thermal overload, MOSFETs usually fail short with a relatively low resistance in the range of ohms or tens of ohms. This answer on "Do MOSFETs usually burn open or ...
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Why did this simple lead-acid battery charger fail?
The following schematic shows the simple circuit of an LED lantern. One day somebody connects it to the mains supply in order to recharge the battery after several months, but hears a loud sound!
The ...
- 1,146
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N-MOS failing short on my PCB
I'm currently testing a PCB I designed. One of the MOSFETs, Q5, failed yesterday for the 3rd time, and I haven't managed yet to find out why.
Main facts:
N-channel MOSFET: CSD19538Q2T
Rated (never ...
- 9,678
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2
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Why is the Relay "Chattering"?
I have this circuit which measures if there is under/over voltage from the AC mains voltage and it consist of two parts:
Part one: measuring the input voltage (I had it cropped because it is not the ...
3
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Resistors lose resistance after a while
I have 3 different batch of resistors (10k 0805 SMD) which all fail the same way. I am supplying 5V across the resistor, with an ammeter connected in series. For the first hour or so everything go as ...
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MOSFET keeps detonating
I am building a power switch for rocketry usage. On the outside of the rocket is what we call a screw switch. I am not comfortable with all the current running through the screw switch, so I built a ...
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TI synchronous buck converter went up in smoke, where do i start?
I’m using a TPSM63606RDLR power module device. Everything looked perfect for multiple days, but yesterday it started smoking. I did move the PCB and there are some LED strips connected externally to ...
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PCBA corrosion voltage dependence
Let’s say a PCBA is located in a humid environment where condensation can occur in a worst-case scenario. Parts of the PCBA are low voltage circuitry and parts are high voltage, let’s say we have 3.3V ...
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Stepper Motor Z Axis Dropping
I have a current setup of a rack and pinion with a stepper motor moving a stage up and down the rack and pinion. I have encountered an issue with my stepper motor where when moving vertically in the Z-...
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2
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ESP32 TWAI/CANBus bus errors cause bus off state
I have multiple devices using ESP32-WROOM-32E and TWAI (CAN). There was an issue where they would have bus errors and then fail to recover via twai_initiate_recovery(). I solved the recovery issue by ...
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What is causing the digital output of my MEMS pressure sensor to decrement continuously?
I'm a lowly mechanical engineer so bear with me. This problem has been the bane of my existence.
I'm using a temperature-compensated barometric pressure sensor in a fluid-contacting application. ...
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8
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Detecting stalled AC fan in high-temperature system
The problem: AC 230 VAC fans in a system rated to 100 °C need to be monitored for failure.
There is no third wire, just the L and N leads.
None of the potential solutions seem good. For example:
...
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