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I see, thank you for your suggestion.
Here is my switching regulator schematics:
I saw this article (link below) about ground moating topic. Design guide#2 mentions that it's rare where you need to moat which is similar to what you were saying...
I have a DC-DC switching regulator that operates at switching frequency of 260Khz. It steps down a 28vdc to 3.3Vdc.
On the same PCB I have a microcontroller and would like to have it's ground plane to be as clean as it can be from any switching regulator noise .
Will a ground moat around the...
This chip is a dedicated touch sensor IC with the processing algorithm built in. The chip itself works flawlessly. My concern is the system as a whole as in safety/reliability.
Thanks for the reply.
The user touches the S terminal loop ( Buttom Round Pad on the PCB Layout) which causes U2 to sends a high signal (5v) on the 'out' netlabel.
Resistor R10 is just a place holder no component is soldered there.
When 'OUT netlabel' is high it turns on Mosfet Q1A which pulls...
Hello,
I have built a High side switch that interfaces with a low voltage relay system
for home use( existing product) and I am looking for feedback to make the switch safer and more reliable.
The touch switch that I have built connects to the low voltage relay panel via 3 wires.( Please see...
Thank you for your replies. These waveform are measured with a snubber across the diode DS2. R= 45ohms & C= 220Pf in series
Here is the resulting waveform before and after the snubber was added (measured across DS2).I will try adding the 1nF at the input and output and see how that goes.
I have a switching regulator that operates at switching frequency of 260Khz that steps down a 28vdc to 3.3Vdc. The switching regulator output will supply current as high as 1 amp for the initial 5 minutes on power up then it falls off to several mAs.
Can you please suggest an input and output...
I have made an update to the circuit protection.
I don't think that zener diode is needed since the voltage regulator will clamp voltages at its output tp 2.5v and since it can source current level up to 150mA therefore it can handle incoming current up to 250mA.
A better place is maybe to...
Thanks again klaus, ESD pulses last in several nano seconds peak. I am inclined to remove cap c2 and c3 because the active low pulse that I am sending is 50us wide and that is feeding into the microcontroller interrupt input pin. What do you think?
I would rather keep the resistor then at 1k...
Thank you for your reply.
Do you suggest removing the cap c2 and c3? or lowering the inline resistor to maybe 100 ohms to reduce the delay?
But that will limit protection from ESD current. The TVS clamps to 16.8v
The microcontroller is low power and absolute max input is 2.8v and 4v
Supply to...
Klaus,
Thank you for your feedback. I have implemented your suggestion in the circuit below. Please comment with suggestions or possible improvement.
To give a brief overview. There are 2 circuits one on each PCB seperated by 7 feet wire.
The one on PCB1 sends a communications signal( active...
I have been looking for a level 4 ESD pin protection on microcontroller pin( pic16f1503).
The micro digital input pin is used to measure pulses between 50us to 200us.
Do you think a circuit like this would work?
R=500 ohms and
C=0.01uF
VESD=V0=15kv ( Level 4)
Vc=V0(1-e^(-t/RC))...
No one has experienced this issue before on the 16F1503?
I usually have no issue in generating PWM, but this chip is giving me trouble.
I have followed the instructions in section" 22.1.9 SETUP FOR PWM OPERATION" one by one. Are there anything else that I need to set beside the instructions on...
I am trying to send a PWM signal on PortC5 (PWM1) using the latest CCS compiler(5.026).
This is the manual method of sending a PWM and it doesn't seem to be working.
I have followed the PWM Setup and generation on page 221 of PIC16f1503 datasheet. I just couldn't get it to work. Anyone have...
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