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the purpose of MAX5993 is to handle these plug/unplug events, even so, I don't understand how the diode can help. At first, I thought it for reverse polarity protection, but for this purpose, the diode should be place on VCC pin, not the GND
Hi all
please look at the attached circuit, it is designed by our former power-supply designer engineer
this is hot-swap controller MAX5993A for 48V
there is a D11, a schottky diode, connected to GND, that I don't understand it's purpose. What it used for?
Hi all
I need a simple design for counter,
there is an input trigger pin
when trigger is going from low to high, the output should be "1" for 10 seconds,
if another trigger appears in these 10 seconds, the output should start counting 10 second again,still holding the "1" at output
for example...
attached a picture of the power supply
I don't know the reason why the "-" connected to chassis, it is off-the-shelf power supply unit, and it has passed all safety tests and has UL certification, so I don't worry about it.
The C5 capacitor never blow up, but if it has to do with transients...
Hi all,
attached a schematics for an input EMI filter for DC-DC PSU
the input voltage is 48V from external power supply
output is 5V 30A
DC_IN_POS is the +48V input
DC_IN_NEG is the 48V return
the chassis ground (the one between RFI_CONTACT1 and RFI_CONTACT2) is connected to DC_IN_NEG in the...
what are the safety hazards? the secondary voltage is less than 60V, so it's not a "dangerous" voltage.
also, what does it mean "ground separation" between primary and secondary? there is no ground in the primary, because it is AC. or maybe i'm wrong, and the "earth" is the AC's ground?
please look at the attached picture
this is our custom power supply in metal enclosure
i'm performing now tests for IEC60950 safety standards
the "-" of the DC output is connected to system's protective "earth" connection (don't know why) - marked red
can this cause fault in safety tests?
and...
Please look at the attached file
page 6
there is a simulation of single data lane
1) why the impedance is not equal on the whole way? shouldn't it be equal? wouldn't it cause reflections?
2) why the trace lengths are not the same for top & bottom? there is 24 mil difference between them...
impedance calculation
I have 6-layers stackup:
-----SIGNAL
-----GND
-----SIGNAL
-----SIGNAL
-----VCC
-----SIGNAL
the board is for PCI express cards, with differential lines, that must be impedance controlled to 100 Ohm differential.
For top layer and layer 3, the reference layer is the GND...
bernoulli binary generator+matlab
I guess you want to use scope/spectrum to observe the data? you should unbeffer the data.
use "unbuffer" block before scope/spectrum
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