When you put diodes in parallel, you must put a low value resistor in series with each diode so that they can share the current. Diodes don't always conduct at the exact same voltage. The resistors allow a slight bit of voltage drop on each diode.
Hi,
The ressistor has not to be necessary...with rising current through a diode the forward voltage will rise too, so the parallel diode takes more of the current.
If the diodes are the same type it should generally work...how ever I would not double the maximum current ability with two diodes...would recommend a 1,5x max
The ressistor has not to be necessary...with rising current through a diode the forward voltage will rise too, so the parallel diode takes more of the current.
If the diodes are the same type it should generally work...how ever I would not double the maximum current ability with two diodes...would recommend a 1,5x max
Hi,
The problem is forward voltage drops with temperature
so you cannot rely on diodes to reliably share current,
one diode can current hog, so no resistor is wrong.
Bigger diodes as a replacement is the proper way to do it.
rgds, sreten.
The problem is forward voltage drops with temperature
so you cannot rely on diodes to reliably share current,
one diode can current hog, so no resistor is wrong.
Bigger diodes as a replacement is the proper way to do it.
rgds, sreten.
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I agree with you sreten. My reply was in response to the OP question.
It's really not a good idea to parallel diodes. Even if you can balance the current through the multiple diodes, the necessary resistors will cause a sag in the voltage as the current increases.
It's really not a good idea to parallel diodes. Even if you can balance the current through the multiple diodes, the necessary resistors will cause a sag in the voltage as the current increases.
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