Load open circuit indication circuit
Source: InternetPublisher:公子李 Keywords: BSP voltage drop light emitting diode Updated: 2021/05/22
It can be used to indicate open circuit or burnout of loads (such as lamps, electric heaters,
contactor coils, etc.). The selection of the resistor Rz should ensure that the voltage drop UR
on it is not greater than
the forward voltage drop of the light-emitting diode VL, which is calculated according to the following formula:
%z-[, blue (n)
R2-.
In the formula, UF- light-emitting diode forward voltage drop (usually 1.7-2V), V;
IF- light-emitting diode operating current (usually about 10mA), A.
U.R. Generally, 3~4V is acceptable.
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