Ordinary light-emitting diode forward voltage drop of saturated 1.6 ~ 2.1 V, forward current of 5 ~ 20 mA. LED main parameters:
1) Absolute Maximum Ratings
(1) allow power Pm: to allow the addition to the DC voltage across the LED forward current flowing through it the product of the maximum . Than this value, LED heat, damage.
(2) Maximum forward DC current IFm: increase the maximum permitted positive DC current, more than this value can damage the diode.
(3) The maximum reverse voltage URm: increase the maximum allowed reverse voltage exceeds this value, breakdown of light-emitting diodes may be damaged.
(4) work environment ,. : Light-emitting diodes with a working temperature range, below or above this temperature range, light-emitting diodes will not work, efficiency is greatly reduced.
2) electrical parameters
(1) forward current If: is the normal light-emitting diode when forward current values. In actual use should be selected If the 0.6 - IFm below.
(2) forward voltage UF: UF-emitting diode forward voltage at 1.4 ~ 3 V. When the outside temperature, UF will decline.
(3) UI features: light-emitting diode voltage and
58 datasheet and current.
in forward voltage is less than a certain value (threshold), the current is very small, non-luminous. When the voltage exceeds a certain value, the rapid increase in forward current with voltage, then light. UJ curve can be drawn from the LEDs forward voltage, reverse current and
58 price and reverse voltage and
58 suppliers and other parameters. Positive LED reverse leakage current IR
general LED current in mA to a few dozen mA, and low current LED operating current below 2mA (normal LED brightness and the same).
as light-emitting diode has a maximum forward current IFm, the maximum reverse voltage URm limitations, when used, should ensure that no more than this value. For safety reasons, the actual current IF in 0.61Fm the following imaginary; should make possible the reverse voltage UR