Text preview for : TestingLEDs_w2600B_AppNote.pdf part of Keithley TestingLEDs w2600B AppNote Keithley 2600 TestingLEDs_w2600B_AppNote.pdf
Back to : TestingLEDs_w2600B_AppNot | Home
Number 3212
A Tektronix Company
Application Note Avoiding Inrush Current when Testing High
Series Power LEDs with Series 2260B Power Supplies
Light-emitting diodes (LEDs) are quickly becoming an attractive the device is instantaneously a short circuit when a voltage is
lighting source due to a variety of benefits they offer over the applied across the device's terminals. The instantaneous short
traditional incandescent and fluorescent light bulbs. LEDs circuit results in an inrush current , a short duration, startup
have a very long lifespan; they are highly efficient with very current that is a much greater magnitude than the LED's steady
low power consumption; they do not contain mercury and are state operating current. For
environmentally friendly. example, introducing an LED to an
+
Unlike an incandescent bulb where the lighting source is energized circuit or "hot switching"
Power
a filament made of a resistor that lights up when heated, an the LED will lead to dangerous Supply
LED
LED is a two-terminal, semiconductor device that emits visible inrush current magnitudes. The