LifecyclePhase:

Revision

: 1

Expired Period: Forever

Release Date:2009-05-13 20:07:53.0

Technical Data Sheet

204-15/T1C3-4QSA

Everlight Electronics Co., Ltd.

http\\:www.everlight.com

Rev

1

Page: 11 of 12

Device Number: DLE-0001425

Established date:05-12-2009

Established by: Ruby Lin

5. Circuit Protection



Below the zener reference voltage Vz, all the current flows through LED and as the voltage

rises to Vz, the zener diode “breakdown." If the voltage tries to rise above Vz current flows

through the zener branch to keep the voltage at exactly Vz.



When the LED is connected using serial circuit, if either piece of LED is no light up but

current can’t flow through causing others to light down. In new design, the LED is parallel

with zener diode. if either piece of LED is no light up but current can flow through causing

others to light up.

6. Heat Management



Heat management of LEDs must be taken into consideration during the design stage of LED

application. The current should be de-rated appropriately by referring to the de-rating curve

found in each product specification.



The temperature surrounding the LED in the application should be controlled. Please refer to

the data sheet de-rating curve.