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M140: Pulsed or constant current ? which is the best pulse frequency ?

equal

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Oct 8, 2015
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hi,

what is the best use with a nichia M140 diode - pulsed or constant ?

if pulsed, which frequency is recommended ? Signal type ? (Rectangular or Sinus pulse)
in the datasheet i can not find a pulse width value.



the same question for a NDV4542
this is a 100mW 405nm laserdiode
CW = max 200mW
pulse = max 400mW

here i have found a pulsewidth 30ns (WOW 33,3MHz ???) , but which signal type ?

can i increase the lifetime, if i adjust the output to 200mW pulsed ?

thanks to this great community
 
Last edited:



Cyparagon

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Sep 12, 2007
Messages
9,785
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Don't bother with pulsed operation. The max output can be higher, but the average output cannot. Constant wave is far simpler to implement anyway. The datasheet should have a maximum operating current listed somewhere. Find or design a constant current driver for that value... perhaps slightly above this value if you're feeling adventurous.
 




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