Old 08-19-2016, 10:00 AM #1
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Default M140: Pulsed or constant current ? which is the best pulse frequency ?

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 by equal; 08-19-2016 at 10:17 AM.
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Old 08-19-2016, 03:48 PM #2
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Default Re: M140: Pulsed or constant current ? which is the best pulse frequency ?

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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