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Depends on how fast you pulse it and how much current you are driving. I would suggest using a scope to find a good value where you don't have a lot of overshoot but still good capacitance.
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ArcticMyst Security by Avery
LM317 based driver for 1W 445
- Thread starter Devilz Rej3ct
- Start date
Depends on how fast you pulse it and how much current you are driving. I would suggest using a scope to find a good value where you don't have a lot of overshoot but still good capacitance.
HIMNL9
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Well, 47uF fails the PWM supply as "pulses" also if they are just 100Hz or few more.
If you want a fast pulsed system, place only a 10nF cap, in parallel to the LD.
Also, wires shorts as possible, and with decent section, and a "fast" diode in antiparallel with the LD (an 1N4148 must be enough, but if you want to be super-paranoid, use a Schottky diode).
And again, place a BIG capacitor (2200uF or similar) BEFORE the regulator, in parallel with the 100nF one (this take care of a bit of the current needs), or also better, an LC group.
If you want a fast pulsed system, place only a 10nF cap, in parallel to the LD.
Also, wires shorts as possible, and with decent section, and a "fast" diode in antiparallel with the LD (an 1N4148 must be enough, but if you want to be super-paranoid, use a Schottky diode).
And again, place a BIG capacitor (2200uF or similar) BEFORE the regulator, in parallel with the 100nF one (this take care of a bit of the current needs), or also better, an LC group.
