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Old 06-10-2010, 09:48 AM #1
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Question soft start lab driver + TTL for 445nm

I am curious if anyone knows of a good quality soft start driver for these new 445nm diodes.
Any recommendations?


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Old 06-10-2010, 10:11 AM #2
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Default Re: soft start lab driver + TTL for 445nm

Yoou could custom-build a DDL based driver if size isn't a problem. Why do you need soft-start? How long do you need it to take when starting up?
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Old 06-10-2010, 10:22 AM #3
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Default Re: soft start lab driver + TTL for 445nm

Put about 3F of capacitance across the diode. That's good for a soft start and soft stop. It will be a 1-2 second delay, but its really nothing more than a cool affect.
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Old 06-10-2010, 10:45 AM #4
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Default Re: soft start lab driver + TTL for 445nm

Soft start should not be neede do you know these diodes are pulsed at 700ma so being that they are regulary turned on and off rapidly why do you think you need soft start ?
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Old 06-10-2010, 11:01 AM #5
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Default Re: soft start lab driver + TTL for 445nm

Ok, then I guess these will be fine for instant on. I just have had some nasty blowouts due to instant 100% on some 405nm diodes. That's my concern.
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Old 06-10-2010, 11:14 AM #6
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Default Re: soft start lab driver + TTL for 445nm

Flexdrives have a current ramp up when turned on
It used to be a noticeable delay but in the newer revisions the ramp up happens faster.
Unless he took it out these days? I dunno. Haven't had one in a while
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Old 06-20-2010, 05:34 PM #7
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Default Re: soft start lab driver + TTL for 445nm

bump

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Old 06-20-2010, 08:49 PM #8
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Default Re: soft start lab driver + TTL for 445nm

This may be a good idea, I remember reading something about these diodes being warmed up. IIRC there is a point in the projectors startup that the diode is held at threshold current for a few seconds.

I think I saw this on PL, but the threads are gone for now.
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Old 06-20-2010, 11:31 PM #9
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Default Re: soft start lab driver + TTL for 445nm

Do flexmods have the same soft start as the flexdrives?
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Old 06-21-2010, 12:51 AM #10
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Default Re: soft start lab driver + TTL for 445nm

I don't believe so. The flexmod is linear, not switching. So a ramp up feature would be much more difficult to achieve with such a small size. It is also modulation controlled. That's a good clue that says it is more of an "instant" on/off.
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