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Old 07-14-2010, 05:44 PM #161
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Default Re: Drivers for 445

Quote:
Originally Posted by jib77 View Post
Has anyone used a LD1085V from ST Micro as a basis for a DDL driver? Just curious because we are using it in a prototype board at work to drive a power hungry RF amp. I might have a spare or two to try it out.

Output: 1.25 to 28V @ 3A
Dropout voltage: 1.3V @ 3A

Datasheet
I think yes ..... i never tried it, cause here is difficult to find, and the price is too high, but, looking at the internal schematic (the part that i have marked, being precise), you can see that the differential configuration of the ADJ pin is not referred directly to any ground plane, only to the output line, that is basically the same configuration that is used for the LM317 series, so probably is possible to use it with the same type of circuit .....

Only, remember that, at these currents, you need to dimension the set resistor for them ..... like, around 3A, you will probably need a 5W ceramic resistor, for not kill it ..... (and, for sure, no trimmers allowed )
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Old 07-14-2010, 07:23 PM #162
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Default Re: Drivers for 445

Can the flexdrive actually provide 1.5A at 5V on the output? Because the datasheet says no, but that doesn't mean that it can't.
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Old 07-14-2010, 10:28 PM #163
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Default Re: Drivers for 445

My V5 is maxed out
1.5 amps
4.35 volts
>1.5 watts
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Old 07-15-2010, 01:07 AM #164
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Default Re: Drivers for 445

Looks like I'm sold on the flexdrive. Microboost has more neat features, but I don't really think I'd use 'em. I'd get too ambitious trying to hack a 3-mode LED "driver" to drive the TTL input or something crazy like that when I might could just use a switch and a resistor to have high and low(er) modes
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Old 07-15-2010, 10:50 AM #165
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Exclamation Re: Drivers for 445

Quote:
Originally Posted by BShanahan14rulz View Post
Can the flexdrive actually provide 1.5A at 5V on the output? Because the datasheet says no, but that doesn't mean that it can't.
Uhm, as far as i remember, is matter of total efficency, and this vary with the input voltage, output voltage, and load current ..... i'm not 100% sure, but i think that the safe working range for a flexdrive that feed a load of 5V, with an input voltage of 3,7V, may be around 600 / 700mA ..... over this, maybe it still work, but i don't bet about the stability, survival, or diode safety .....
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Old 07-19-2010, 04:57 PM #166
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Default Re: Drivers for 445

So what type of wires are you guys using for a full power flexdrive and a 445?

Will the wires from my i7 heatsink fan be large enough? Seems like the largest wire I can fit in there but motor rating is .30 A @ 12V . . .
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Old 07-19-2010, 05:13 PM #167
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Default Re: Drivers for 445

Quote:
Originally Posted by boscoj View Post
So what type of wires are you guys using for a full power flexdrive and a 445?

Will the wires from my i7 heatsink fan be large enough? Seems like the largest wire I can fit in there but motor rating is .30 A @ 12V . . .
you are running a low duty cycle so you should be ok.


American Wire Gauge table and AWG Electrical Current Load Limits with skin depth frequencies Should be accurate for non mil spec




I think I used 22awg mil spec wire it was the biggest I could fit and it was rated for over an amp
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Old 07-19-2010, 05:18 PM #168
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Default Re: Drivers for 445

finally found my magnifying glass and it says AWG 26 . . .

found some 20 ga . . . that would probably be better . . .

Last edited by boscoj; 07-19-2010 at 05:23 PM.
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Old 07-19-2010, 10:05 PM #169
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Default Re: Drivers for 445

I want to build a 445 in a handheld host with 2+ power options so I could have a "safer" power as well as a high power. In trying to design this, I thought of multimode flashlight LED drivers... might this one work?

3-Mode Perfect Regulated Circuit Board for Cree XP-G, XR-E, XP-E and SSC P4

Thanks,
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Old 07-20-2010, 12:18 AM #170
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Default Re: Drivers for 445

did you see in "General" these Crees I found @ Costco today? $16.99 for three and the switch has a 100% and 50% setting . . .



Quote:
Originally Posted by awlego View Post
I want to build a 445 in a handheld host with 2+ power options so I could have a "safer" power as well as a high power. In trying to design this, I thought of multimode flashlight LED drivers... might this one work?

3-Mode Perfect Regulated Circuit Board for Cree XP-G, XR-E, XP-E and SSC P4

Thanks,
Alex
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Old 07-20-2010, 12:22 AM #171
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Default Re: Drivers for 445

Most modes are achieved using PWM. If using a simple linear reg with a set resistor, just use two different resistors.
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Old 07-20-2010, 12:30 AM #172
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Default Re: Drivers for 445

most modes for these Cree lights? hmm that wouldn't work I'm guessing?

should be an easy hack to disable I'm thinking???

Quote:
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Most modes are achieved using PWM. If using a simple linear reg with a set resistor, just use two different resistors.
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Old 07-20-2010, 01:41 AM #173
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Default Re: Drivers for 445

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Originally Posted by boscoj View Post
most modes for these Cree lights? hmm that wouldn't work I'm guessing?

should be an easy hack to disable I'm thinking???
most <100% modes for LED flashlights use PWM. but thats handled with the driver in them. you might be able to use those as hosts for LD. maybe.
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Old 09-26-2010, 11:53 AM #174
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Default Re: Drivers for 445

Hey guys. I am new in laserpointerforums and I am building a 445nm laser. Can you please tell me if I can use a jayrob flashlights build in driver (I think its about 900ma) to power my laser diode without a flexdrive or microboost driver???
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Old 09-26-2010, 12:29 PM #175
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Default Re: Drivers for 445

what kit are you using? as long as the stock driver isn't boost driver or the host uses just 1 lithium battery it won't be able to deliver enough current into LD (LD needs >5V, but battery is only 3.7)
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Old 09-26-2010, 04:33 PM #176
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Default Re: Drivers for 445

The drivers in Jayrob kits are flexdrive or microboost, which ever you want. Although the flexdrive may be out of stock for now. Lucky for you both can be used for 445.

If you are talking about the LED driver that comes with the host, they are usually not well protected against current spikes and can kill your diode.

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Hey guys. I am new in laserpointerforums and I am building a 445nm laser. Can you please tell me if I can use a jayrob flashlights build in driver (I think its about 900ma) to power my laser diode without a flexdrive or microboost driver???
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50mW O-Like New Pocket Greenie OLCGL50

100mW+ PHR/MicroBoost V1/Jayrob Chrome Pocket Mini (140mA)
445nm, Flexdrive V5, Ehgemus 18650 Polished Host (Murdered )
445nm, JibDrive 1.2A, Ehgemus 1x26650 Alien Host
LCC Red 200mW in Custom Ehgemus CR123A Host

FS - My cheap LM1117 driver: >>LINK<<

Cheap PCB prototypes: >>LINK<<


レイセーたちはすごいですよ。

Last edited by jib77; 09-26-2010 at 04:36 PM.
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