Raptor Flip-Top VV Mod with 20A, 120W dc/dc converter...

Matt Collins · May 5, 2014

The other option would be this http://www.e-cigarette-forum.com/forum/showthread.php?t=558902

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Matt Collins · May 5, 2014

Parts should be available

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Joshleeman · May 13, 2014

mamu said:
yeah - no stealth size mod with this board for sure.

CraigHB had mentioned the LG 18650 batts and that's how I found out about them. He didn't know though if they were accurate as spec'd, so I wanted to see and test them.

LG 18650 batts: LG LGDAHE21865 3.6V 30A HIGH DRAIN 2500mAh Lithium ion Li-on

and here: 2pcs LG LGDAHE21865 HIGH DRAIN 2500mAh 30A 3.6V Lithium ion Li-on 18650 Battery

I ordered 2 from the ebay seller - I've bought from him before and no issues there.

Specs:
LG LGDAHE21865 HIGH DRAIN 2500mAh 30A Rechargeable Lithium Li-on 18650 Battery

Description:
· Li-ion 2500mAh 18650 cell
· Product Name : LG LGDAHE21865 Lithium-ion Rechargeable Battery
· Model : 18650
· Nominal Capacity : 2500mAh
· Diameter : 18.0mm
· Height : 65.0mm
· Weight(Typical) : 45g
· Max. Continuing Charge Current : 30A
· Internal resistance : 13mOhm
· Charge Method: Constant Current and Constant Voltage(4.2V)
· Nominal Voltage : 3.7 V
· Discharge Temperature : -20°C ~ +60°C

Probably wouldnt matter because theres no way this device would produce a hit anywhere near small enough to qualify as stealth. This chip is in the nite club fog machine category.

T1lVl · May 13, 2014

Anyone know where we can score some chips?

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Covert · May 13, 2014

Have one on the way had to do some digging to find it though lol. Thank you yet again Mamu for all your work, diagrams, and parts lists. Hopefully I can get it up and running soon

T1lVl · May 13, 2014

Could you pm me the details? I would really like to build my own.

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Covert · May 14, 2014

Just PMed yah I traded for mine lol. I really needed to build something again. The dna 30 just didn't do it for me like this does.

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T1lVl · May 14, 2014

I'm in the same boat.

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BJ43 · May 19, 2014

Got back from a 14 day trip and my raptor with a 4200mAh 60C lipo pack had discharged the batteries while sitting idle. Is there anyway to prevent this or should I just install a power on/off master switch? Battery pack was below limits and had to be jump started to get it to charge again. Thankful it didn't ruin the battery and it is charging again..

mamu · May 19, 2014

Charging or removing the batts from the mod once they reach the cutoff voltage is definitely recommended or if you're not going to use your mod for a while, remove the batts. Or install a rated master on/off switch and remember to use it lol.

The zener protects the batts from undervoltage by not letting the converter fire below the zener's breakdown voltage, but the zener does not stop the idle current drain.

BJ43 · May 19, 2014

mamu said:
Charging or removing the batts from the mod once they reach the cutoff voltage is definitely recommended or if you're not going to use your mod for a while, remove the batts. Or install a rated master on/off switch and remember to use it lol.

The zener protects the batts from undervoltage by not letting the converter fire below the zener's breakdown voltage, but the zener does not stop the idle current drain.

Thanks mamu.

Just curious if there was a zener that could be used on the input....

mamu · May 19, 2014

Not that I'm aware of and there would still be the idle current drain at the on/off control.

Bypassing the on/off control has its advantages and disadvantages. Without it, we don't have that idle current drain and have to use a rated switch. With it we have at least some undervoltage protection via zener and are able to use a non-rated switch.

The proper and best way for UVLO would be to use a supervisory circuit. I was working with that for the OKL2-T20 and what's available is just too tiny unless you mount it on a PCB specifically made for it.

BJ43 · May 19, 2014

How about a 20 amp P or N mosfet on input and control the gate with a zener? Just asking, I know very little electronics...

jakl_53 · May 20, 2014

What would cause it to fire line that? That worries me a little bit.

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jakl_53 · May 20, 2014

jakl_53 said:
What would cause it to fire like that? That worries me a little bit.

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Dang Tapatalk. Meant to edit but apparently I replied to myself.

BJ43 · May 20, 2014

jakl_53 said:
What would cause it to fire line that? That worries me a little bit.

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If your question was about why it drained the batteries?. It wasn't firing on its own. The raptor used with its internal on/off control will have a small idle current draw. This over a long time can drain the batteries below acceptable limits.

jtwalker78 · May 20, 2014

Mamu will you please post a full updated wiring diagram and parts list

ftlum · May 22, 2014

mamu · May 22, 2014

@ jtwalker78 - the wiring guide in the OP is current - any changes I make to it is automatically updated as the pic is linked externally.

I gave most of the part numbers for the parts I used for the build in the OP, plus gave the part number for the zener and the recommended P-FET and some other part numbers in earlier posts in this thread. It's much easier for everyone to read this thread and take note of the parts we are using than for me to repeatedly re-post part numbers. digikey or mouser has most all these parts plus you can search octopart.com to find who has them in stock and at what price.

The zener is for under voltage battery protection - when the input voltage gets to the zener breakdown voltage + 0.4v (input low voltage at on/off control), the converter will not fire. However, the zener does NOT block idle current drain at the on/off control - if you don't remove the batts at their low cutoff voltage, the batts will continue to drain below an unsafe voltage.

I'm still using the 5.6v zener diode I linked to in an earlier post in this thread. BJ linked to the 6.2v zener he's using in an earlier post in this thread. It's at your option to use whatever breakdown voltage you want. The main concern when choosing a zener, besides its breakdown voltage, is power dissipation - 500mW or less is a good choice.

fatdaddyvapes.com has the best 510 Connectors for Box Mods. Reasonably priced, stainless steel, and with a center adjustable pin.

Use 1/8W or 1/4W resistors - higher power is not necessary.

Recommended wiring gauge: 18ga-20ga pins 1, 3, 6, 10 (lower gauge recommended if running max or close to max amp loads, even 16ga would be appropriate if you want). 22ga-24ga pins 2, 5, 9.

Although the datasheet recommends a 7.5K pull-down resistor (and as shown in the wiring guide), there have been a few reports of auto-firing with that value plus I found with a 12v power supply for my passthru mod (and BJ found this too), that 7.5K resistor is too high to prevent auto-firing. For this reason I am now using a 4.7K pull-down resistor with all my future builds. I still have though 2 Raptor mods with the 7.5K resistor and no issues at all with auto-firing. So it's at your option to use a 7.5K or a lower value such at 4.7K with series 18650 batts, but you have to use a lower resistor value if using a 12v power supply.

ftlum · May 23, 2014

mamu said:
@ jtwalker78 - the wiring guide in the OP is current - any changes I make to it is automatically updated as the pic is linked externally.Although the datasheet recommends a 7.5K pull-down resistor (and as shown in the wiring guide), there have been a few reports of auto-firing with that value plus I found with a 12v power supply for my passthru mod (and BJ found this too), that 7.5K resistor is too high to prevent auto-firing. For this reason I am now using a 4.7K pull-down resistor with all my future builds. I still have though 2 Raptor mods with the 7.5K resistor and no issues at all with auto-firing. So it's at your option to use a 7.5K or a lower value such at 4.7K with series 18650 batts, but you have to use a lower resistor value if using a 12v power supply.

thanks, Mamu! There seem to be a lot of 4.7k resistors. I'm not sure what the differences are. Could you post a link to one that you'd recommend?

BTW, do people like mouser any better than digikey? I'd be having things shipped to California, if it matters.

Frank

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