How use N-Fet for Reverse Battery Protection on my Raptor 20A build?

[Duffloop]

Hi all,

I followed AdviceAdvice's excellent YouTube vid on putting a Raptor 20A together:

http://youtu.be/FIhHMM1vF_o

Bought the bits myself (he doesn't ship to UK) and the thing is you see, erm, I done gone bought the wrong Mosfet for the Reverse Battery protection.

Shoulda got this P-Fet:
IPD042P03L3 G Infineon Technologies | Mouser

But I got this N-Fet by mistake (brain fart):
MOSFET N-CH 30V 50A
IPD060N03L G Infineon Technologies | Mouser

I thought I read somewhere you can do the same with an N-Fet?

My wiring diagram is below, with no reverse battery protection - soooo, I'm wondering if it can be done with that N-Channel one I bought?

(also if you see anything wrong with the diagram let me know, though it works great - in fact damned happy with the raptor!)

Thanks!

 

[rhelton]

You dont need it bro the board has it built in along with the input caps too. Some will say different but the spec sheet states it.

 

[Duffloop]

You dont need it bro the board has it built in along with the input caps too. Some will say different but the spec sheet states it.

LOL - Assuming you're right you've just made my day

ere - I see 2 capacitors on the board - presume that's what you're referring to? Begs the question - now I've got 4 - what's the score?

Bit odd no one mentioned this before?

 

[david4500]

http://apps.geindustrial.com/publibrary/checkout/Data Sheets|NSR020A0X|generic

There is over current protection and over temperature protection on board (also undervoltage protection, but the value is too low to be useful for a box mod). The data sheet does not mention protection from reverse polarity.

The data sheet recommends capacitors. For input caps some people recommend them, others consider them optional. For Mamu's Raptor 20 amp build (http://www.e-cigarette-forum.com/fo...flip-top-vv-mod-20a-120w-dc-dc-converter.html) I believe she had a minor issue which using the input caps helped prevent. In her post, you'll also find a diagram showing how to wire a p-channel mosfet for reverse protection. An n-channel will not work for this purpose.

For the slide switch for your voltmeter selector, the switch type should be on-on, on-off-on, or on-on-off.

 

[Duffloop]

http://apps.geindustrial.com/publibrary/checkout/Data Sheets|NSR020A0X|generic

There is over current protection and over temperature protection on board (also undervoltage protection, but the value is too low to be useful for a box mod). The data sheet does not mention protection from reverse polarity.

The data sheet recommends capacitors. For input caps some people recommend them, others consider them optional. For Mamu's Raptor 20 amp build (http://www.e-cigarette-forum.com/fo...flip-top-vv-mod-20a-120w-dc-dc-converter.html) I believe she had a minor issue which using the input caps helped prevent. In her post, you'll also find a diagram showing how to wire a p-channel mosfet for reverse protection. An n-channel will not work for this purpose.

For the slide switch for your voltmeter selector, the switch type should be on-on, on-off-on, or on-on-off.

Damn that's a long thread, lol - wonder what the issues were for the capacitors...

(changed wiring for on-on switch ;-)

 

[david4500]

If you need more reading material there is another post here: Tinkering with the Naos Raptor - 20A, 120W dc/dc converter...

If I recall correctly, the reason why she chose to use fuses is a page or two in.

Good luck with your build Duffloop!

 

[Duffloop]

If you need more reading material there is another post here: Tinkering with the Naos Raptor - 20A, 120W dc/dc converter...

If I recall correctly, the reason why she chose to use fuses is a page or two in.

Good luck with your build Duffloop!

Cheers David - this is what they say about using the extra caps:

An input capacitance must be placed directly adjacent to the input pin of the module, to minimize input ripple voltage and ensure module stability.​

ps - already built ;-)

 

[david4500]

Very nice!

 

[rhelton]

I agree .