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Max Power of Vdc Rails


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#1 Andre Trollip

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Posted 30 September 2014 - 03:11 AM

Hi Guys,

I'm just wondering if anyone can tell me what the max amperage is that can be pulled from the 3.3 and 5V power rails of the N, N+, N2 and N2+ respectively, when powered from VDC jack and not USB?

I'm guessing whichever is smallest, 1A or A Max of the input source.

Or does the overall 125mA limit apply to the power rails as well?

Thanks & Regards

#2 CW2

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Posted 30 September 2014 - 07:04 AM

5V

 

All Netduino-s use MC33269DT-5.0G (datasheet pdf) linear regulator (LDO), which has "Output Current in Excess of 800 mA".

 

3.3V

 

Netduino gen 1 use 3.3V variant of the same LDO (MC33269DT-3.3G), which means max 800 mA, but it is connected to 5V LDO, so the effective max current will be smaller, due to losses.

 

Netduino gen 2 use DC/DC converter based on ST1S12GR (datasheet pdf), which has output current 700 mA (again connected to 5V LDO, so the effective max current will be smaller due to losses).

 

The 125 mA limit applies to microcontroller pins, not power rails. You have to subtract current consumed by Netduino onboard circuitry (30 ~ 100 mA) from the regulator output.



#3 Andre Trollip

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Posted 30 September 2014 - 07:23 AM

Thanks a lot for the clear explanation CW2. Appreciate it.

 

buy in the mean time I decided to power the component from a separate power source I'd probably need close to the limit. I'll rather play iy safe.

 

Ciao,

Andre






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