What is the input voltage range?

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MacBook Air

Repair guides for the MacBook Air, Apple's current line of consumer laptops.

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txalex @txalex

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Опубликовано: 20 мар 2013 г.

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What is the input voltage range?

Does anyone have (factual) information on what the input voltage specification for the MacBook Air range is?

The powers upplies for the different models vary significantly in output voltage (14..18.6 V) and they have been reported to be interchangeable. How does this work? I understand variable current draws (and therefore variable power ratings). But in order to deal with varying voltages wouldn't the MacBook have to employ some sort of DCDC converter at the input side? If that is true what is the maximum input voltage range, specifically for the 11" MacBookAir?

I am interested in this to understand possible charging options for the MacBook (DIY and or commercial 3rd party)

Alex

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Are you looking for a specific model, or just a general idea?

20 мар 2013 г. из oldturkey03

Well, I am primarily interested in my own device (mid'12 11") but I guess the question is easily generalized.

20 мар 2013 г. из txalex

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oldturkey03 @oldturkey03

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Опубликовано: 20 мар 2013 г.

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txalex, looks like 18V with a fuse rated at 6amp 24V.

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Cheers mate!

And thanks for the diagram, although I have difficulties reading some of the labels. Do you know or can you tell from the diagram what the minimum input voltage would be - even the stock power supply delivers only 14.85V. And what role does the "adapter sense pin" play. Ah, maybe I'm asking too many questions - I just don't want to stupidly wire something up only to fry my mac. plus I was curious how those 3rd party commercial ext. batteries work.

21 мар 2013 г. из txalex

txalex, send me an email and I can get you the schematic to make it easier for you. Most likely the adapter sense circuit is there to determine if your power adapter is plugged in or not

21 мар 2013 г. из oldturkey03

the adaptersense pin is to identify the charger and to control the led

4 мар 2016 г. из William Hines

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Are you looking for a specific model, or just a general idea? — oldturkey03
Well, I am primarily interested in my own device (mid'12 11") but I guess the question is easily generalized. — txalex
Cheers mate!

And thanks for the diagram, although I have difficulties reading some of the labels. Do you know or can you tell from the diagram what the minimum input voltage would be - even the stock power supply delivers only 14.85V. And what role does the "adapter sense pin" play. Ah, maybe I'm asking too many questions - I just don't want to stupidly wire something up only to fry my mac. plus I was curious how those 3rd party commercial ext. batteries work. — txalex
txalex, send me an email and I can get you the schematic to make it easier for you. Most likely the adapter sense circuit is there to determine if your power adapter is plugged in or not — oldturkey03
the adaptersense pin is to identify the charger and to control the led — William Hines

MacBook Air

What is the input voltage range?

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