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Battery overdrain protection
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#1 (permalink)      3/28/2019 8:41:16 AM US Central   quote/reply + tips
Ndrec
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Battery overdrain protection
Does the chip have some kind of battery drain protection so it won't go under, for example, 3 volts?

EDIT: found the info - it cuts off below 3.2V

Edited on 3/28/2019 at 10:03 AM. Reason: updated info
#2 (permalink)      3/28/2019 4:12:07 PM US Central   quote/reply + tips
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Wylie
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Mine didn't, pulled the battery and my Intellicharger D2 told me 3.05

Edit: Just pulled an 18350 and it read 2.89V when it wouldn't vape any longer.

Edited on 3/28/2019 at 4:20 PM. Reason:
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#3 (permalink)      3/28/2019 4:29:14 PM US Central   quote/reply + tips
wuwei.ap
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What's the mosfet chip? The cutoff might be the actual gate voltage.
#4 (permalink)      3/28/2019 6:24:14 PM US Central   quote/reply + tips
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Wylie
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Maybe you can make it out.
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#5 (permalink)      3/28/2019 6:38:35 PM US Central   quote/reply + tips
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Wylie
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+1 details
wuwei.ap wrote:

What's the mosfet chip? The cutoff might be the actual gate voltage.



Found this here

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#6 (permalink)      3/29/2019 2:24:20 AM US Central   quote/reply + tips
wuwei.ap
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The datasheet is here for the PKC26BB (PDF).

The Gate Threshold Voltage is: 1.3 (min); 1.6 (typical); 2.35 (max).

It's a dual mosfet. I assume that the layout means there's a voltage divider or that half the voltage trigger the gates. I don't really know enough to say, but it makes sense that way. So if the GTV(total) was 2.6 (min), 3.2 (typical) and 4.7, it sort of makes sense.
#7 (permalink)      3/29/2019 5:40:29 AM US Central   quote/reply + tips
Froese
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The board does not work like that (you can't use the gate threshold for that anyway). It has a boost converter (the small 6-pin IC on the pic) for the gate voltage (raises it to 10V or so). That chip has an undervoltage lock out which is additionally raised by a reverse polarity protection diode. From the datasheet I found, the UVLO of the chip is 1.98V and the diode could be anything from 0.4V to 1.1V (the markings are not uniq) - would give 2.4-3.1V (under load). For a reliable answer, you'ld have to measure it. I would say, it has an unspecified UVLO that keeps the battery save ;-)
#8 (permalink)      3/29/2019 3:54:13 PM US Central   quote/reply + tips
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Wylie
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Beyond me! My low volt math isn't what might be considered strong as I had to take the test twice many years ago. I do remember just about any circuit has to be measured to be sure of its properties.
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