Pretty much what the title says. The PMPB10XNX is actually a PMPB30XPEX however, there wasn't a symbol available for the chip so i just used the 10xnx since its the same exact package. PPS is driven by a Teensy.
- Use a P channel MOSFET symbol, make your own.
What is VIN resp. VIND?
Is an N channel, PMPB30XPEX is a P channel.
What is connected to VIND and VIN?
Welcome Back!
The packages may look the same but it is like a Christmas present, you do not know what is in it until you get it open. You are using a N-Channel MOSFET in place of a P-Channel device.
Basically i have to be able to disconnect a power line so VIN is the source and VIND is the output.
VIND is going something that needs power and VIN is the source, i need to be able to turn it off. Both chips have an identical pinout.
I'm not sure what the question is. The drawing shows an N-channel mosfet, which doesn't work. If you're asking whether the drawing would be correct with the right kind of mosfet, then I think the answer is yes. Well, I think 1K is a bit strong for the pullup resistor, but otherwise it's ok.
They may both have source, drain and gate, and be pinned out the same way, but what's inside is completely different. You need a P-channel mosfet for this to work.
Ok. It was whether the drawing was correct. I was trying to say i'm just using the N channel one to represent the P channel one, which i am using. There was no symbol available for the P channel one but they are both pinout and footprint identical.
Yes, i am aware.
Use the symbol for a generic P-channel like FQP27P06, VIN at top (source), VIND at bottom (drain), R60 from VIN to gate.
NOTE: Vgs MIN is -12V.
https://assets.nexperia.com/documents/data-sheet/PMPB30XPE.pdf
Be careful how you interpret this -12V. It' s AFAIK the max gate "cutoff" voltage.
Max gate/source "on" is 8volt.
All specs work upside down with P-fets.
This mosfet can't switch more than 8volt (Vin) with the circuit provided.
Leo..
I missed that in the product description, thanks for catching that!
A solution for this fet with an absolute max source/gate voltage of 8volt is to use the drive transistor in constant current mode. See fourth diagram on this page.
Base of the NPN transistor directly to the Arduino pin, emitter via a 680 Ohm resistor to ground. The resistor then sets the collector current
(emitter = 5V - 0.7BE = 4.3volt > 4.3 / 680 = 6.3mA)
and thus the max voltage across R60 (6V3).
A 6V8 zener can be added across R60 as an extra precaution.
Please flip the whole right half of the diagram upside down
That makes it easier to follow (drawing convention is VCC up, ground down).
Leo..
You didn't miss anything.
The max is 12V not 8V.