My understanding is that most mosfets are enhanced mode and those are on with 0 gate voltage.
Thanks that was helpful!I remember reading the that the gate on a MOSFET has a large internal resistance so there is no need to put something like a 10K resistor between the voltage source and the gate to limit current. Is that correct? Bonus points if you can tell me what on the datasheet gives me this info.
One trade-off is that any series gate resistor will slow down the switching transition time from off to on or on to off, due to the RC time constant, causing the device to be in it's 'linear' mode longer and causing more device power dissipation (heat);Lefty
Most of what you said made sense. I was confused by "trade-off". You didn't explain the positive side of use a series resistor to the gate of a fet. Is is just that it's required to keep peak current down? And is there generally a good sized resistor people tend to use in general cases (100, 1k, 10K)?
But why are there two of the MC33239 chips?
You need two in the schematic to give two footprints on the PCB. These two footprints a different for different types of regulator, if you look at the schematic you will see one is MC33269ST-5.0T3 and the other is MC33269D-5.0. In practice only one of theses regulators is fitted, it gives the factory a choice of components to use if one gets to be in short supply.
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