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Old 02-19-2006, 02:49 PM   #1
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Default Sorry to sound like a n00bie

What are the differences between a MOSFET and a capacitor. The purpose of function?
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Old 02-19-2006, 06:45 PM   #2
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Default Re: Sorry to sound like a n00bie

MOSFET's supply power by reducing voltages. Capacitors smooth that power out and hold a small reserve for burst power usage.
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Old 02-19-2006, 07:28 PM   #3
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Default Re: Sorry to sound like a n00bie

Hmmmm ... MOSFETs can be used as amplifiers or switches. As an amplifier, a relative small signal controls a larger voltage or current. As a switch, the control voltage turns on or off a larger voltage or current. In the context of a VRM, the MOSFET is a switch that chops V(In), producing a square wave, which is rectified and filtered into a lower DC voltage. Controlling the duty cycle [T(On)/T(square wave)] controls the output voltage.

A capacitor is used to store energy and filter (smooth) a DC voltage. In a VRM the capacitor helps filter the square wave into DC, and handles current transients.
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Old 02-19-2006, 08:01 PM   #4
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Default Re: Sorry to sound like a n00bie

BTW, no need to apologize for "basic" electronics Qs. We all start with the basics at some point in our lives.
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Old 02-20-2006, 11:25 AM   #5
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Default Re: Sorry to sound like a n00bie

MOSFETs


capacitor


typical capacitors on this forum
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Old 02-20-2006, 09:33 PM   #6
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Default Re: Sorry to sound like a n00bie

MOSFET= Metal Oxide Semi-conductor Field-Effect Transistor. So basically, a transistor
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Old 02-20-2006, 11:29 PM   #7
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Default Re: Sorry to sound like a n00bie

MOSFETs and JFETs (Junction FET) are voltage controlled devices, in which the gate current (other than charging gate capacitance) is tiny or less. Bi-polar transistors are current controlled devices, with the base curent, depending on the device, ranging from u-Amps to Amperes.
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