MOSFET transistor

Block appearance in REPEAT VISION

 The MOSFET transistor block is a simplified model of a reverse diode field-effect transistor. The equivalent circuit consists of a parallel-connected key and a diode, transistor resistance is determined by the control signal (it is equal to internal resistance at activation, and equal to resistance in the closed state at deactivation).

 A signal > 0 shall be sent to the control port to open. The diode model also takes into account the forward bias voltage. The equivalent circuit is shown below Fig. 1:

Fig. 1 FET equivalent circuit

 Fig. 2 shows below the transistor CVD (diode - reverse connection, so its activated state is in the 3rd quadrant):

• Section 0-7 corresponds to the deactivated transistor state when the control command is g = 0: \(R_T\)=\(R_{clos.MOSFET}\);

• The open state of the diode illustrates section 1-2 when voltage drop across at transistor is less than the diode forward bias voltage: \(R_D\)=\(R_{int.Diode}\);

• Accordingly, in section 2-4, the diode is in the closed state and its resistance: \(R_D\)=\(R_{clos.Diode}\);

• Section 5-6 corresponds to the transistor state when the control command is g > 0: \(R_T\)=\(R_{int.MOSFET}\).

Fig. 2 CVD field-effect transistor

1.  Properties

Property	Default Value	Description	Units of measurement
Internal resistance	1e-2	-	Om
MOSFET off state resistance	1e12	-	Om
Diode resistance	1e-2	-	Om
Diode off state resistance	1e12	-	Om
Diode forward voltage	0.5	-	V
Snubber circuit	On	-	-
Snubber resistance	1e6	Available, when Snubber circuit - On	Om
Snubber capacitance	1e9	Available, when Snubber circuit - On	F

2.  Inputs and outputs

Parameters	Input/Output	Description	Units of measurement	Port type
Control input	Input	-	-	Automation
Drain	Input	-	-	Electronics
Source	Output	-	-	Electronics

In order to see the connection capabilities of the block, you need to go to page Description of block ports