What are the three poles of 2.2? MOS transistor, g, s, d?
(1). Judgment gate G.
MOS driver mainly plays the role of waveform shaping and driving enhancement: if the G signal waveform of MOS tube is not steep enough, it will cause a lot of power loss in the review switching stage, and its side effect is to reduce the conversion efficiency of the circuit. MOS tubes are seriously heated and easily damaged by heat, and there is a certain capacitance between MOS tubes GS. If the driving ability of G signal is not enough, it will seriously affect the time of waveform jump.
Connect the G-S short circuit, select the multimeter R× 1, connect the black stylus to the S pole, and connect the red stylus to the D pole. The resistance should be above several ohms to ten ohms. If it is found that the resistance between one pin and its two pins is infinite, and it is still infinite after exchanging probes, it is confirmed that this pin is G-pole because it is insulated from the other two pins.
(2) judging the source electrode S and the drain electrode D.
Set the multimeter at R× 1k, and measure the resistance between the three pins respectively. Measure the resistance twice by exchanging pens and meters, and the one with lower resistance (generally thousands of ohms to more than 10,000 ohms) is the forward resistance. At this time, the black pen is the S pole, and the red pen is connected to the D pole. Due to different test premises, the measured RDS(on) value is higher than the typical value given in the manual.
(3) measure the drain-source on-resistance RDS(on)
There is a PN junction between the source and the drain, so the S and D poles can be identified according to the difference of forward and reverse resistances of the PN junction. For example, use a 500 multimeter to measure an IRFPC50 vmosfet at R× 1, and RDS(on)=3.2W, which is more than 0.58W (typical).
3.g: gate gate S: source source D: drain MOS transistor is a metal oxide semiconductor field effect transistor. N-channel and P-channel are common in the market. N-channel power supply is generally connected to D, output S, and P-channel power supply is generally connected to S and output D.
4. The detection of MOS tube is mainly to judge the leakage, short circuit, open circuit and amplification of MOS tube.
The steps are as follows:
If there is a resistance value, it means that the MOS tube has leakage and has not been detected.
(1). Remove the resistor connecting the gate and the source, and the red and black probes of the multimeter will remain unchanged. If the hands gradually retreat to high resistance or infinity after removing the resistance, the MOS tube will leak electricity, but it will remain intact.
(2) Then connect the gate and source of the MOS tube with wires. If the pointer immediately returns to infinity, MOS is in a good state.
(3) The red pen is connected to the source electrode S of the MOS tube, and the black pen is connected to the drain electrode of the MOS tube. A good pointer should indicate infinity.
(4) Connect a resistor of100K Ω-200K Ω to the gate and drain, then connect the red pen to the source S of MOS and the black pen to the drain of MOS tube. At this time, the value indicated by the hands is generally 0. At this time, the lower charge charges the gate of the MOS tube through this resistor, resulting in a gate electric field. Because the electric field leads to the conduction channel and leads to the conduction of the drain and source, the multimeter pointer deflects.
? The above is how to use MOS transistor AO3402.