The MOS used in full-bridge, half-bridge, and push-pull circuits are generally NMOS, especially at the high-voltage end. PMOS is rarely seen. This...

QWE4562009

The MOS used in full-bridge, half-bridge, and push-pull circuits are generally NMOS, especially at the high-voltage end. PMOS is rarely seen. This... [Copy link]

The MOS used in full-bridge, half-bridge and push-pull circuits are generally NMOS, especially at the high-voltage end. PMOS is rarely seen. What is the consideration for this? From which aspects can it be analyzed?

1. NMOS has higher voltage resistance and simpler process?

2.

3........

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qwqwqw2088

The manufacturing reasons lead to price reasons. Hole conduction is more difficult to process than electron conduction.

PMOS is often used in the full bridge. Two PMOS are connected to the top as the upper bridge arm, and two NMOS are connected to the bottom as the lower bridge arm. This circuit is often used.

QWE4562009

qwqwqw2088 posted on 2022-12-3 20:01 The manufacturing reasons lead to the price reasons. The process of hole conduction is more difficult than that of electron conduction. PMOS is often useful in the full bridge. Two PMOS are connected on top...

Can't all four MOS use N tubes?

zengbiao12315

QWE4562009 posted on 2022-12-6 16:16 Can't all four MOS use N tubes?

Yes, but that requires a higher voltage to drive the high-side NMOS, and an additional power supply or a bootstrap circuit. In short, it means adding components and money, and the complexity is also increased.

fjdeepblue

Generally, NMOS has a smaller on-resistance than PMOS, a lower price than PMOS, and is easier to buy.

fjdeepblue

At low voltage, the full-bridge upper tube can also use PMOS, which will make the driving circuit simpler.

QWE4562009

fjdeepblue posted on 2023-12-15 16:05 When the voltage is low, PMOS can also be used for the full-bridge upper tube, which will make the driving circuit simpler

Why can't PMOS be used when high voltage is used?

fjdeepblue

QWE4562009 posted on 2023-12-15 16:36 Why can't PMOS be used when high voltage is applied

At high voltage, PMOS cannot be driven directly by transistors because the power consumption of the transistors responsible for level shifting is too high. Therefore, at high voltage, the driving circuit of PMOS is basically the same as that of NMOS, and using NMOS has more advantages.

dukedz

For nmos and pmos with the same process and size, pmos has a larger on-resistance, so pmos is less efficient and is not suitable for high-power applications.

Find the manuals of nmos and pmos of the same size package (even 2 MOS in one package), the same manufacturer and the same series, and compare the on-resistance.