What happens when a MOSFET passes a high current?

What happens when a MOSFET passes a high current?

Generally speaking, a MOSFET passing high current will heat up. Poor heat sinking can destroy the MOSFET from excessive temperature. One way of avoiding too-high current is to parallel multiple MOSFETs so they share load current.

When does back EMF freewheel when switching MOSFETs?

When switching inductive loads there must be a path for back EMF to freewheel when the MOSFET switches off. Freewheeling is the sudden voltage spike seen across an inductive load when its supply voltage is suddenly interrupted.

Why is the polarity reversed in p channel MOSFETs?

The polarity is reversed in P-channel MOSFETs.) A problem can arise because of the slow turn-off (or reverse recovery) of the internal body diode when the opposing MOSFET tries to turn on. MOSFET body diodes generally have a long reverse recovery time compared to the performance of the MOSFETs themselves.

Why do MOSFETs have a long reverse recovery time?

A problem can arise because of the slow turn-off (or reverse recovery) of the internal body diode when the opposing MOSFET tries to turn on. MOSFET body diodes generally have a long reverse recovery time compared to the performance of the MOSFETs themselves.

How is an intrinsic body diode formed in a MOSFET?

(An intrinsic body diode is formed in the body-drain p-n junction connected between the drain and source. In N-channel devices, the body diode anode connects to the drain. The polarity is reversed in P-channel MOSFETs.)

What is the allowable temperature for MOSFET safe operating area?

Looking at the transient thermal impedance plot we find that Z th (JC) crosses 0.125°C/W at roughly 2ms, which also matches the SOA plot. With an understanding of transient thermal impedance plots, we can calculate the allowable time for case temperatures other than 25°C.

What is the voltage rating of a 600 V MOSFET?

Typically, this is reflected in the rated voltage specifications of high voltage MOSFETs (HVMs). A 600 V MOSFET at TJ = 25 °C has a 650 V or higher rating at TJ = 150 °C. However, the improved rating is not of much benefit to the user as it is relevant only in steady state where VDS is gradually increased.

How did the MOSFET revolutionize the electronics industry?

It is a compact transistor that has been miniaturised and mass-produced for a wide range of applications, revolutionizing the electronics industry and the world economy, and being central to the digital revolution, silicon age and information age.