Contents
What does it mean for a diode to be off?
If the voltage across a diode is negative, no current can flow*, and the ideal diode looks like an open circuit. In such a situation, the diode is said to be off or reverse biased. As long as the voltage across the diode isn’t negative, it’ll “turn on” and conduct current.
What happens if a diode fails open?
In the previous section, we assumed that the diode has an open-circuit failure. However, a failed diode can short out too. In this case, the diode will exhibit a small resistance in both directions. The common reasons for a diode failure are excessive forward current and a large reverse voltage.
What happens when the voltage across a diode is negative?
If the voltage across a diode is negative, no current can flow*, and the ideal diode looks like an open circuit. In such a situation, the diode is said to be off or reverse biased. As long as the voltage across the diode isn’t negative, it’ll “turn on” and conduct current.
How much power can a diode dissipate before it blows?
Just like any component, diodes can only dissipate so much power before they blow. All diodes should list maximum current, reverse voltage, and power dissipation. If a diode is subject to more voltage or current than it can handle, expect it to heat up (or worse; melt, smoke,…).
Why is diode is connected across the MOSFET?
Its the body diode, inherent to the mosfet. It exists due to the nature of construction. To better understand this, check wiki on power mosfet. And reg the current flow thing , you are a bit confused. Its a pmos, so connection would be made such that body diode is in reverse bias.
How are current and voltage of a diode interdependent?
As we know from the i-v curve, the current through and voltage across a diode are interdependent. More current means more voltage, less voltage means less current. Once the voltage gets to about the forward voltage rating, though, large increases in current should still only mean a very small increase in voltage.