What causes a MOSFET driver to go bad?
The failures only come when they hurt – at the customer in the field. The customer is then accused of treating his power supplies badly, extensive endurance tests have been carried out and there have been no failures at all.
Why does my ignition coil keep going out?
Here is why! The leading cause of premature failure of an ignition coil is due to a worn or bad spark plug ignition cable. A bad spark plug ignition cable will have a much higher than normal resistance. This high resistance causes a very high amount of voltage to be generated from your ignition coil’s secondary winding.
Why does a high resistance ignition coil melt?
This high resistance causes a very high amount of voltage to be generated from your ignition coil’s secondary winding. This excessive voltage creates a high amount of heat which consequently melts the coil’s wire insulation.
What should the impedance of a MOSFET driver be?
You almost always choose a driver that costs as little as possible and can barely deliver the peak current needed for a fast gate charge. FET A becomes low impedance between 0.5 and 1.5 V at the gate, with FET B it is between 1 and 4 V and with FET C the level is between 3 and 4.5 V.
Why did my MOSFET break during the endurance test?
After all, nothing broke during the endurance test. Does the MOSFET gate driver have any influence in the case of disturbances? Interferences occurring in the device or field can, for example, bring additional charge to the gate via the parasitic mill capacity (from drain to source).
What happens when a MOSFET fails to short circuit?
The device fails short circuit, initially, with no externally visible signs. The problem with this failure mode is that, once it occurs, there is likely to be a chain reaction which will probably disintegrate the MOSFET, obliterating the evidence and probably blowing other devices to boot.
What happens when the body of a MOSFET blows up?
MOSFET body diodes generally have a long reverse recovery time compared to the performance of the MOSFETs themselves. If the body diode of one MOSFET conducts when the opposing device is on, a short circuit arises resembling the shoot-through condition.