App note from Vishay on their ultra fast recovery diodes as demanded by newer high switching frequency and high voltage MOSFETs and IGBTs as applied in DC/DC converters and inverter circuits. Link here (PDF)
This application note describes the basic operating principles of bootstrap and desaturation circuits commonly used with high voltage IC drivers and provides a general guideline for pairing the IC driver with the right component that allows it to work properly and safely.
The new devices are very fast and can work at higher and higher frequencies, so a new generation of IC drivers has been developed that allows them to switch with dV/dt up to 100 kV/μs. In addition, at the buffer function, new gate driver ICs implement insulation, desaturation protection, soft turn-off, active clamping, and many other features that require an auxiliary diode.