Application note from ON Semiconductors discussing possible abnormalities on High voltage gate driver when operating on short pulses. Link here (PDF)
The High−Voltage Integrated Circuit (HVIC) gate driver family is designed to drive an N−channel MOSFET or IGBT up to 600 V. One of the most common methods to supply power to the high−side gate drive circuitry of the high−voltage gate drive IC is the bootstrap power supply. This bootstrap power supply technique has the advantage of being simple and low cost. However, duty cycle is limited by the requirement to charge the bootstrap capacitor and serious problems occur when extremely short pulse width is used in the application system. This application note explains the features of HVIC gate drivers and provides recommendations to avoid short pulse−width issues in the application.