High idle power revisited

Author	Message
poida Guru Joined: 02/02/2017 Location: Australia Posts: 1404	Posted: 10:06am 06 Sep 2023       I see a rather large difference in turn on (& off) delay and rise times between the IRFP4468 and the HY4008 The test conditions for the parts are different so it's apples and oranges but it surely must give some guidance... IRFP4468: tested at Vgs = 10V, Rg = 2.7 Ohms turn on delay: 52ns rise time: 230ns turn off delay: 160ns fall time: 260ns HY4008: tested at Vgs = 10V, Rg = 6 Ohms turn on delay: 28ns rise time: 18ns turn off delay: 42ns fall time: 54ns clearly the HY4008 will switch a lot faster than the IRFP4468 total Gate charge is 195nC for the HY4008 and 360nC up to 580nC for the IRFP4468 I think the slower switching IRFP4468 require a longer deadtime than what you have designed. The shoot through is causing the high idle power consumption. Edited 2023-09-06 20:08 by poida