TI例程PMP21529中提到四开关BUCKBOOST应用中,用UCC27211A实现上管100%占空比,
我查看了UCC27211A的资料,是利用自举电容实现的上管开通功能。若按照例子里面所说,下管长时间不开通,驱动自举电容电量是否会释放掉,无法实现上管常通?
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Hi
你以同步降压芯片为例,很多芯片都是可以实现100%duty下工作,同样的道理高低边驱动一样可以实现的,除非有duty限制。