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UC1846: UC1846 problem

Part Number: UC1846
Other Parts Discussed in Thread: UC1875-SP

Hi Sir

I am interested in the uc1846 chip in which I found the characters which could be controlled by external PWM signal on sync feet ( pin10) ,

meanwhile the CT feet (pin8) need to be grounded. Now my question are:

1. how much is the dead time after external PWM signal connect to the sync feet ?  like this design method than meet to drive full bridge circuit ?

2. The dead time still could be adjusted after external PWM signal connect to the sync feet ?