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LM5113-Slide12

Another challenge of a high reverse source-to-drain voltage is the potential of more losses during the dead-time. If circuit timing is not correct, the reverse conduction time can be too long, giving excessive losses or too short, giving cross conduction. A gate driver with separate input pins and matched propagation delays, allows either analog or digital tuning of the dead-time while the matched propagation delays maintain correct timing over a wide range of operating conditions. Shown in the scope shot is the switch node waveform with the dead-time minimized. Well matched propagation timing of the two channels is critical and users can see the negative peak is reduced.

PTM Published on: 2012-10-16