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Dead-Time Image of onsemi's Dead-Time Example A and Example B Image of onsemi's NCP51561 Dead-Time Diagram

Shown here are the three modes of dead-time supported by the NCP51561. For any half-bridge configurations depicted by the application drawing to the right of this slide, if the high-side switch and low-side switch are turned on at the same time (sometimes called cross-conduction), then the high-voltage rail becomes shorted to ground, which is a very bad thing. This is sometimes called shoot-through current. The NCP51561 dead-time autonomously monitors input timing and controls the cross-conduction of outputs. There are three modes for dead-time: Mode A is where pin 6 (the DT input pin) is floating and cross-conduction is not allowed with 10 ns of minimum dead-time. Mode B is where pin 6 (the DT input) is tied to an external resistor from 1 kΩ to 300 kΩ and cross-conduction is not allowed with adjustable dead-time from 10 ns to 5 µs. Mode C is where pin 6 (the DT input pin) is tied to VDD and cross-conduction is allowed. Mode C would be applicable for non-half-bridge applications.

PTM Published on: 2023-05-16