UPD780982 데이터 시트보기 (PDF) - NEC => Renesas Technology

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UPD780982

8-Bit Single-Chip Microcontrollers

NEC => Renesas Technology 

CHAPTER 1 OVERVIEW OF FUNCTIONS

Figure 1-2 shows the switching timing of the normal phase output.

When switching occurs at the intersection of the sawtooth and sine waves, a waveform like that indicated by "a"

below is generated. However, depending on the complexity of the processing and the number of settings, the

sample application simulates switching at the timing indicated by "b."

Figure 1-2. Switching Timing

Normal phase output a

Normal phase output b

1.2 Dead Time

To prevent the positive and negative transistors of each phase from going on together, dead time is inserted into

the PWM output. The dead time can be set, by key input, to a value of between 1 µs and 32 µs, the output of the

PWM signal being driven low after the elapse of the previously set delay.

Figure 1-3. Dead Time

Normal phase output

Inverted phase output

Dead time

Dead time

14

Application Note U13119EJ4V0AN

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