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Diagnosing Automotive Faults with Class D Audio Amplifiers(2)

2011年04月04日 09:11 www.obk20.com 作者：电子发烧友 用户评论（0）

Three-State Procedure

To avoid unwanted click-and-pop at shutdown, use the following procedure (Figure 2):

  1. If the audio source is already muted, then go to step 4.
  2. Set the outputs to mute mode by setting CTRL2.MD23[1:0] = CTRL2.MD01[1:0] = 01.
  3. Wait at least 50ms to ensure no click-and-pop from a 20Hz signal.
  4. Three-state the outputs by setting CTRL2.MD23[1:0] = CTRL2.MD01[1:0] = 00.

Figure 2. Three-State procedure.
Figure 2. Three-State procedure.

 

Shutdown Procedure

To avoid unwanted click-and-pop at shutdown, use the following procedure (Figure 3):

  1. Three-state the outputs by following the three-state procedure outlined above.
  2. Enter standby mode by setting CTRL2.STBY = 1.
  3. Pull the EN pin low.

Figure 3. Shutdown procedure.
Figure 3. Shutdown procedure.
 

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