Diagnosing Automotive Faults with Class D Audio Amplifiers(2)
2011年04月04日 09:11 www.brongaenegriffin.com 作者：電子發(fā)燒友 用戶評(píng)論（0）
Three-State Procedure
To avoid unwanted click-and-pop at shutdown, use the following procedure (Figure 2):
- If the audio source is already muted, then go to step 4.
- Set the outputs to mute mode by setting CTRL2.MD23[1:0] = CTRL2.MD01[1:0] = 01.
- Wait at least 50ms to ensure no click-and-pop from a 20Hz signal.
- Three-state the outputs by setting CTRL2.MD23[1:0] = CTRL2.MD01[1:0] = 00.
Figure 2. Three-State procedure.
Shutdown Procedure
To avoid unwanted click-and-pop at shutdown, use the following procedure (Figure 3):
- Three-state the outputs by following the three-state procedure outlined above.
- Enter standby mode by setting CTRL2.STBY = 1.
- Pull the EN pin low.
Figure 3. Shutdown procedure.
- 第 1 頁：Diagnosing Automotive Faults with Class D Audio Amplifiers(1)
- 第 2 頁：Three-State Procedure#
- 第 3 頁：Load Diagnostics#
- 第 4 頁：Short-to-Ground Diagnostic Procedure#
- 第 5 頁：Open Load Detection#
- 第 6 頁：Shorted Load/Resistance Measurement Detection#
- 第 7 頁：Tweeter Detection#
- 第 8 頁：Continuous Diagnostics#
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