TAS6424E-Q1: DC diagnostics function

Hi Toshiro

Do you have access to this document: Understanding DC and AC Load Diagnostics in Automotive Class-D Amplifiers

The device won't be in PLAY when doing DC Load Diagnostics measurements. Although DC Load Diagnostics can be in the play state when it starts, this is from the data sheet: "DC Diagnostics can be started from any operating condition, but if the channel is in PLAY state, then the time to complete the diagnostic is longer because the device must ramp down the audio signal of that channel before transitioning to the Hi-Z state.... DC Diagnostic results are reported for each channel separately through the I2C registers."

Elise

Dear Xu san,

Thank you for your comment,
and I can see the document with below pdf, is that correct?
/cfs-file/__key/communityserver-discussions-components-files/14/sloa286-Understanding-DC-and-AC-Load-Diagnostics-in-Automotive-Class_2D00_D-Amplifiers.pdf

And the point of my question is,
after start up of TAS6424E, the IC goes to stable in the play state and play the sound(imagine that the sound played in the vehicle),
if the TAS6424E found some of the ch have short to GND/Battery/Across and open,
can TAS6424E,
  1. stop the output immediately? will the output state goes to Hi-z?
  2. indicate us with Fault or Warn pins?
  3. same the log in the diag register or something?

This is the detailed question focusing on TAS6424E not to the general items,,

And I'm sorry for rushing but the we need this information within today that customer need to reply.

Best regards
Yusuke

Hi Yusuke

Yusuke Torikai said:

after start up of TAS6424E, the IC goes to stable in the play state and play the sound(imagine that the sound played in the vehicle),
if the TAS6424E found some of the ch have short to GND/Battery/Across and open,

If already into PLAY mode, such kind of fault condition will trigger OC.

Yusuke Torikai said:

  1. stop the output immediately? will the output state goes to Hi-z?

Yes, sure.

Yusuke Torikai said:

  2. indicate us with Fault or Warn pins?

Fault pin will be low.

Yusuke Torikai said:

3. same the log in the diag register or something?

Register will tell you there's OC fault.

Hi Shadow san

Thank you for your confirmation and
if we met the short to Battery/GND condition during Play state,
We understood that we can notice that condition through Fault pin and check Over Current fault register shows fault.

Based on above I understood the function, but for example, I have 2 more question which noticed by Over Current, that
1. I think short to GND can be noticed by over current, but can we also notice the short to battery condition with Over current function? because the battery normally more than center voltage of spk output, so current will not flown from that pins.
2. if we can get such condition via Over current diag, but how much value should we set for each 2ohm and 4ohm ch for over current diag? Do you have any idea or suggestion? *depends on how much over current set, those short to Battery and GND cannot be diagnosed, I worried.

Best regards
Yusuke