TAS5760M-Q1: TAS5760M-Q1 Open load detection

Hi 

This device not able to detect open load. This is a very old device, not build any load diagnostic function.

Suggest to use 2PCS TAS6511 device instead of this one. 

Hi,

I have already implemented the TAS5760M-Q1 in my AVAS design as recommended in the datasheet.

The design is currently under the validation phase, and I need to implement an open-load detection mechanism without changing the amplifier part number.

Could you please suggest a suitable method or reference circuit for detecting a disconnected speaker (open-load condition) using the existing TAS5760M-Q1 design? Any application notes or recommended implementation would be greatly appreciated.

Hi

Kindly check if below document helps.

https://www.ti.com/lit/an/slva824a/slva824a.pdf?ts=1782366402707&ref_url=https%253A%252F%252Fwww.ti.com%252Fsitesearch%252Fen-us%252Fdocs%252Funiversalsearch.tsp%253FlangPref%253Den-US%2526nr%253D9%2526searchTerm%253Dslva824

Hi,

Thank you for your suggestion.

I reviewed the proposed external load diagnostic circuit. However, implementing this circuit will require additional PCB area and increase the BOM cost in the next hardware revision.

Meanwhile, could you please suggest an automotive Class-D amplifier similar to the TAS6511-Q1 (or an equivalent device) that meets the following requirements?

Application: Acoustic Vehicle Alerting System (AVAS)

Requirements:

• Automotive grade (AEC-Q100)

• Stereo speaker output (BTL)

• I²S audio interface

• I²C control interface

• Real-time load diagnostics while audio is playing:

  • Open load detection

  • Shorted load detection

  • Short-to-power detection

  • Short-to-ground detection

  • Thermal protection

  • Overcurrent protection

• MUTE and Shutdown control through GPIO

The objective is to detect speaker faults continuously during audio playback without requiring the amplifier outputs to enter the shutdown or high-impedance state.

Thank you.

Hi,

I need a 2-channel Class-D audio amplifier with the RTLDG (Real-Time Load Diagnostics) function.

Could you please suggest a suitable part?

Hi

Until today, all of silicon support RTLDG as I listed. Don't have special 2 channel IC.

Shadow He said:

Apart from TAS6511, you could check TAS6684 and TAS67524.

Hi,

Thank you for your feedback.

Regarding the Class-D Amplifier External Load Diagnostics application note shared by you, could you please confirm how reliable and robust this circuit is when implemented with the TAS5760M-Q1 for automotive applications? Has this circuit been validated by TI for production use?

Thank you.

Hi

Considering our previous conversation, I need to remind you that this APP note also not designed for Real Time. There's isolation circuit, will disconnect the detection circuit while amplifier start working. 

It is reliable as already some customer used on the car.

If you are looking for the RTLDG, you need to use high precision voltage and current sampling onto the output side, and use your SOC calculate the output impedance in real time.

Hi,

Thank you for your feedback.

I am planning to consider the TAS67524-Q1 for our new design and would appreciate clarification on the following points:

1. Is there any software compatibility difference between the TAS67524-Q1 and the TAS5760M-Q1?
2. What is the maximum voltage supported on the speaker outputs during a Short-to-Battery condition? Will the device reliably detect and operate with a 32 V Short-to-BATT condition?
3. Can the device detect Short-to-BATT and Short-to-GND faults on both the positive and negative speaker output terminals?
4. Does the device support independent Open-Load and Short-Circuit diagnostics on all four channels?
5. If only two channels are used, what is the maximum supported output power per channel? My application uses two 8 Ω, 10 W speakers.
6. Kindly share the complete technical documentation required for software and hardware development, including the software/programming guide, register map, application notes, and any available reference code or examples.
7. What is the expected product longevity/lifecycle for the TAS67524-Q1?

Hi

CHITHRAJ S said:

1. Is there any software compatibility difference between the TAS67524-Q1 and the TAS5760M-Q1?

Very large difference

CHITHRAJ S said:

2. What is the maximum voltage supported on the speaker outputs during a Short-to-Battery condition? Will the device reliably detect and operate with a 32 V Short-to-BATT condition?

Absolute max voltage is 30V for this part.

CHITHRAJ S said:

3. Can the device detect Short-to-BATT and Short-to-GND faults on both the positive and negative speaker output terminals?

Yes.

CHITHRAJ S said:

4. Does the device support independent Open-Load and Short-Circuit diagnostics on all four channels?

Yes.

CHITHRAJ S said:

5. If only two channels are used, what is the maximum supported output power per channel? My application uses two 8 Ω, 10 W speakers.

For 8 ohm load, 14.4V supply voltage, could have 15W power.

CHITHRAJ S said:

6. Kindly share the complete technical documentation required for software and hardware development, including the software/programming guide, register map, application notes, and any available reference code or examples.

Datasheet could follow this link: https://www.ti.com/drr/opn/TAS67524-Q1-DESIGN

Software could follow this link:  https://www.ti.com/drr/opn/TAS67524-GUI

CHITHRAJ S said:

7. What is the expected product longevity/lifecycle for the TAS67524-Q1?

This device RTM at last year. It's family is still keep developing right now.

Hi,

I'm referring to the Section 9.2.2 – PBTL Application in the TAS67524-Q1 datasheet.

Since my application requires only two output channels, I'm planning to use the PBTL configuration instead of the standard BTL configuration.

Could you please confirm the following:

1. Will all the diagnostic features (Open Load, Short-to-GND, Short-to-BAT, Shorted Load, Real-Time Load Diagnostics, Current Sense, etc.) be fully supported when the device is configured in PBTL mode?
2. What is the typical and maximum deep sleep current consumption of the device in DEEP SLEEP mode?

Chithraj,

I would like to ask you move away from the though of use PBTL for better usage of full channel.  as PBTL has more complexity on LC connection and sequence, which does bring many troubles to you and does not real benefit.

Yes, it is supported. while there could be many sequence related things to be specially care about. 

CHITHRAJ S said:

1. Will all the diagnostic features (Open Load, Short-to-GND, Short-to-BAT, Shorted Load, Real-Time Load Diagnostics, Current Sense, etc.) be fully supported when the device is configured in PBTL mode?

Power loss(idle current) information is specified in datasheet electrical table.

CHITHRAJ S said:

2. What is the typical and maximum deep sleep current consumption of the device in DEEP SLEEP mode?

Dylan

Hi Dylan,

Thank you for your suggestions.

Based on your recommendation, I will proceed with the Section 9.2.1 BTL Application schematic and use Channels 1 and 2 for my stereo application. Please confirm that this approach is appropriate.

1. Since Channels 3 and 4 will not be used, can their outputs simply be left NC (floating), or is there any recommended hardware configuration or software setting for the unused channels?
2. Are there any specific PCB layout recommendations that should be followed when only Channels 1 and 2 are used? For example, any considerations regarding routing, unused output pins, decoupling, or grounding for the unused channels.
3. Regarding the power consumption, I'm unable to find the DEEP SLEEP current consumption in the datasheet. Could you please confirm the typical and maximum current consumption in DEEP SLEEP mode?

Hi Dylan,

Please find attached the amplifier circuit for your review.

We are using the I2S and I2C interfaces for the amplifier. The I2C address will be configured through PU/PD resistors, as specified in the datasheet.

The default states of the STBY, PD, and FAULT pins will be finalized based on the software control configuration.

Channel 1 is configured as the left channel, Channel 2 as the right channel, and Channels 3 and 4 are left unconnected (NC).

Also, could you please confirm whether any series termination resistors are recommended for the I2S interface?

Amplifier_Circuit.pdf

Hi,

Could you please confirm whether the total shutdown current of the amplifier can be achieved at <10 µA with PVDD and DVDD in shutdown?

Hi,

We are currently at the design freeze stage and are building samples based on the new TAS67524QDKQRQ1 amplifier.

Unfortunately, we are unable to find stock for this device through TI or any of the online distributors.

We require at least 10 samples at the earliest to proceed with validation. Additionally, could you please confirm whether this device will be available for high-volume production in the coming months?

Please support. Thank you.