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Achieving higher power on TAS5708 and I2C related questions.

Other Parts Discussed in Thread: TAS5709, TAS5708

1. Refer to TAS5708 spec, page 14, figure 13. The doted line indicates we can achieve higher power with increase of heat sinking. Do you have details or guideline on where to add the heatsink?. Can the above be applied for TAS5709?

2. There is a maximum of Fscl on I2C at 400kHz without specifying the minimum. If the host operates the I2C as slow as around 40kHz, is this still ok?

3. According to  Page 23 of TAS5708, the 7-bit address for TAS5708 is 0011 011 (0x36). TAS5708 address can be changed from 0x36 to 0x38 by writing 0x38 to device address register 0xF9. Does it means we can change to address address we want to? Please specify clearly on this one.

 

 

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  • Steven:

    See my answers below:

    1. 20W per channel is the max power rating for TAS5708 (combined 40W) without heatsink.Thermal shutdown for output power above 40W can be prevented using heatsink.But still there are other limitations on over current limit which is around 6A.Also I need to point out that device has not been characterized above 40W. So if you see an application and if you can let us know the configurations (PVCC, Load, Power requriements) we can characterize and let you know. Since these are pad down, having a heatsink attached to the bottom will be ideal.

    2. There is no minimum speed limit on I2C 

    3. The reason to change the address is because of a conflict with another device with same adderss on the bus, then keep the other device on reset and write to 0XF9 with a value "00 00 00 38". After that point onwards,TAS5708 will have device address as 0X38.It will respond to all writes to 0X38 and ignore any writes to 0X36