Question: I want to use the TAS5122 in a system design that only has a +12V power supply. The datasheet says that the minimum value of GVDD is 16V. Is there a way that I can reconfigure the device to run from a +12V power supply?
Answer:
The TAS5122 can be used at 12V.
To to this simply connect GVDD (Pin 55) to GREG (Pin 3) and GVDD (Pin 30) to GREG (Pin 26). This will bypass the internal gate regulators to allow for 12V operation. I would give the previously menitioned nets separate net names and isolate each net with 1 Ohm resistors and connect to 12V. Use proper decoupling on each of these nets.
The UVP for this device is typically 7.4V, so your customer will be OK at 12V. The absolute maximum for this connection is 14.2V; therefore, the voltage on these newly created nets must not exceed 14.2V under any condition (DC plus transients).
One of the newer devices may be a better choice. The TAS5122 requires a power supply sequence (in the datasheet) and also 50mm x 1mm PVDD connections with PVDD snubbers, so it is not as easy to use as the newer devices.
Regards,
Fred