Hi,
I'm designing 3x TAS5613 in a 6-channel application, powered with a 500W DC-DC half-brick supply (Synqor IQ24 series). Trouble is, the supply has a maximum stable load capacitance limit of 1000uF, and with the design guideline recommending 1000uF per half-bridge output I need 12,000uF total for 6 channels.
Question is therefore what will happen if the PVDD capacitance gets dramatically reduced from 1000uF to 68uF? With linear or offboard positioned supplies, THD will probably spike at higher power, but the supply has line and load regulation of +-0.25% and will be mounted within 70mm from the chips on the same PCB, with its sense line connected straight to the load split.
Max power requirements are 90W/ch in 6ohms.
Regards,
Pierre