SLOA316 November   2021 TAS2764 , TAS2780 , TAS2781

 

  1.   Trademarks
  2. 1Introduction
  3. 2Y-Bridge
  4. 3Modes of Operation and Registry Settings
  5. 4Power Threshold for Y Bridge
  6. 5Efficiency Improvement

3 Modes of Operation and Registry Settings

TAS2780 can have different modes of operation:

  • VBAT1S only supply, where the device is forced to work out of a low power rail mode of operation. For example, this can be used for a low power ultrasonic chirp when audio is not played.
  • PVDD only supply, where PVDD is the only supply used to deliver output power.
  • Y Bridge, where VBAT1S is used to deliver output power based on level and headroom configured. When audio signal crosses a programmed threshold Class-D output is switched over to PVDD.

The mode of operation can be set by setting the power modes registers (address=0x03 and address=0x04)shown in the Table 3-1 and Table 3-2.

Table 3-1 Bridge and Channel Settings (Address 0x03)
Bit Field Type Reset Description
7-6 CDS_MODE[1:0] RW Oh Class-D switching mode
00b = Y-bridge, high power on VBAT1S
01b = VBAT1S Only Supply of Class D
10b = PVDD Only Supply of Class D
11b=Y-Bridge, lower power on VBAT1S
Table 3-2 Selection of Internal or External VBAT1S (Address 0x04)
Bit Field Type Reset Description
7 VBAT1S_MODE RW Oh VBAT1S supply
0b = Supplied externally
1b = Internally generated from PVDD