OUTP

OUTN

OUTP Current

OUTN Current

0V

0V

>0A

<0A

OUTP

OUTN

OUTP Current

OUTN Current

0V

0V

0A

0A

TPA3221

11

21

AVDD

1SPW

TPA3221

11

21

AVDD

1SPW

TPA3221

SLAVE2

12

OSCM

OSCP

13

TPA3221

SLAVE1

12

OSCM

OSCP

13

TPA3221

MASTER

12

OSCM

OSCP

13

TPA3221

SLAVE2

12

OSCM

OSCP

13

TPA3221

SLAVE1

12

OSCM

OSCP

13

TPA3221

SLAVE1

12

OSCM

OSCP

13

TPA3221

SLAVE2

12

OSCM

OSCP

13

RESET

RESET

RESET

RESET

RESET

RESET

RESET

10

10

10

10

10

10

10

17

TPA3221

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SLASEE9 – JUNE 2017

Product Folder Links: TPA3221

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Copyright © 2017, Texas Instruments Incorporated

Figure 7. Gain and Master PCB Implementation

Placement on the PCB and connection of multiple TPA3221 devices in a multi channel system is illustrated in .

Slave devices should be placed on either side of the master device, with a Slave1 device on one side of the

Master device, and a Slave2 device on the other. In systems with more than 3 TPA3221 devices, the mastyer

should be in the middle, and every second slave devices should be a Slave1 or Slave 2 as illustrated in .

9.3.3 AD-Mode and 1SPW-Mode PWM Modulation

TPA3221has the option of using either AD-Mode or 1SPW-Mode PWM modulation scheme. AD mode has

continuous switching of the two half bridge outputs in each BTL output channel. Both half bridge outputs are

switching in 1SPW mode, but with reduced duty cycle for idle operation an while playing small signals. With

higher output levels one half bridge stops switching on 1SPW mode operation. 1SPW benefits both devide power

loss and EMI performance, where AD mode is concidered to have the highest audio performance.

Figure 8. AD-Mode Configuration

Figure 9. 1SPW-Mode Configuration

Figure 10. AD Mode Output Waveforms, Idle and High (Dashed) Level Output