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MLD633

39 k

Ω

R19

39 k

Ω

R7

10 k

Ω

220 nF

C2

R20

1 k

Ω

R10

Sumida 33

µH

CDRH127-330

L4

Sumida 33

µH

CDRH127-330

L2

GND

220 nF

C44

220 nF

C1

3

6

17

PWM2

5

4

8

9

10

12

15

n.c.

1

1 nF

C29

input 2

input 1

J5

J6

D1

(5.6 V)

D2

(7.5 V)

IN1

+

IN1

−

GND

2

11

SGND1

SGND2

S1

VSSA

VSS1

VSS2

VDDA

VDD2

VDD1

GND

1

2

1

2

1

2

QGND

QGND

QGND

QGND

OUT1

−

OUT1

+

OUT1

+

OUT2

−

OUT2

−

OUT2

+

BOOT2

BOOT1

OUT1

OUT2

VDDD

VDD1

VDD2

VSS2

VSS1

VDDD

VSSD

VSSA VSSD

27 k

Ω

R1

7

220 nF

C3

OSC

POWERUP

VSSA

220 nF

C5

MODE

VDDA

R24

200 k

Ω

VDDD

on

mute

off

U2

TDA8929T

CONTROLLER

C22

330 pF

C27

470 nF

C4

220 nF

C7

220 nF

C14

470 nF

C18

1 nF

C19

1 nF

C20

1 nF

C21

1 nF

C16

470 nF

C6

220 nF

C9

15 nF

C8

15 nF

C43

180 pF

IN2

+

IN2

−

R6

10 k

Ω

C26

470 nF

R4

10 k

Ω

1 nF

C28

C24

470 nF

R5

10 k

Ω

J3

J1

QGND

QGND

inputs

outputs

power supply

mode select

J4

J2

VSS

C25

470 nF

C23

330 pF

R11

5.6

Ω

C10

560 pF

VSSD

VDDD VSSD

R12

5.6

Ω

R13

5.6

Ω

R14

5.6

Ω

C11

560 pF

C12

560 pF

C13

560 pF

R22

9.1 k

Ω

VSSD

VSSA

VDDA

VDDD

C31

1 nF

C30

1 nF

C33

220 nF

C35

1500

µF

(35 V)

R21

10 k

Ω

C32

220 nF

C34

1500

µF

(35 V)

C38

220 nF

C39

220 nF

C41

47

µF

(35 V)

C36

220 nF

C37

220 nF

C40

47

µF

(35 V)

GND

QGND

QGND

bead

L6

L5

bead

L7

bead

GND

VDD

VSS

+25 V

−25 V

1

2

3

13

SW2

14

REL2

16

EN2

SW2

REL2

EN2

21

PWM1

23

SW1

24

15

9

3

U1

TDA8926J

or

TDA8927J

POWER STAGE

17

16

14

4

2

1

8

10

13

5

6

7

11

12

REL1

20

EN1

SW1

REL1

EN1

19

STAB

STAB

18

VSSD

22

DIAGCUR

DIAG

R16

24

Ω

R15

24

Ω

4 or 8

Ω

SE

4 or 8

Ω

SE

8

Ω

BTL

C17

220 nF

C15

220 nF

Fig.9 Two-chip class-D audio amplifier application diagram for TDA8926J or TDA8927J and TDA8929T.

R21 and R22 are only necessary in BTL applications with asymmetrical supply.

BTL: remove R6, R7, C23, C26 and C27 and close J5 and J6.

C22 and C23 influence the low-pass frequency response and should be tuned with the real load (loudspeaker).