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1

4

IN1

−

PWM1

5

IN1

+

IN2

+

IN2

−

mute

mute

SGND

SGND

SGND1

SGND2

3

20

REL1

23

SW1

24

EN1

REL1

SW1

EN1

STAB

DIAGCUR

DIAGTMP

SW2

REL2

PWM2

21

22

19

15

13

EN2

SW2

REL2

EN2

16

14

17

6

11

8

9

7

2

Rfb

Rfb

INPUT

STAGE

INPUT

STAGE

TDA8929T

PWM

MODULATOR

PWM

MODULATOR

MODE

STABI

STAB

POWERUP

OSCILLATOR

MANAGER

VSSA VDDA

VSS1 VDD1

12

10

VSSA VDDA

VSS2(sub)

VSSD

VDD2

VMODE

VSSA

MODE

OSC

ROSC

18

MGU388

DIAG

CONTROL

AND

HANDSHAKE

DRIVER

HIGH

TDA8927J

TEMPERATURE SENSOR

AND

CURRENT PROTECTION

DRIVER

LOW

2

7

+25 V

−25 V

VSS1

VSS1

VSSA

VSS2

VSSD

VDDD

VDD2

VDDA

6

1

4

9

810

VDD2 VDD1

13

5

CONTROL

AND

HANDSHAKE

DRIVER

HIGH

DRIVER

LOW

14

11

12

17

16

3

15

BOOT1

OUT1

OUT2

BOOT2

SGND

(0 V)

Vi(1)

Vi(2)

Fig.5 Typical application schematic of the class-D system using TDA8929T and the TDA8927J.