ST TDA7570 User Manual

250W PWM high efficiency power audio amplifier

Features

■ Output power 2 x 70W / 1 x 250W @ THD<1%

■ PWM output

■ ±30V supply voltage (Max)

■ Stand-by

■ Mute

■ Protections against short circuit across the load

■ Chip thermal protection

■ External temperature sensor possibility

■ Thermal warning pins

■ Adjustable clip detector pin

Description

The TDA7570 is a switchmode power audio amplifier with differential inputs and PWM output.

Table 1. Device summary

TDA7570

HiQUAD64

The maximum output current and voltage swing are depending by the output circuitry (power supply, external power transistors and sensing resistors). The device can work as a stereo single-ended channels or a mono bridge power amplifier.

Order code Package Packing

TDA7570 HiQUAD64 Tray

August 2007 Rev 1 1/17

www.st.com

17

Contents TDA7570

Contents

1 Block and simplified application diagram . . . . . . . . . . . . . . . . . . . . . . . 3

2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.4 Notes on the electrical schematic shown in Figure 3 . . . . . . . . . . . . . . . . 11

3.4.1 Main characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4 Functions, pins and components description . . . . . . . . . . . . . . . . . . . 12

4.1 Components with critical placement and type: . . . . . . . . . . . . . . . . . . . . . 12

4.2 Input capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4.3 Short circuit protection current calculation . . . . . . . . . . . . . . . . . . . . . . . . 12

4.4 External thermal protection network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.5 Gate driving network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.6 External connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5 Package informations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

6 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

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TDA7570 Block and simplified application diagram

1 Block and simplified application diagram

Figure 1. Block and simplified application diagram

5V DIG

IN L+

IN L-

I-OFCLK

O0-15

CDsel1

CDsel2

NTC

THWint

THWext

2.5V

-2.5V

MUTE

ST-BY

IN R+

IN R-

PGND

FEED L IN +V

40

46

45

33

34

OSC

29

30

CLIP

31

CD

38

36

TERM.

37

54

52

REF

55

56

49

50

10

5332

SGNDDGND -VS +V

-VS +V

LEFT

CHANNEL

SIGNAL

PROCESSING

RIGHT

CHANNEL

SIGNAL

PROCESSING

REFL

S -VREF1

INTERFACE

-VS +V

REFL

+V

S

CHANNEL LEFT

HSD +

PROTECTIONS

CHANNEL LEFT

LSD +

PROTECTIONS

CHANNEL RIGHT

HSD +

PROTECTIONS

CHANNEL RIGHT

LSD +

PROTECTIONS

26,27,58,592557 60 61

-V

S

+VS -L

OW

4212928

SNR1

SPI1

13

14

SPI2

18

GPL

17

GPLS

22

GNLS

21

GNL

23

SNL2

24

SNL1

+V

-5

6

S

+5

15

-V

S

8

SPR1

7

SPR2

4

GPR

5

GPRS

63

GNRS

64

GNR

62

SNR2

+25V

OUTPUT

LOWPASS

FILTER

-25V

+25V

OUTPUT

LOWPASS

FILTER

-25V

OUT LEFT

OUT RIGHT

D00AU1198

3/17

Pin description TDA7570

2 Pin description

Figure 2. Pins connection diagram

N.C.

Gpr

Gprs

+Vs-5

Spr2

Spr1

+Vs-Vref1

pgnd

N.C.

+Vs

Spl1

Spl2

-Vs+5

N.C.

Gpls

Gpl

N.C.

Gnrs

Gnr

63

64

1

2

3

4

5

6

7

8

9

10

12

13

14

15

16

17

18

19

20

21 22 23 24 25

Gnl

Gnls

62

Snr2

Snl2

61

Snr1

60

Snl1

-Vs

-Vs+Vrefr

59

26

-Vs

-Vs+Vrefl

Feed R in

ST-BY

MUTE

CDsel1

CDsel2

+2.5V

CD

-Vs

58

57 56 55 54 53

271128 29 30 31 32

-Vs

Feed L in

sgnd

dgnd

52

51

50

49

48

47

46

45

44

43

42

41

40

39

38

37

36

35

34

33

-2.5V

N.C.

IN R-

IN R+

N.C.

IN L+

IN L-

N.C.

+Vs-low

N.C.

5Vdig

N.C.

NTC

THWext

THWint

N.C.

O0-I5

I-O-FCLK

AC00241

Table 2. Pins description

number

Name Function

1 N.C. Not connected

2 N.C. Not connected

3 N.C. Not connected

4 Gpr Gate PMOS, right channel +Vs-12V 30V

5 Gprs Sense gate PMOS, right channel +Vs-12V 30V

6+Vs-5 +Vs-6

7 Spr2 Sensing 2 PMOS, right channel 30V

8 Spr1 Sensing 1 PMOS, right channel 30V

9 +Vs-Vref1 Supply drivers PMOS +Vs-12V 30V

10 pgnd Power ground 0 (ref.)

11 N.C. Not connected

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Voltage l i m i t

(low)

Voltage l i m i t

(high)

TDA7570 Pin description

Table 2. Pins description (continued)

number

12 +Vs Positive power supply 30V

13 Spl1 Sensing 1 PMOS, left channel 30V

14 Spl2 Sensing 2 PMOS, left channel 30V

15 -Vs+5 -Vs+6

16 N.C. Not connected

17 Gpls Sense gate PMOS, left channel +Vs-12V 30V

18 Gpl Gate PMOS, left channel +Vs-12V 30V

19 N.C. Not connected

20 N.C. Not connected

21 Gnl Gate NMOS, left channel -30V -Vs+12V

22 Gnls Gate NMOS, left channel -30V -Vs+12V

23 Snl2 Sensing 2 NMOS, left channel -30V

24 Snl1 Sensing 1 NMOS, left Channel -30V

25 -Vs+Vrefl Supply drivers NMOS. left channel -30V -Vs+12V

26 -Vs Negative power supply -30V

27 -Vs Negative power supply -30V

28 Feed L in Feedback network left channel -5V 5V

Name Function

Voltage l i m i t

(low)

Voltage l i m i t

(high)

29 CDsel1 Clip detector selection 1 5.5V

30 CD sel2 Clip detector selection 2 5.5V

31 CD Clip detector output 5.5V

32 dgnd Digital ground 0 (ref)

33 I-O-FCLK Clock frequency input/output pin 5.5V

34 O0-I5

35 N.C. Not connected

36 THWint Internal thermal warning output 5.5V

37 THWext External thermal warning output 5.5V

38 NTC Sensing resistors network 5.5V

39 N.C. Not connected

40 5Vdig Digital 5V supply output 5.5V

41

42 +Vs-low Positive voltage supply low power 30V

43 N.C. Not connected

44 N.C. Not connected

Input/output FCLK selection 0 = Output; 1 = Input

5.5V

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Pin description TDA7570

Table 2. Pins description (continued)

number

45 IN L- Left channel negative input -3V 3V

46 IN L+ Left channel positive input -3V 3V

47 N.C. Not connected

48 N.C. Not connected

49 IN R+ Right channel positive input -3V 3V

50 IN R- Right channel negative input -3V 3V

51 N.C. Not connected

52 -2.5V Signal -2.5V supply output -2.75V

53 sgnd Signal ground 0 (ref)

54 +2.5V Signal 2.5V supply output 2.75V

55 MUTE Mute input 5.5V

56 ST-BY Stand by input 6V

57 Feed R in Feedback network right channel -5 5V

58 -Vs Negative voltage supply -30V

59 -Vs Negative voltage supply -30V

60 -Vs+Vrefr Supply drivers NMOS. Right channel -30V -Vs+12V

61 Snr1 Sensing 2 NMOS, right channel -30V

Name Function

Voltage l i m i t

(low)

Voltage l i m i t

(high)

62 Snr2 Sensing 1 NMOS, right channel -30V

63 Gnrs Sense gate NMOS, right channel -30V -Vs+12V

64 Gnr Gate NMOS, right channel -30V -Vs+12V

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