STMicroelectronics TDA7387 Datasheet

TDA7387

4 x 41 W quad bridge car radio amplifier

'!0'03

Flexiwatt25

'!0'03

Flexiwatt25

(Vertical exposed pad)

Datasheet

-

production data

 Low external component count:

– Internally fixed gain (26 dB)

– No external compensation

– No bootstrap capacitors

 Protections:

– Output short circuit to GND, to V

S the load

, across

– Very inductive loads

– Overrating chip temperature with soft thermal limiter

– Load dump voltage

– Fortuitous open GND

– Reversed battery

– ESD

Features

 High output power capability:

– 4 x 41 W / 4  max.

 Low distortion

 Low output noise

 Standby function

 Mute function

 Automute at min. supply voltage detection

Order code

TDA7387

TDA7387EP

TDA7387EPAG

Description

The TDA7387 is an AB class audio power amplifier, packaged in Flexiwatt 25 and designed for high end car radio applications.

Based on a fully complementary PNP/NPN configuration, the TDA7387 allows a rail to rail output voltage swing with no need of bootstrap capacitors. The extremely reduced boundary components count allows very compact sets.

Table 1. Device summary

Package

Flexiwatt25

Flexiwatt25 vertical, exposed pad

Flexiwatt25 vertical, exposed pad

Packing

Tube

Tube

Tube

September 2013

This is information on a product in full production.

DocID024094 Rev 2 1/15 www.st.com

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4

5

1

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Contents

Contents

3

TDA7387

Block and pin connection diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.1

Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.2

Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.3

Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.4

PCB and component layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.5

Electrical characteristics curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.1

Biasing and SVR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.2

Input stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.3

Standby and muting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

3.4

Stability and layout considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2/15 DocID024094 Rev 2

TDA7387

List of tables

List of tables

Table 1.

Table 2.

Table 3.

Table 4.

Table 5.

Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

DocID024094 Rev 2 3/15

List of figures

List of figures

TDA7387

Figure 1.

Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Figure 2.

Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Figure 3.

Standard test and application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 4.

Components and top copper layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Figure 5.

Bottom copper layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Figure 6.

Quiescent current vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Figure 7.

Quiescent output voltage vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Figure 8.

Output power vs. supply voltage (4 

). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Figure 9.

Distortion vs. output power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Figure 10.

Distortion vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Figure 11.

Power dissipation and efficiency vs. output power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Figure 12.

Input/output biasing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Figure 13.

Flexiwatt25 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 14.

Flexiwatt25 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4/15 DocID024094 Rev 2

TDA7387

1

Block and pin connection diagrams

Block and pin connection diagrams

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Figure 1. Block diagram

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Figure 2. Pin connection (top view)

DocID024094 Rev 2

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5/15

Electrical specifications TDA7387

2.1 Absolute maximum ratings

Symbol

V

S

V

S (DC)

V

S (pk)

I

O

P tot

T j

T stg

Table 2. Absolute maximum ratings

Parameter Value

Operating supply voltage

DC supply voltage

Peak supply voltage (t = 50 ms)

Output peak current:

Repetitive (duty cycle 10 % at f = 10 Hz)

Non repetitive (t = 100 µs)

Power dissipation, (T case

= 70 °C)

Junction temperature

Storage temperature

18

28

50

4.5

5.5

80

150

– 55 to 150

Symbol

R th j-case

T amb

Table 3. Thermal data

Parameter

Thermal resistance junction-to-case max.

TDA7387

TDA7387EP/EPAG

Operative temperature range TDA7387EP

Operative temperature range TDA7387,TDA7387EPAG

Value

1

1.3

-30 to +85

-40 to +105

Unit

°C/W

 C

 C

V

S

= 14.4 V; f = 1 kHz; R g

= 600  ; R

L

= 4  ; T

diagram ( Figure 3

), unless otherwise specified.

amb

= 25 °C; Refer to the test and application

Symbol

I q1

V

OS

G v

Parameter

Quiescent current

Output offset voltage

Voltage gain

P o

Output power

Table 4. Electrical characteristics

Test condition

-

-

-

THD = 10%

THD = 1%

Min.

-

-

25

20

-

Typ.

Max.

Unit

180

-

26

22

18

300

100

27

mA mV dB

W

6/15 DocID024094 Rev 2

Unit

V

V

V

A

A

W

 C

 C

TDA7387 Electrical specifications

Symbol

P o max.

Max. output power

(1)

THD Distortion e

No

Table 4. Electrical characteristics (continued)

Parameter Test condition Min.

Output noise

SVR Supply voltage rejection f cl f ch

R i

C

T

I

SB

V

SB out

V

SB IN

A

M

V

M out

V

M in

I m (L)

Low cut-off frequency

High cut-off frequency

Input impedance

Cross talk

Standby current consumption

Standby out threshold voltage

Standby in threshold voltage

Mute attenuation

Mute out threshold voltage

Mute in threshold voltage

Muting pin current

1. Saturated square wave output.

V

S

= 14.4 V

V

S

= 15.2 V

P o

= 4 W

"A" Weighted;

Bw = 20 Hz to 20 kHz f = 100 Hz

-

-

f = 1 kHz

V standby

= 0 V

(Amp: on)

(Amp: off)

V

O

= 1Vrms

(Amp: play)

(Amp: mute)

V

MUTE

= 1.5 V (source current)

33

-

-

-

70

50

-

3.5

-

80

50

-

75

3.5

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90

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10

37

41

0.04

50

65

65

20

Typ.

Max.

Unit

-

-

0.3

W

V

V

µA

V

V dB

Hz kHz k  dB

%

 V

 V dB

µA

-

-

15

150

-

-

-

-

1.5

-

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DocID024094 Rev 2 7/15

Electrical specifications

2.4 PCB and component layout

Refer to Figure 3: Standard test and application circuit .

Figure 4. Components and top copper layer

TDA7387

Figure 5. Bottom copper layer

8/15 DocID024094 Rev 2

TDA7387 Electrical specifications

Figure 6. Quiescent current vs. supply voltage Figure 7. Quiescent output voltage vs. supply voltage

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Figure 8. Output power vs. supply voltage (4  )

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Figure 9. Distortion vs. output power

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Figure 10. Distortion vs. frequency

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Figure 11. Power dissipation and efficiency vs. output power

0

TOT

7 H

H

0

TOT

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DocID024094 Rev 2

'!0'03

9/15

Application hints TDA7387

Refer to Figure 3

.

3.1 Biasing SVR

As shown in

Figure 12

, all the TDA7387’s main sections, such as Inputs, Outputs AND AC-

GND (pin 16) are internally biased at half supply voltage level (Vs/2), coming from the

Supply Voltage Rejection (SVR) block. In this way no current flows through the internal feedback network. The AC-GND is common to all the 4 amplifiers and represents the connection point of all the inverting inputs.

Both individual inputs and AC-GND are connected to Vs/2 (SVR) by means of 100 k  resistors.

To ensure proper operation and high supply voltage rejection, it is of fundamental importance to provide a good impedance matching between Inputs and AC-GROUND terminations. This implies that C

1

, C

2

, C

3

, C

4

, C

5

capacitors have to carry the same nominal value and their tolerance should never exceed ± 10 %.

Besides its contribution to the ripple rejection, the SVR capacitor controls the turn ON/OFF time sequence and, consequently, plays an essential role in the pop optimization during

ON/OFF transients. To conveniently serve both needs, its minimum recommended value is 10µF .

Figure 12. Input/output biasing.

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The TDA7387’s inputs are ground-compatible and can stand very high input signals

(± 8 Vpk) without any performances degradation.

If the standard value for the input capacitors (0.1 µF) is adopted, the low frequency cut-off turns out to be 16 Hz.

DocID024094 Rev 2

TDA7387

3.3

Application hints

Standby and muting

Standby and muting facilities are both CMOS-compatible. If unused, a straight connection to

Vs of their respective pins would be admissible. Conventional low-power transistors can be used to drive muting and stand-by pins in absence of true CMOS ports or microprocessors.

R-C cells have always to be used in order to smooth down the transitions for preventing any audible transient noises.

Since a DC current of about 10 µA normally flows out of pin 22, the maximum allowable muting-series resistance (R

2

) is 70 k reasonably small (about 1 µF).

 , which is sufficiently high to allow a muting capacitor

If R

2

is higher than recommended, the involved risk is that the voltage at pin 22 may rise to above the 1.5 V threshold voltage and the device is consequently fails to turn OFF when the mute line is brought down.

About the stand-by, the time constant to be assigned in order to obtain a virtually pop-free transition has to be slower than 2.5 V/ms.

3.4 Stability and layout considerations

If properly layouted and hooked to standard car-radio speakers, the TDA7387 is intrinsically stable with no need of external compensations such as output R-C cells. Due to the high number of channels involved, this translates into a very remarkable components saving if compared to similar devices on the market.

To simplify pc-board layout design, each amplifier stage has its own power ground externally accessible (pins 2,8,18,24) and one supply voltage pin for each couple of them. Even more important, this makes it possible to achieve the highest possible degree of separation among the channels, with remarkable benefits in terms of cross-talk and distortion features.

About the layout grounding, it is particularly important to connect the AC-GND capacitor (C

5 to the signal GND, as close as possible to the audio inputs ground: this guarantees high

) rejection of any common mode spurious signal.

The SVR capacitor (C

6

) has also to be connected to the signal GND.

Supply filtering elements (C

7

, C

8

) have naturally to be connected to the power-ground and located as close as possible to the Vs pins.

Pin 1, which is mechanically attached to the device’s tab, needs to be tied to the cleanest power ground point in the pc-board, which is generally near the supply filtering capacitors.

The exposed pad package doesn't require any particular care compared to the ST standard flexiwatt package. For particular PCB configurations, in order to maximize the rejection against any disturbances coming from the battery line (SVR), it is suggested to use one of the following IC metal slug (heat-sink) connections:

 leave the slug simply electrically isolated from the PCB ground;

 in case of 2 layers board, connect the slug to the PCB power ground (P-GND) and not to the signal ground (S-GND);

 in case of a PCB with a layer dedicated to grounding (wide / diffused GND area with no distinction between P-GND and S-GND) connect the slug to the common board ground.

DocID024094 Rev 2 11/15

Package information TDA7387

12/15

In order to meet environmental requirements, ST offers these devices in different grades of

ECOPACK ® packages, depending on their level of environmental compliance. ECOPACK ® specifications, grade definitions and product status are available at: www.st.com

.

ECOPACK ® is an ST trademark.

Figure 13. Flexiwatt25 mechanical data and package dimensions

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DocID024094 Rev 2

TDA7387 Package information

Figure 14. Flexiwatt25 mechanical data and package dimensions

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DocID024094 Rev 2 13/15

Revision history

Date

09-Apr-2013

18-Sep-2013

Revision

Table 5. Document revision history

Changes

1

2

Initial release.

Updated Disclaimer.

TDA7387

14/15 DocID024094 Rev 2

TDA7387

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