STMicroelectronics STPA008 Datasheet

STPA008

)OH[LZDWW

)OH[LZDWW

KRUL]RQWDO

*$3*36

Features

 High output power capability:

– 4 x 50 W/4 Ω Max.

– 4 x 28 W/4 Ω @ 14.4 V, 1 kHz, 10 %

– 4 x 72 W/2 Ω Max.

 MOSFET output power stage

 2 Ω driving capability

 Capable to operate down to 6 V (suitable for start-stop car operation)

 Excellent GSM noise immunity

 Hi-Fi class distortion

 Low output noise

 High immunity to RF noise injection

 Standby function

 Mute function

 Automute at min. supply voltage detection

 Low external component count

 Internally fixed gain (26 dB)

 Protections:

– Output short circuit to GND, to V the load s

, across

– Very inductive loads

4 x 50 W MOSFET quad bridge power amplifier

)OH[LZDWW

YHUWLFDO

Datasheet

-

production data

– Overrating chip temperature with soft thermal limiter

– Output DC offset detection

– Load dump

– Fortuitous open GND

– Reversed battery

– ESD

 Qualification in accordance to AEC Q100 standard

Description

STPA008 is a breakthrough MOSFET technology class AB audio power amplifier designed for high power car radio. The fully complementary

P-Channel/N-Channel output structure allows a rail to rail output voltage swing which, combined with high output current and minimized saturation losses sets new power references in the car-radio field, with unparalleled distortion performances.

STPA008 can operate down to 6V and this makes the IC compliant to the most recent OEM specifications for low voltage operation (so called

'start-stop' battery profile during engine stop), helping car manufacturers to reduce the overall emissions and thus contributing to environment protection.

Table 1. Device summary

Order code Package Packing

STPA008-4WX

STPA008-QIX

STPA008-48X

Flexiwatt25

(vertical)

Flexiwatt25

(horizontal)

Flexiwatt27

Tube

Tube

Tube

July 2015

This is information on a product in full production.

DocID027887 Rev 2

1/29

www.st.com

Contents

Contents

1

2

3

4

5

STPA008

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.1

Block diagram and application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.1

Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.2

Pin functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.1

Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.2

Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.3

Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3.4

Electrical characteristics curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.1

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.2

Battery variations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.2.1

4.2.2

4.2.3

Low voltage operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Cranks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Advanced battery management (hybrid vehicles) . . . . . . . . . . . . . . . . . 18

4.3

Protections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

4.3.1

4.3.2

4.3.3

Short circuits and open load operation . . . . . . . . . . . . . . . . . . . . . . . . . 19

Over-voltage and load dump protection . . . . . . . . . . . . . . . . . . . . . . . . . 19

Thermal protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

4.4

Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

4.4.1

4.4.2

DC offset detection (OD pin) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Clipping detection and diagnostics (CD-DIAG pin) . . . . . . . . . . . . . . . . 20

4.5

Heat sink definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

5.1

Flexiwatt 27 (vertical) package information . . . . . . . . . . . . . . . . . . . . . . . 22

5.2

Flexiwatt 25 (vertical) package information . . . . . . . . . . . . . . . . . . . . . . . 24

5.3

Flexiwatt 25 (horizontal) package information . . . . . . . . . . . . . . . . . . . . . 26

2/29

DocID027887 Rev 2

STPA008

6

Contents

Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

DocID027887 Rev 2

3/29

3

List of tables

List of tables

STPA008

Table 1.

Table 2.

Table 3.

Table 4.

Table 5.

Table 6.

Table 7.

Table 8.

Table 9.

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

Pin functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Flexiwatt 27 (vertical) package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Flexiwatt 25 (vertical) package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Flexiwatt 25 (horizontal) package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Document revision history. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

4/29

DocID027887 Rev 2

STPA008

List of figures

List of figures

Figure 1.

Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 2.

Application circuit (STPA008-4WX) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 3.

Application circuit (STPA008-48X) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 4.

Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Figure 5.

Quiescent current vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 6.

Output power vs. supply voltage (4 Ω ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 7.

Output power vs. supply voltage (2 Ω ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 8.

Distortion vs. output power (4 Ω ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 9.

Distortion vs. output power (2 Ω ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 10.

Distortion vs. frequency (4 Ω ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 11.

Distortion vs. frequency (2 Ω ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 12.

Figure 13.

Distortion vs. output power (4

Distortion vs. output power (2

Ω

Ω

, V

, V

S

= 6 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

S

= 6 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 14.

Supply voltage rejection vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 15.

Crosstalk vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 16.

Total power dissipation & efficiency vs. P o

(4 Ω , Sine) . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 17.

Power dissipation vs. average Output Power (4 Ω , audio program simulation) . . . . . . . . . 15

Figure 18.

Power dissipation vs. average Output Power (2 Ω , audio program simulation) . . . . . . . . . 15

Figure 19.

ITU R-ARM frequency response, weighting filter for transient pop. . . . . . . . . . . . . . . . . . . 15

Figure 20.

SVR charge diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 21.

Battery cranking curve example 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Figure 22.

Battery cranking curve example 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Figure 23.

Upwards fast battery transitions diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Figure 24.

Load dump protection diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Figure 25.

Thermal protection diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Figure 26.

Audio section waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Figure 27.

Flexiwatt 27 (vertical) package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Figure 28.

Flexiwatt 25 (vertical) package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Figure 29.

Flexiwatt 25 (horizontal) package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

DocID027887 Rev 2

5/29

5

Overview

1 Overview

STPA008

STPA008 is a complementary quad audio power amplifier. It is available in two different packages, Flexiwatt25 and Flexiwatt27. It embeds four independent amplifiers working in class AB, a standby and a mute pin, an offset detector and, only for the Flexiwatt27 package, a clipping detector and diagnostics output. The amplifier is fully operational down to a battery voltage of 6 V, without producing pop noise and continuing to play during battery transitions.

STPA008 can drive 2 ohm loads and has a very high immunity to disturbs without need of external components or compensation. It is protected against any kind of short or open circuit, over-voltage and over-temperature.

1.1 Block diagram and application circuit

Figure 1. Block diagram

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DocID027887 Rev 2

STPA008 Overview

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28

Pin description

Figure 4. Pin connection (top view )

&LEXIWATT

STPA008

&LEXIWATT

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8/29

DocID027887 Rev 2

STPA008 Pin description

Pin number

FW27

Pin number

FW25

20

21

22

23

16

17

18

19

24

25

26

27

12

13

14

15

10

11

8

9

6

7

4

5

1

2

3

19

20

21

22

15

16

17

18

23

24 n.a

n.a

11

12

13

14

9

10

7

8

5

6

3

4

1

25

2

IN3

AC-GND

OUT3+

PW-GND3

OUT3-

VCC

OUT4+

MUTE

OUT4-

PW-GND4

CD-DIAG

TAB

TAB

OD

PW-GND2

OUT2-

ST-BY

OUT2+

VCC

OUT1-

PW-GND1

OUT1+

SVR

IN1

IN2

S-GND

IN4

Table 2. Pin functions

Pin name Description

Device slug connection

Offset detector output

Channel 2, power ground

Channel 2, negative output

Stand-by

Channel 2, positive output

Supply voltage

Channel 1, negative output

Channel 1, power ground

Channel 1, positive output

Supply voltage rejection pin

Channel 1, input

Channel 2, input

Signal ground

Channel 4, input

Channel 3, input

AC ground

Channel 3, positive output

Channel 3, power ground

Channel 3, negative output

Supply voltage

Channel 4, positive output

Mute pin

Channel 4, negative output

Channel 4, power ground

Clipping detector and diagnostics output

Device slug connection

DocID027887 Rev 2

9/29

28

Electrical specifications STPA008

3.1 Absolute maximum ratings

Symbol

V

V

V

I

S

S (DC)

S (pk)

O

Table 3. Absolute maximum ratings

Parameter

Operating supply voltage

DC supply voltage

Peak supply voltage (for t = 50 ms)

Output peak current

Non repetitive (t = 100 μ s)

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

P tot

T j

T stg

GND max

V in max

V

SB max

V mute max

Power dissipation T case

= 70 °C

Junction temperature

Storage temperature

Ground pins voltage

Input pin max voltage

ST-BY pin max voltage

Mute pin max voltage

Value

18

28

50

10

9

85

150

-55 to 150

-0.3 to 0.3

-0.3 to 8

-0.3 to V s (pk)

-0.3 to 6

Unit

V

V

V

°C

V

V

V

V

A

A

W

°C

Symbol

R th j-case

Table 4. Thermal data

Parameter

Thermal resistance junction-to-case Max

Value

1

Unit

°C/W

10/29

DocID027887 Rev 2

STPA008 Electrical specifications

Refer to the test and application diagram, V

T amb

= 25 °C; unless otherwise specified.

S

= 14.4 V; R

L

= 4 Ω ; R g

= 600 Ω ; f = 1 kHz;

Symbol

V

OS

Parameter

General characteristics

V

S

I q1

Supply voltage range

Quiescent current

Output offset voltage

Table 5. Electrical characteristics

Test condition

-

R

L

= ∞

Play mode

Mute mode dV

OS

R i

During standby ON/OFF output transient voltage

During mute ON/OFF output transient voltage

Input impedance

ITU R-ARM weighted

(see

Figure 19 )

I

SB

Standby current consumption

-

V

St-by

= 1 V

V

St-by

= 0

Audio performances

P o

P o max.

THD

G v dG v e

No

SVR f ch

C

T

A

M

Max. output power

Distortion

Voltage gain

Channel gain unbalance

Supply voltage rejection

High cut-off frequency

Cross talk

Mute attenuation

THD = 10 %

THD = 1 %

THD = 10 %, 2 Ω

THD = 1 %, 2 Ω

Square wave input (2 Vrms)

R

L

= 4 Ω

R

L

= 2 Ω

V

S

= 15.2 V; R

L

= 4 Ω 

-

P o

= 4 W, 30kHz LPF

-

"A" Weighted

Bw = 20 Hz to 20 kHz f = 100 kHz; V r mode

= 1 Vrms, play

P

O

= 0.5 W f = 1 kHz P

O

= 4 W f = 10 kHz P

O

= 4 W

P

Oref

= 4 W

Min. Typ.

Max.

Unit

60

100

65

50

90

42

71

47

-

25

-0.5

-

-

-7.5

45

-

-

6

100

-90

-70

-7.5

26

20

45

37

-

55

-

-

-

190

-

-

-

29

23

50

40

70

300

75

60

100

45

77

50 -

-

-

0.01

0.02

26 27

-

40

50

+0.5

-

70

-

-

-

-

-

+7.5

65

2

1

18

280

+90

+70

+7.5

-

-

-

mV k Ω

μ A

μ A

V mA mV mV mV

W

W

W

W dB kHz dB dB dB

W

W

W

% dB dB

μ V

μ V

DocID027887 Rev 2

11/29

28

Electrical specifications STPA008

Symbol

Table 5. Electrical characteristics (continued)

Parameter Test condition

Control pin characteristics

I pin5

V

SB out

V

SB in

V

M out

V

M in

V

AM in

Ipin23

Standby pin current

Standby out threshold voltage

Standby in threshold voltage

Mute out threshold voltage

Mute in threshold voltage

V

S

automute threshold

Muting pin current

V

St-by

= 1 V to 2.2 V

(Amp: ON)

(Amp: OFF)

(Amp: Play)

(Amp: Mute)

Attenuation = 6 dB;

P

Oref

= 4 W

V

MUTE

= 0.8 V

(Sourced current)

Offset detector

V

V

OFF

OFF_SAT

V

OFF_LK

Detected differential output offset -

Off detector saturation voltage

Off detector leakage current

Clipping detector

V o

> V

OFF max

, I off Det

0 V < V off Det

< 18 V

= 1 mA

V o

< ±1 V

CD

LK

CD

SAT

CD

THD

Clip detector high leakage current CD Off

Clip detector saturation voltage

Clip detector THD level -

CD On; I

CD

= 1 mA

Min. Typ.

Max.

Unit

-

2.2

-

2.2

-

4.5

5

±1.3

-

-

-

-

-

-

-

-

-

-

5

8

±2

0.1

0

0

0.1

2

0.5

-

1

-

0.8

5.5

12

±2.7

0.2

15

1

0.2

3

V

μ A

V

V

μ A

μ A

V

%

μ A

V

V

V

V

12/29

DocID027887 Rev 2

STPA008 Electrical specifications

3.4 Electrical characteristics curves

Figure 5. Quiescent current vs. supply voltage Figure 6. Output power vs. supply voltage (4 Ω )

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Figure 7. Output power vs. supply voltage (2 Ω ) Figure 8. Distortion vs. output power (4 Ω )

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Figure 10. Distortion vs. frequency (4 Ω )

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DocID027887 Rev 2

*$3*36

13/29

28

Electrical specifications

Figure 11. Distortion vs. frequency (2 Ω )

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Figure 12. Distortion vs. output power

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S

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Figure 13. Distortion vs. output power

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S

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Figure 14. Supply voltage rejection vs. frequency

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Figure 15. Crosstalk vs. frequency

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Figure 16. Total power dissipation & efficiency vs. P o

(4 Ω , Sine)

3GLVV: Ș

Ș

9V 9

5/ [ȍ

I .+]

3GLVV

14/29

I+]

*$3*36

DocID027887 Rev 2

3R:

*$3*36

STPA008 Electrical specifications

Figure 17. Power dissipation vs. average

Output Power (4 Ω , audio program simulation)

3GLVV:

Figure 18. Power dissipation vs. average

Output Power (2 Ω , audio program simulation)

3GLVV:

9V 9

5/ [ȍ

*$866,$112,6(

9V 9

5/ [ȍ

*$866,$112,6(

&/,367$57

&/,367$57

3RDYJ: 3RDYJ:

*$3*36

Figure 19. ITU R-ARM frequency response, weighting filter for transient pop

/UTPUTATTENUATIOND"

*$3*36

(Z

'!0'03

DocID027887 Rev 2

15/29

28

General information STPA008

4.1 Operation

STPA008's inputs are ground-compatible. If the standard value for the input capacitors (0.22

μ F) is adopted, the low frequency cut-off is 16 Hz. The input capacitors should be 1/4 of the

capacitor connected to AC-GND pin for optimum pop performances (see Figure 2:

Application circuit (STPA008-4WX) ).

Standby and mute pins are both 3.3 V CMOS compatible.

RC cells at both mute and stand-by pins have always to be used in order to smooth the transitions for preventing any audible transient noise.

In case the stand-by function is not used, it could steadily be connected to V

S kohm resistance should be present between the power supply and the pin.

, but a 470

The capacitance on SVR sets the start-up and shut-down times and helps to have pop-noise free transitions. Its minimum recommended value is 10 μ F. To have a fast start-up time, the internal resistor on SVR pin, used to set the time constant, is reduced from 50 k Ω to 3 k Ω till voltage on SVR reaches VCC/4 -2V

BE

and then released. In this way the capacitor on SVR is charged very quickly to VCC/4, as shown in the following figure.

The time constant to be assigned to the standby pin in order to obtain a virtually pop-free transition has to be slower than 2.5 V/ms.

Figure 20. SVR charge diagram

6

##

6

## n 6

"%

4IME

'!0'03

SVR pin accomplishes multiple functions:

 it is used as a reference voltage for input pins (VCC/4)

 the capacitor connected to SVR improves the supply voltage ripple rejection

 it is used as a reference to generate the V

CC

/2 reference for the outputs

When the amplifier goes in standby mode or goes out from this condition, it is recommended to put the amplifier in mute to ensure the absence of audible noise. Then the stand-by pin can be set to the appropriate value (ground or > 2.6 V) and the capacitor on SVR pin is discharged or charged consequently.

4.2.1

16/29

Low voltage operation

The most recent OEM specifications require automatic stop of car engine at traffic lights, in order to reduce emissions of polluting substances. STPA008, thanks to its innovating

DocID027887 Rev 2

STPA008

4.2.2

General information design, allows a continuous operation when battery falls down. At 6 V it is still fully operational, only the maximum output power is reduced according to the available voltage supply.

If the battery voltage drops below the minimum operating voltage of 6V the amplifier is fast muted, the capacitor on SVR is discharged and the amplifier restarts when the battery voltage returns to the correct voltage.

Cranks

STPA008 can sustain worst case cranks from 16 V to 6 V, continuing to play and without producing any pop noise.

Examples of battery cranking curves are shown below, indicating the shape and duration of allowed battery transitions.

Figure 21. Battery cranking curve example 1

9

EDWW

9

9

9

9

9

W W

W

W

W

W W

WV

V1 = 16 V; V2 = 6 V; V3 = 7 V; V4 = 8 V t1 = 2 ms; t2 = 50 ms; t3 = 5 ms; t4 = 300 ms; t5 =10 ms; t6 = 1 s; t7 = 2 ms

Figure 22. Battery cranking curve example 2

9

EDWW

9

9

*$3*36

9

9

W

W

W

W

V1 = 16 V; V2 = 6 V; V3 = 7 V t1 = 2 ms; t2 = 5 ms; t3 = 15 ms; t5 = 1 s; t6 = 50 ms

W

DocID027887 Rev 2

WV

*$3*36

17/29

28

General information

4.2.3

STPA008

Advanced battery management (hybrid vehicles)

In hybrid vehicles, the engine ignition causes a fast increase of battery voltage which can reach 16 V in less than 10 ms. In addition to compatibility with low Vbatt, STPA008 is able to sustain upwards fast battery transitions without causing unwanted audible effects, like pop noise, and without any sound interruption thanks to the innovative circuit topology.

Figure 23. Upwards fast battery transitions diagram

'!0'03

18/29

DocID027887 Rev 2

STPA008 General information

4.3 Protections

4.3.1

4.3.2

Short circuits and open load operation

When the IC detects a short circuit to ground, to Vbatt or across the load, the output of the amplifier is put in three-state (high impedance condition).

In case of short circuit to ground or Vcc, the amplifier exits from the three-state condition only when the short-circuit is released and the output returns inside the limits imposed by an internal voltage comparator.

When a short across the load is present, the power stage sees an over-current and is brought in protection mode for about 100 μ s. After this time, if the short circuit condition is removed the amplifier returns to play, otherwise the high impedance state is maintained and the check is repeated every 100 μ s.

Disconnection of load (open load condition) doesn't affect the amplifier, which continues to play.

Over-voltage and load dump protection

When the battery voltage is higher than 19 V, the amplifier put in tri-state. It stops playing till the supply voltage returns in the permitted range.

The amplifier is protected against load dump surges having amplitude as high as 50 V and a

rising time as low as 2 ms (see Figure 24 ).

Figure 24. Load dump protection diagram

66DUMP

4.3.3

66CC

MS

MS

'!0'03

Thermal protection

If the junction temperature of the IC overcomes T j

= 150 °C, a smooth mute is applied to reduce output power and limit power dissipation. If this is not enough and the junction temperature continues to increase, the amplifier is switched off when it reaches the maximum temperature of 170 °C.

Figure 25. Thermal protection diagram

#

*UNCTIONTEMPERATURE #

#

DocID027887 Rev 2

'!0'03

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28

General information STPA008

4.4 Warnings

4.4.1

4.4.2

DC offset detection (OD pin)

STPA008 integrates a DC offset detector to avoid that an anomalous input DC offset is multiplied by the amplifier gain producing a dangerous large offset at the output. In fact an output offset may lead to speakers damage for overheating. The detector works with the amplifier un-muted and no signal at the inputs.

When the differential output voltage is out of a window comparator with thresholds ± 2V

(typ), the OD pin is pulled down.

Clipping detection and diagnostics (CD-DIAG pin)

When clipping occurs, the output signal is distorted. If the signal distortion on one of the output channels exceeds 1%, the CD-DIAG pin is pulled down. This information can be sent to an audio processor in order to reduce the input signal of the amplifier and reduce the clipping.

A short to ground and short to Vcc is pointed out by CD-DIAG. This pin is pulled down to 0 V till these shorts are present to inform the user a protection occurred.

CD-DIAG acts also as thermal warning. In fact every time T j down to notify this occurrence.

exceeds 140 °C, it is pulled

Figure 26. Audio section waveforms

34"90).

6/,4!'%

T

-54%0).

6/,4!'%

T

6S

/54054

7!6%&/2-

T

$)!'PIN

7!6%&/2-

#,)00).'

T

3(/244/'.$

/24/6S

4(%2-!,

02/8)-)49

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20/29

DocID027887 Rev 2

STPA008

4.5

General information

Heat sink definition

Assuming a power dissipation of 26 W (e.g. in the worst case situation of frequent clipping occurrence), considering T j

max is 150°C and assuming ambient temperature is 70 °C, the available temperature gap for a correct dissipation is 80 °C.

This means the thermal resistance of the system R

Th

has to be 80 °C/26 W = 3 °C/W.

The junction to case thermal resistance is 1 °C/W. So the heat sink thermal resistance should be approximately 2 °C/W. This would avoid any thermal shutdown occurrence even after long-term and full-volume operation.

DocID027887 Rev 2

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28

Package information STPA008

5.1

22/29

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.

Flexiwatt 27 (vertical) package information

Figure 27. Flexiwatt 27 (vertical) package outline

6

#

"

B)B

Ref

A

B

C

D

0IN

6

6

(

(

(

2

(

!

2

6

.

2

2

, ,

6

6

' ' &

2

Table 6. Flexiwatt 27 (vertical) package mechanical data

Dimensions

Millimeters Inches

(1)

Min.

4.45

1.80

-

0.75

Typ.

4.50

1.90

1.40

0.90

Max.

4.65

2.00

-

1.05

Min.

0.1752

0.0709

-

0.0295

Typ.

0.1772

0.0748

0.0551

0.0354

,

2

2

-

2

%

-

$

*$3*36

Max.

0.1831

0.0787

-

0.0413

DocID027887 Rev 2

STPA008 Package information

Ref

Table 6. Flexiwatt 27 (vertical) package mechanical data (continued)

Dimensions

Millimeters Inches

(1)

Min.

Typ.

Max.

Min.

22.07

18.57

15.50

7.70

-

3.35

3.70

3.60

0.37

-

0.80

25.75

28.90

-

-

-

-

-

-

-

-

-

-

R2

R3

R4

V

N

O

R

R1

V1

V2

V3

L4

L5

M

M1

H2

H3

L

(3)

L1

L2

(3)

L3

E

F

(2)

G

G1

H

(3)

H1

0.39

-

1.00

26.00

29.23

17.00

12.80

0.80

22.47

18.97

15.70

7.85

5

3.5

4.00

4.00

2.20

2

1.70

0.5

0.3

1.25

0.50

5°

3°

20°

45°

22.87

19.37

15.90

7.95

-

3.65

4.30

4.40

0.42

0.57

1.20

26.25

29.30

-

-

-

-

-

-

-

-

-

-

0.8689

0.7311

0.6102

0.3031

-

0.1319

0.1457

0.1417

0.0146

-

0.0315

1.0138

1.1378

-

-

-

-

-

-

-

-

-

-

1. Values in inches are converted from mm and rounded to 4 decimal digits.

2. dam-bar protusion not included.

3. molding protusion included.

Max.

0.9004

0.7626

0.6260

0.3130

-

0.1437

0.1693

0.1732

0.0165

0.0224

0.0472

1.0335

1.1535

-

-

-

-

-

-

-

-

-

-

Typ.

0.0866

0.0787

0.0669

0.0197

0.0118

0.0492

0.0197

5°

3°

20°

45°

0.8846

0.7469

0.6181

0.3091

0.1969

0.1378

0.1575

0.1575

0.0154

-

0.0394

1.0236

1.1508

0.6693

0.5039

0.0315

DocID027887 Rev 2

23/29

28

Package information

5.2 Flexiwatt 25 (vertical) package information

Figure 28. Flexiwatt 25 (vertical) package outline

STPA008

24/29

9

&

%

9

+

+

9

+

5

+

$

5

9

1

5

5

/ /

9

9

A

B

C

D

E

F

(2)

G

G1

H

(3)

H1

H2

H3

B)B:

Ref

3LQ

* * )

5

/

5

5

0

'

5

(

0

*$3*36

Table 7. Flexiwatt 25 (vertical) package mechanical data

Dimensions

Millimeters Inches

(1)

Min.

4.45

1.80

-

0.75

0.37

-

0.80

23.75

28.90

-

-

-

Typ.

4.50

1.90

1.40

0.90

0.39

-

1.00

24.00

29.23

17.00

12.80

0.80

Max.

4.65

2.00

-

1.05

0.42

0.570

1.20

24.25

29.30

-

-

-

Min.

0.1752

0.0709

-

0.0295

0.0146

-

0.0315

0.9350

1.1378

-

-

-

Typ.

0.1772

0.0748

0.0551

0.0354

0.0154

-

0.0394

0.9449

1.1508

0.6693

0.5039

0.0315

Max.

0.1831

0.0787

-

0.0413

0.0165

0.0224

0.0472

0.9547

1.1535

-

-

-

DocID027887 Rev 2

STPA008 Package information

Ref

Table 7. Flexiwatt 25 (vertical) package mechanical data (continued)

Dimensions

Millimeters Inches

(1)

Min.

Typ.

Max.

Min.

R2

R3

R4

V

N

O

R

R1

L4

L5

M

M1

L

(3)

L1

L2

(3)

L3

V1

V2

V3

22.07

18.57

15.50

7.70

-

3.35

3.70

3.60

-

-

-

-

-

-

-

22.47

18.97

15.70

7.85

5.00

3.50

4.00

4.00

2.20

2.00

1.70

0.50

0.30

1.25

0.50

5°

3°

20°

45°

22.87

19.37

15.90

7.95

3.65

4.30

4.40

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

0.8689

0.7311

0.6102

0.3031

-

0.1319

0.1457

0.1417

1. Values in inches are converted from mm and rounded to 4 decimal digits.

2. dam-bar protusion not included.

3. molding protusion included.

Typ.

0.0866

0.0787

0.0669

0.0197

0.0118

0.0492

0.0197

5°

0.8846

0.7469

0.6181

0.3091

0.1969

0.1378

0.1575

0.1575

3°

20°

45°

Max.

-

-

-

-

-

-

-

0.9004

0.7626

0.6260

0.3130

-

0.1437

0.1693

0.1732

DocID027887 Rev 2

25/29

28

Package information

5.3 Flexiwatt 25 (horizontal) package information

9

Figure 29. Flexiwatt 25 (horizontal) package outline

STPA008

9

+

+

+

+

5

5

1

5

5

9

9

9

$

9

0

26/29

5

0

*

*

) 5

0

B'B4,

Table 8. Flexiwatt 25 (horizontal) package mechanical data

Dimensions

Millimeters Inches

(1)

Ref

Min.

C

D

A

B

E

F

(2)

G

G1

H

(3)

H1

H2

H3

-

-

L 21.64

4.45

1.80

-

-

0.37

-

0.75

23.70

28.90

-

Typ.

4.50

1.90

1.40

2.00

0.39

-

1.00

24.00

29.23

17.00

12.80

0.80

22.04

Max.

4.65

2.00

-

-

0.42

0.57

1.25

24.30

29.30

-

-

-

22.44

Min.

0.1752

0.0709

-

-

0.0146

-

0.0295

0.9331

1.1378

-

-

-

0.8520

Typ.

0.1772

0.0748

0.0551

0.0787

0.0154

-

0.0394

0.9449

1.1508

0.6693

0.5039

0.0315

0.8677

*$3*36

Max.

0.1831

0.0787

-

-

0.0165

0.0224

0.0492

0.9567

1.1535

-

-

-

0.8835

DocID027887 Rev 2

STPA008 Package information

Ref

Table 8. Flexiwatt 25 (horizontal) package mechanical data (continued)

Dimensions

Millimeters Inches

(1)

Min.

Typ.

Max.

Min.

R1

R2

R3

R4

M2

N

P

R

V

V1

V2

V3

L5

L6

M

M1

L1

L2

(3)

L3

L4

10.15

15.50

7.70

-

5.15

1.80

2.75

-

-

-

3.20

-

-

-

-

-

10.5

15.70

7.85

5

5.45

1.95

3.00

4.73

5.61

2.20

3.50

1.70

0.50

0.30

1.25

0.50

5°

3°

20°

45°

10.85

15.90

7.95

-

-

-

-

-

3.80

-

-

5.85

2.10

3.50

-

-

1. Values in inches are converted from mm and rounded to 4 decimal digits.

2. dam-bar protusion not included.

3. molding protusion included.

-

-

-

-

-

-

0.1260

-

0.3996

0.6102

0.3031

-

0.2028

0.0709

0.1083

-

Typ.

0.2209

0.0866

0.1378

0.0669

0.0197

0.0118

0.0492

0.0197

0.4134

0.6181

0.3091

0.1969

0.2146

0.0768

0.1181

0.1862

5°

3°

20°

45°

Max.

-

-

-

-

-

-

0.1496

-

0.4272

0.6260

0.3130

-

0.2303

0.0827

0.1378

-

DocID027887 Rev 2

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28

Revision history STPA008

Date

18-May-2015

27-Jul-2015

Revision

Table 9. Document revision history

Changes

1

2

Initial release.

Updated:

Table 1: Device summary on page 1 ;

Table 4: Thermal data on page 10 ;

Section 4: General information

;

Section 5: Package information .

28/29

DocID027887 Rev 2

STPA008

IMPORTANT NOTICE – PLEASE READ CAREFULLY

STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, enhancements, modifications, and improvements to ST products and/or to this document at any time without notice. Purchasers should obtain the latest relevant information on

ST products before placing orders. ST products are sold pursuant to ST’s terms and conditions of sale in place at the time of order acknowledgement.

Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or the design of Purchasers’ products.

No license, express or implied, to any intellectual property right is granted by ST herein.

Resale of ST products with provisions different from the information set forth herein shall void any warranty granted by ST for such product.

ST and the ST logo are trademarks of ST. All other product or service names are the property of their respective owners.

Information in this document supersedes and replaces information previously supplied in any prior versions of this document.

© 2015 STMicroelectronics – All rights reserved

DocID027887 Rev 2 29/29

29