STPA008_技术文档

STPA008

4 x 50 W MOSFET quad bridge power amplifier

Datasheet - production data

– Overrating chip temperature with soft

thermal limiter

– Output DC offset detection

– Load dump

)OH[LZDWWꢀꢁ

)OH[LZDWWꢀꢂꢃ

ꢄYHUWLFDOꢅ

– Fortuitous open GND

– Reversed battery

– ESD

 Qualification in accordance to AEC Q100

standard

)OH[LZDWWꢀꢂ

ꢄKRUL]RQWDOꢅ

Description

*$3*ꢀꢁꢂꢁꢃꢄꢃꢂꢄꢁ36

STPA008 is a breakthrough MOSFET technology

class AB audio power amplifier designed for high

power car radio. The fully complementary

Features

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.

 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

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.

 Capable to operate down to 6 V (suitable for

start-stop car operation)

 Excellent GSM noise immunity

 Hi-Fi class distortion

 Low output noise

Table 1. Device summary

 High immunity to RF noise injection

 Standby function

Order code

Package

Packing

Flexiwatt25

(vertical)

 Mute function

STPA008-4WX

Tube

 Automute at min. supply voltage detection

 Low external component count

 Internally fixed gain (26 dB)

 Protections:

Flexiwatt25

(horizontal)

STPA008-QIX

STPA008-48X

Tube

Flexiwatt27

– Output short circuit to GND, to V , across

s

the load

– Very inductive loads

July 2015

DocID027887 Rev 2

1/29

This is information on a product in full production.

www.st.com

Contents

STPA008

Contents

1

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

1.1

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

2

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

2.1

2.2

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

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

3

4

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

3.1

3.2

3.3

3.4

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

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

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

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

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

4.1

4.2

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

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

4.5

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

4.4.1

4.4.2

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

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

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

5

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

5.1

5.2

5.3

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

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

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

2/29

DocID027887 Rev 2

STPA008

Contents

6

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

DocID027887 Rev 2

3/29

3

List of tables

STPA008

List of tables

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

Figure 1.

Figure 2.

Figure 3.

Figure 4.

Figure 5.

Figure 6.

Figure 7.

Figure 8.

Figure 9.

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

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

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

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

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

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

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

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

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. Distortion vs. output power (4 Ω, V = 6 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

S

Figure 13. Distortion vs. output power (2 Ω, V = 6 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

S

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

Figure 15. Crosstalk vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 16. Total power dissipation & efficiency vs. P (4 Ω, Sine) . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

o

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

STPA008

1

Overview

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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6/29

DocID027887 Rev 2

STPA008

Overview

Figure 2. Application circuit (STPA008-4WX)

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DocID027887 Rev 2

7/29

28

Pin description

STPA008

2

Pin description

2.1

Pin connection

Figure 4. Pin connection (top view)

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8/29

DocID027887 Rev 2

STPA008

Pin description

2.2

Pin functions

Table 2. Pin functions

Pin number Pin number

Pin name

Description

FW27

FW25

1

25

2

TAB

OD

Device slug connection

2

Offset detector output

Channel 2, power ground

Channel 2, negative output

Stand-by

3

PW-GND2

OUT2-

ST-BY

OUT2+

VCC

4

3

5

4

6

5

Channel 2, positive output

Supply voltage

7

6

8

7

OUT1-

PW-GND1

OUT1+

SVR

Channel 1, negative output

Channel 1, power ground

Channel 1, positive output

Supply voltage rejection pin

Channel 1, input

9

8

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

n.a

IN1

IN2

Channel 2, input

S-GND

IN4

Signal ground

Channel 4, input

IN3

Channel 3, input

AC-GND

OUT3+

PW-GND3

OUT3-

VCC

AC ground

Channel 3, positive output

Channel 3, power ground

Channel 3, negative output

Supply voltage

OUT4+

MUTE

OUT4-

PW-GND4

CD-DIAG

TAB

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

Electrical specifications

3.1

Absolute maximum ratings

Table 3. Absolute maximum ratings

Symbol

Parameter

Operating supply voltage

Value

Unit

V_S

18

28

50

V

V_{S (DC)}DC supply voltage

V_{S (pk)}

Peak supply voltage (for t = 50 ms)

Output peak current

I_O

Non repetitive (t = 100 μs)

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

10

9

A

P_tot

T_j

Power dissipation T_case= 70 °C

Junction temperature

85

W

°C

V

150

T_stg

Storage temperature

-55 to 150

-0.3 to 0.3

-0.3 to 8

-0.3 to V_{s (pk)}

-0.3 to 6

GND_maxGround pins voltage

V_{in max}Input pin max voltage

V_{SB max}ST-BY pin max voltage

V_{mute max}Mute pin max voltage

V

3.2

Thermal data

Table 4. Thermal data

Symbol

Parameter

Value

Unit

R_{th j-case}Thermal resistance junction-to-case

Max

1

°C/W

10/29

DocID027887 Rev 2

STPA008

Electrical specifications

3.3

Electrical characteristics

Refer to the test and application diagram, V_S= 14.4 V; R_L= 4 Ω; R_g= 600 Ω; f = 1 kHz;

T_amb= 25 °C; unless otherwise specified.

Table 5. Electrical characteristics

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

General characteristics

V_S

I_q1

Supply voltage range

-

6

-

18

V

Quiescent current

R_L= ∞

100

-90

-70

190

280

+90

+70

mA

mV

Play mode

Mute mode

-

V_OS

Output offset voltage

During standby ON/OFF output

transient voltage

-7.5

-

+7.5

mV

ITU R-ARM weighted

dV_OS

(see Figure 19)

During mute ON/OFF output

transient voltage

R_i

Input impedance

-

45

-

55

-

65

2

kΩ

μA

V_St-b_y= 1 V

V_St-b_y= 0

I_SB

Standby current consumption

-

1

Audio performances

THD = 10 %

THD = 1 %

26

20

29

23

-

W

P_o

Output power

THD = 10 %, 2 Ω

THD = 1 %, 2 Ω

45

37

50

40

-

W

Square wave input (2 Vrms)

R_L= 4 Ω

42

71

47

45

77

50

-

W

P_{o max.}Max. output power

R_L= 2 Ω

V_S= 15.2 V; R_L= 4 Ω

THD

G_v

Distortion

P_o= 4 W, 30kHz LPF

-

0.01

26

-

0.02

27

%

Voltage gain

-

25

dB

dG_v

Channel gain unbalance

-0.5

+0.5

"A" Weighted

-

40

50

-

μV

e_No

Output Noise

Bw = 20 Hz to 20 kHz

70

f = 100 kHz; V_r= 1 Vrms, play

mode

SVR

f_ch

Supply voltage rejection

High cut-off frequency

Cross talk

60

70

-

dB

P_O= 0.5 W

100

300

kHz

f = 1 kHz P_O= 4 W

f = 10 kHz P_O= 4 W

65

50

75

60

-

dB

C_T

A_M

Mute attenuation

P_Oref= 4 W

90

100

-

dB

DocID027887 Rev 2

11/29

28

Electrical specifications

STPA008

Table 5. Electrical characteristics (continued)

Test condition

Symbol

Parameter

Min.

Typ.

Max.

Unit

Control pin characteristics

I_pin5

Standby pin current

V_St-by= 1 V to 2.2 V

(Amp: ON)

-

2.2

-

0.5

-

μA

V

V_{SB out}Standby out threshold voltage

V_{SB in}

V_{M out}

V_{M in}

Standby in threshold voltage

Mute out threshold voltage

Mute in threshold voltage

(Amp: OFF)

1

V

(Amp: Play)

2.2

-

V

(Amp: Mute)

0.8

V

Attenuation = 6 dB;

V_{AM in}

Ipin23

V_Sautomute threshold

Muting pin current

4.5

5

8

5.5

12

V

P_Oref= 4 W

V_MUTE= 0.8 V

μA

(Sourced current)

Offset detector

V_OFF

Detected differential output offset

-

±1.3

±2

0.1

0

±2.7

0.2

15

V

V_o> V_{OFF max}, I_{off Det}= 1 mA

0 V < V_{off Det}< 18 V

V_{OFF_SAT}Off detector saturation voltage

-

V_{OFF_LK}Off detector leakage current

V_o< ±1 V

μA

Clipping detector

CD_LK

Clip detector high leakage current CD Off

-

0

0.1

2

1

0.2

3

μA

V

CD_SATClip detector saturation voltage

CD_THDClip detector THD level

CD On; I_CD= 1 mA

-

%

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 9. Distortion vs. output power (2 Ω)

Figure 10. Distortion vs. frequency (4 Ω)

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DocID027887 Rev 2

13/29

28

Electrical specifications

STPA008

Figure 11. Distortion vs. frequency (2 Ω)

Figure 12. Distortion vs. output power

(4 Ω, V = 6 V)

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Figure 13. Distortion vs. output power

Figure 14. Supply voltage rejection vs.

frequency

(2 Ω, V = 6 V)

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Figure 15. Crosstalk vs. frequency

Figure 16. Total power dissipation & efficiency

vs. P (4 Ω, Sine)

o

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14/29

DocID027887 Rev 2

STPA008

Electrical specifications

Figure 17. Power dissipation vs. average

Figure 18. Power dissipation vs. average

Output Power (4 Ω, audio program simulation) Output Power (2 Ω, audio program simulation)

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

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DocID027887 Rev 2

15/29

28

General information

STPA008

4

General information

4.1

Operation

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

μF) 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 , but a 470

S

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

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 μF. To have a fast start-up time, the

internal resistor on SVR pin, used to set the time constant, is reduced from 50 kΩ to 3 kΩ till

voltage on SVR reaches VCC/4 -2V and then released. In this way the capacitor on SVR

BE

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

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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 /2 reference for the outputs

CC

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

Battery variations

4.2.1

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

16/29

DocID027887 Rev 2

STPA008

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.

4.2.2

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

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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

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V1 = 16 V; V2 = 6 V; V3 = 7 V

t1 = 2 ms; t2 = 5 ms; t3 = 15 ms; t5 = 1 s; t6 = 50 ms

DocID027887 Rev 2

17/29

28

General information

STPA008

4.2.3

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

'!0'03ꢀꢀꢁꢂꢁ

18/29

DocID027887 Rev 2

STPA008

General information

4.3

Protections

4.3.1

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 μs. 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 μs.

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

play.

4.3.2

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

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4.3.3

Thermal protection

If the junction temperature of the IC overcomes T = 150 °C, a smooth mute is applied to

j

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

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DocID027887 Rev 2

19/29

28

General information

STPA008

4.4

Warnings

4.4.1

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.

4.4.2

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 exceeds 140 °C, it is pulled

j

down to notify this occurrence.

Figure 26. Audio section waveforms

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20/29

DocID027887 Rev 2

STPA008

General information

4.5

Heat sink definition

Assuming a power dissipation of 26 W (e.g. in the worst case situation of frequent clipping

occurrence), considering T max is 150°C and assuming ambient temperature is 70 °C, the

j

available temperature gap for a correct dissipation is 80 °C.

This means the thermal resistance of the system R has to be 80 °C/26 W = 3 °C/W.

Th

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

21/29

28

Package information

STPA008

5

Package information

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.

5.1

Flexiwatt 27 (vertical) package information

Figure 27. Flexiwatt 27 (vertical) package outline

6

#

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Table 6. Flexiwatt 27 (vertical) package mechanical data

Dimensions

Ref

Millimeters

Typ.

Inches⁽¹⁾

Typ.

Min.

Max.

Min.

Max.

A

B

C

D

4.45

1.80

-

4.50

1.90

1.40

0.90

4.65

2.00

-

0.1752

0.0709

-

0.1772

0.0748

0.0551

0.0354

0.1831

0.0787

-

0.75

1.05

0.0295

0.0413

22/29

DocID027887 Rev 2

STPA008

Package information

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

Dimensions

Ref

Millimeters

Typ.

Inches⁽¹⁾

Typ.

Min.

Max.

Min.

Max.

E

F⁽²⁾

G

0.37

0.39

-

0.42

0.0146

0.0154

-

0.0165

-

0.57

-

0.0224

0.80

1.00

26.00

29.23

17.00

12.80

0.80

22.47

18.97

15.70

7.85

5

1.20

0.0315

0.0394

1.0236

1.1508

0.6693

0.5039

0.0315

0.8846

0.7469

0.6181

0.3091

0.1969

0.1378

0.1575

0.0866

0.0787

0.0669

0.0197

0.0118

0.0492

0.0197

5°

0.0472

G1

H⁽³⁾

H1

H2

H3

L ⁽³⁾

L1

25.75

26.25

1.0138

1.0335

28.90

29.30

1.1378

1.1535

-

22.07

22.87

0.8689

0.9004

18.57

19.37

0.7311

0.7626

L2 ⁽³⁾

15.50

15.90

0.6102

0.6260

L3

7.70

7.95

0.3031

0.3130

L4

-

L5

3.35

3.5

3.65

0.1319

0.1437

M

3.70

4.00

2.20

2

4.30

0.1457

0.1693

M1

N

3.60

4.40

0.1417

0.1732

-

O

R

1.70

0.5

R1

R2

R3

R4

V

0.3

1.25

0.50

5°

V1

V2

V3

3°

20°

45°

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

2. dam-bar protusion not included.

3. molding protusion included.

DocID027887 Rev 2

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28

Package information

STPA008

5.2

Flexiwatt 25 (vertical) package information

Figure 28. Flexiwatt 25 (vertical) package outline

9

&

%

9

+

+ꢀ

9ꢊ

$

+ꢈ

5ꢊ

+ꢊ

5ꢉ

9ꢀ

5ꢈ

5

/

/ꢀ

9ꢀ

9ꢈ

'

5ꢈ

5ꢀ

0

5ꢀ

(

/ꢍ

3LQꢇꢀ

*

)

*ꢀ

0ꢀ

ꢂꢁꢊꢉꢃꢌꢈB)Bꢉ:ꢇꢇꢇꢇꢇꢇꢇꢇ

*$3*36ꢂꢉꢆꢄꢄ

Table 7. Flexiwatt 25 (vertical) package mechanical data

Dimensions

Ref

Millimeters

Typ.

Inches⁽¹⁾

Min.

Max.

Min.

Typ.

Max.

A

B

4.45

4.50

1.90

1.40

0.90

0.39

-

4.65

2.00

-

0.1752

0.1772

0.0748

0.0551

0.0354

0.0154

-

0.1831

0.0787

-

1.80

0.0709

C

-

D

0.75

1.05

0.42

0.570

1.20

24.25

29.30

-

0.0295

0.0413

0.0165

0.0224

0.0472

0.9547

1.1535

-

E

0.37

0.0146

F⁽²⁾

-

G

0.80

1.00

24.00

29.23

17.00

12.80

0.80

0.0315

0.0394

0.9449

1.1508

0.6693

0.5039

0.0315

G1

H⁽³⁾

H1

H2

H3

23.75

0.9350

28.90

1.1378

-

24/29

DocID027887 Rev 2

STPA008

Package information

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

Dimensions

Ref

Millimeters

Typ.

Inches⁽¹⁾

Typ.

Min.

Max.

Min.

Max.

L⁽³⁾

L1

L2⁽³⁾

L3

L4

L5

M

22.07

22.47

18.97

15.70

7.85

5.00

3.50

4.00

2.20

2.00

1.70

0.50

0.30

1.25

0.50

5°

22.87

0.8689

0.8846

0.7469

0.6181

0.3091

0.1969

0.1378

0.1575

0.0866

0.0787

0.0669

0.0197

0.0118

0.0492

0.0197

5°

0.9004

18.57

19.37

0.7311

0.7626

15.50

15.90

0.6102

0.6260

7.70

7.95

0.3031

0.3130

-

3.35

3.65

0.1319

0.1437

3.70

4.30

0.1457

0.1693

M1

N

3.60

4.40

0.1417

0.1732

-

O

R

R1

R2

R3

R4

V

V1

V2

V3

3°

20°

45°

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

2. dam-bar protusion not included.

3. molding protusion included.

DocID027887 Rev 2

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28

Package information

STPA008

5.3

Flexiwatt 25 (horizontal) package information

Figure 29. Flexiwatt 25 (horizontal) package outline

9

+

+ꢈ

$

+ꢀ

+ꢊ

0

0ꢀ

)

*

*ꢀ

0ꢈ

ꢂꢊꢄꢄꢂꢊꢊB'B4,

*$3*36ꢂꢉꢆꢄꢁ

Table 8. Flexiwatt 25 (horizontal) package mechanical data

Dimensions

Ref

Millimeters

Typ.

Inches⁽¹⁾

Typ.

Min.

Max.

Min.

Max.

A

B

4.45

4.50

1.90

1.40

2.00

0.39

-

4.65

2.00

-

0.1752

0.1772

0.0748

0.0551

0.0787

0.0154

-

0.1831

1.80

0.0709

0.0787

C

-

D

-

E

0.37

0.42

0.57

1.25

24.30

29.30

-

0.0146

0.0165

0.0224

0.0492

0.9567

1.1535

-

F⁽²⁾

-

0.75

23.70

28.90

-

G

1.00

24.00

29.23

17.00

12.80

0.80

22.04

0.0295

0.0394

0.9449

1.1508

0.6693

0.5039

0.0315

0.8677

G1

H⁽³⁾

H1

H2

H3

L

0.9331

1.1378

-

21.64

22.44

0.8520

0.8835

26/29

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STPA008

Package information

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

Dimensions

Ref

Millimeters

Typ.

Inches⁽¹⁾

Typ.

Min.

Max.

Min.

Max.

L1

L2⁽³⁾

L3

L4

L5

L6

M

10.15

10.5

15.70

7.85

5

10.85

0.3996

0.4134

0.6181

0.3091

0.1969

0.2146

0.0768

0.1181

0.1862

0.2209

0.0866

0.1378

0.0669

0.0197

0.0118

0.0492

0.0197

5°

0.4272

15.50

15.90

0.6102

0.6260

7.70

7.95

0.3031

0.3130

-

5.15

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°

5.85

0.2028

0.2303

1.80

2.10

0.0709

0.0827

2.75

3.50

0.1083

0.1378

M1

M2

N

-

P

3.20

3.80

0.1260

0.1496

R

-

R1

R2

R3

R4

V

V1

V2

V3

3°

20°

45°

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

2. dam-bar protusion not included.

3. molding protusion included.

DocID027887 Rev 2

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28

Revision history

STPA008

6

Revision history

Table 9. Document revision history

Changes

Date

Revision

18-May-2015

1

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.

27-Jul-2015

2

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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.

DocID027887 Rev 2

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29


型号：	STPA008
厂家：	ST
描述：	4 x 50 W MOSFET quad bridge power amplifier
文件：	总29页 (文件大小：598K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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