stpa008

STPA008
4 x 50 W MOSFET quad bridge power amplifier
Datasheet - production data
)OH[LZDWW
– Overrating chip temperature with soft
thermal limiter
– Output DC offset detection
– Load dump
– Fortuitous open GND
– Reversed battery
– ESD
)OH[LZDWW
YHUWLFDO
 Qualification in accordance to AEC Q100
standard
)OH[LZDWW
KRUL]RQWDO
Description
*$3*36
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.
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
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.
 Low output noise
Table 1. Device summary
 High immunity to RF noise injection
 Standby function
 Mute function
Order code
Package
Packing
STPA008-4WX
Flexiwatt25
(vertical)
Tube
STPA008-QIX
Flexiwatt25
(horizontal)
Tube
STPA008-48X
Flexiwatt27
Tube
 Automute at min. supply voltage detection
 Low external component count
 Internally fixed gain (26 dB)
 Protections:
– Output short circuit to GND, to Vs, across
the load
– Very inductive loads
July 2015
This is information on a product in full production.
DocID027887 Rev 2
1/29
www.st.com
Contents
STPA008
Contents
1
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.1
2
3
4
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
4.3
4.4
4.5
5
2/29
Block diagram and application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.2.1
Low voltage operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.2.2
Cranks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.2.3
Advanced battery management (hybrid vehicles) . . . . . . . . . . . . . . . . . 18
Protections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.3.1
Short circuits and open load operation . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.3.2
Over-voltage and load dump protection . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.3.3
Thermal protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.4.1
DC offset detection (OD pin) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.4.2
Clipping detection and diagnostics (CD-DIAG pin) . . . . . . . . . . . . . . . . 20
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
DocID027887 Rev 2
STPA008
6
Contents
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.
4/29
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
DocID027887 Rev 2
STPA008
List of figures
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
Figure 15.
Figure 16.
Figure 17.
Figure 18.
Figure 19.
Figure 20.
Figure 21.
Figure 22.
Figure 23.
Figure 24.
Figure 25.
Figure 26.
Figure 27.
Figure 28.
Figure 29.
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
Distortion vs. frequency (4 Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Distortion vs. frequency (2 Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Distortion vs. output power (4 Ω, VS = 6 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Distortion vs. output power (2 Ω, VS = 6 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Supply voltage rejection vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Crosstalk vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Total power dissipation & efficiency vs. Po (4 Ω, Sine) . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Power dissipation vs. average Output Power (4 Ω, audio program simulation) . . . . . . . . . 15
Power dissipation vs. average Output Power (2 Ω, audio program simulation) . . . . . . . . . 15
ITU R-ARM frequency response, weighting filter for transient pop. . . . . . . . . . . . . . . . . . . 15
SVR charge diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Battery cranking curve example 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Battery cranking curve example 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Upwards fast battery transitions diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Load dump protection diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Thermal protection diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Audio section waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Flexiwatt 27 (vertical) package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Flexiwatt 25 (vertical) package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Flexiwatt 25 (horizontal) package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
DocID027887 Rev 2
5/29
5
Overview
1
STPA008
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
6CC
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DocID027887 Rev 2
STPA008
Overview
Figure 2. Application circuit (STPA008-4WX)
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DocID027887 Rev 2
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STPA008
Figure 4. Pin connection (top view)
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STPA008
2.2
Pin description
Pin functions
Table 2. Pin functions
Pin number Pin number
FW27
FW25
Pin name
Description
1
1
TAB
Device slug connection
2
25
OD
Offset detector output
3
2
PW-GND2
4
3
OUT2-
Channel 2, negative output
5
4
ST-BY
Stand-by
6
5
OUT2+
Channel 2, positive output
7
6
VCC
8
7
OUT1-
9
8
PW-GND1
Channel 1, power ground
10
9
OUT1+
Channel 1, positive output
11
10
SVR
Supply voltage rejection pin
12
11
IN1
Channel 1, input
13
12
IN2
Channel 2, input
14
13
S-GND
15
14
IN4
Channel 4, input
16
15
IN3
Channel 3, input
17
16
AC-GND
18
17
OUT3+
Channel 3, positive output
19
18
PW-GND3
Channel 3, power ground
20
19
OUT3-
21
20
VCC
22
21
OUT4+
Channel 4, positive output
23
22
MUTE
Mute pin
24
23
OUT4-
Channel 4, negative output
25
24
PW-GND4
Channel 4, power ground
26
n.a
CD-DIAG
Clipping detector and diagnostics output
27
n.a
TAB
Channel 2, power ground
Supply voltage
Channel 1, negative output
Signal ground
AC ground
Channel 3, negative output
Supply voltage
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
Value
Unit
Operating supply voltage
18
V
VS (DC)
DC supply voltage
28
V
VS (pk)
Peak supply voltage (for t = 50 ms)
50
V
Output peak current
Non repetitive (t = 100 μs)
Repetitive (duty cycle 10 % at f = 10 Hz)
10
9
A
A
Power dissipation Tcase = 70 °C
85
W
Tj
Junction temperature
150
°C
Tstg
Storage temperature
-55 to 150
°C
GNDmax
Ground pins voltage
-0.3 to 0.3
V
Vin max
Input pin max voltage
-0.3 to 8
V
VSB max
ST-BY pin max voltage
-0.3 to Vs (pk)
V
-0.3 to 6
V
Value
Unit
1
°C/W
VS
IO
Ptot
Parameter
Vmute max Mute pin max voltage
3.2
Thermal data
Table 4. Thermal data
Symbol
Rth j-case
10/29
Parameter
Thermal resistance junction-to-case
DocID027887 Rev 2
Max
STPA008
3.3
Electrical specifications
Electrical characteristics
Refer to the test and application diagram, VS = 14.4 V; RL = 4 Ω; Rg = 600 Ω; f = 1 kHz;
Tamb = 25 °C; unless otherwise specified.
Table 5. Electrical characteristics
Symbol
Parameter
Test condition
Min.
Typ.
Max.
Unit
6
-
18
V
General characteristics
VS
Supply voltage range
-
Iq1
Quiescent current
RL = ∞
100
190
280
mA
Play mode
-90
-
+90
mV
Mute mode
-70
-
+70
mV
-7.5
-
+7.5
mV
-7.5
-
+7.5
mV
45
55
65
kΩ
VSt-by = 1 V
-
-
2
μA
VSt-by = 0
-
-
1
μA
THD = 10 %
THD = 1 %
26
20
29
23
-
W
W
THD = 10 %, 2 Ω
THD = 1 %, 2 Ω
45
37
50
40
-
W
W
Max. output power
Square wave input (2 Vrms)
RL = 4 Ω
RL = 2 Ω
VS = 15.2 V; RL = 4 Ω
42
71
47
45
77
50
-
W
W
W
Distortion
Po = 4 W, 30kHz LPF
-
0.01
0.02
%
Gv
Voltage gain
-
25
26
27
dB
dGv
Channel gain unbalance
-
-0.5
-
+0.5
dB
eNo
Output Noise
"A" Weighted
Bw = 20 Hz to 20 kHz
-
40
50
70
μV
μV
SVR
Supply voltage rejection
f = 100 kHz; Vr = 1 Vrms, play
mode
60
70
-
dB
fch
High cut-off frequency
PO = 0.5 W
100
300
-
kHz
CT
Cross talk
f = 1 kHz PO = 4 W
f = 10 kHz PO = 4 W
65
50
75
60
-
dB
dB
AM
Mute attenuation
POref = 4 W
90
100
-
dB
VOS
dVOS
Output offset voltage
During standby ON/OFF output
transient voltage
During mute ON/OFF output
transient voltage
Ri
Input impedance
ISB
Standby current consumption
ITU R-ARM weighted
(see Figure 19)
-
Audio performances
Po
Po max.
THD
Output power
DocID027887 Rev 2
11/29
28
Electrical specifications
STPA008
Table 5. Electrical characteristics (continued)
Symbol
Parameter
Test condition
Min.
Typ.
Max.
Unit
-
-
0.5
μA
Control pin characteristics
Ipin5
Standby pin current
VSt-by = 1 V to 2.2 V
VSB out
Standby out threshold voltage
(Amp: ON)
2.2
-
-
V
VSB in
Standby in threshold voltage
(Amp: OFF)
-
-
1
V
VM out
Mute out threshold voltage
(Amp: Play)
2.2
-
-
V
VM in
Mute in threshold voltage
(Amp: Mute)
-
-
0.8
V
VAM in
VS automute threshold
Attenuation = 6 dB;
POref = 4 W
4.5
5
5.5
V
Ipin23
Muting pin current
VMUTE = 0.8 V
(Sourced current)
5
8
12
μA
±1.3
±2
±2.7
V
Vo > VOFF max, Ioff Det = 1 mA
0 V < Voff Det < 18 V
-
0.1
0.2
V
Vo < ±1 V
-
0
15
μA
Offset detector
VOFF
Detected differential output offset
VOFF_SAT Off detector saturation voltage
VOFF_LK
Off detector leakage current
-
Clipping detector
CDLK
Clip detector high leakage current
CD Off
-
0
1
μA
CDSAT
Clip detector saturation voltage
CD On; ICD = 1 mA
-
0.1
0.2
V
CDTHD
Clip detector THD level
-
-
2
3
%
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)
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Figure 10. Distortion vs. frequency (4 Ω)
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*$3*36
DocID027887 Rev 2
*$3*36
13/29
28
Electrical specifications
STPA008
Figure 11. Distortion vs. frequency (2 Ω)
Figure 12. Distortion vs. output power
(4 Ω, VS = 6 V)
7+'
7+'
9V 9
5/ Ÿ
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9V 9
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Figure 13. Distortion vs. output power
(2 Ω, VS = 6 V)
7+'
Figure 14. Supply voltage rejection vs.
frequency
9V 9
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Figure 15. Crosstalk vs. frequency
Figure 16. Total power dissipation & efficiency
vs. Po (4 Ω, Sine)
3GLVV:
5/ Ÿ
3R :
5J Ÿ
Ș
9V 9
5/ [ȍ
I .+]
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3GLVV
I+]
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14/29
*$3*36
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DocID027887 Rev 2
3R:
*$3*36
STPA008
Electrical specifications
Figure 17. Power dissipation vs. average
Output Power (4 Ω, audio program simulation)
Figure 18. Power dissipation vs. average
Output Power (2 Ω, audio program simulation)
3GLVV:
9V 9
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9V 9
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3GLVV:
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3RDYJ:
3RDYJ:
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Figure 19. ITU R-ARM frequency response, weighting filter for transient pop
/UTPUTATTENUATIOND"
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DocID027887 Rev 2
'!0'03
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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 VS, but a 470
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 -2VBE 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
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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 VCC/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
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
9EDWW9
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9
9
W
W
W
W W
W
W
WV
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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
9EDWW 9
9
9
9
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W
W
W
W
WV
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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
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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
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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
66DUMP
66CC
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MS
'!0'03
Thermal protection
If the junction temperature of the IC overcomes Tj = 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
/UTPUTPOWER
4.3.3
#
*UNCTIONTEMPERATURE #
DocID027887 Rev 2
#
'!0'03
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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 Tj exceeds 140 °C, it is pulled
down to notify this occurrence.
Figure 26. Audio section waveforms
34"90).
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'!0'03
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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 Tj 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 RTh 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
5
STPA008
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
#
"
6
(
(
6
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/
(
2
,
2
6
2
,
.
,
2
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6
6
2
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0IN
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2
2
2
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-
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-
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Table 6. Flexiwatt 27 (vertical) package mechanical data
Dimensions
Ref
22/29
Inches(1)
Millimeters
Min.
Typ.
Max.
Min.
Typ.
Max.
A
4.45
4.50
4.65
0.1752
0.1772
0.1831
B
1.80
1.90
2.00
0.0709
0.0748
0.0787
C
-
1.40
-
-
0.0551
-
D
0.75
0.90
1.05
0.0295
0.0354
0.0413
DocID027887 Rev 2
STPA008
Package information
Table 6. Flexiwatt 27 (vertical) package mechanical data (continued)
Dimensions
Ref
Inches(1)
Millimeters
Min.
Typ.
Max.
Min.
Typ.
Max.
0.37
0.39
0.42
0.0146
0.0154
0.0165
-
-
0.57
-
-
0.0224
G
0.80
1.00
1.20
0.0315
0.0394
0.0472
G1
25.75
26.00
26.25
1.0138
1.0236
1.0335
(3)
28.90
29.23
29.30
1.1378
1.1508
1.1535
H1
-
17.00
-
-
0.6693
-
H2
-
12.80
-
-
0.5039
-
H3
-
0.80
-
-
0.0315
-
22.07
22.47
22.87
0.8689
0.8846
0.9004
18.57
18.97
19.37
0.7311
0.7469
0.7626
15.50
15.70
15.90
0.6102
0.6181
0.6260
L3
7.70
7.85
7.95
0.3031
0.3091
0.3130
L4
-
5
-
-
0.1969
-
L5
3.35
3.5
3.65
0.1319
0.1378
0.1437
M
3.70
4.00
4.30
0.1457
0.1575
0.1693
M1
3.60
4.00
4.40
0.1417
0.1575
0.1732
N
-
2.20
-
-
0.0866
-
O
-
2
-
-
0.0787
-
R
-
1.70
-
-
0.0669
-
R1
-
0.5
-
-
0.0197
-
R2
-
0.3
-
-
0.0118
-
R3
-
1.25
-
-
0.0492
-
R4
-
0.50
-
-
0.0197
-
E
F
(2)
H
(3)
L
L1
L2
(3)
V
5°
5°
V1
3°
3°
V2
20°
20°
V3
45°
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
5.2
STPA008
Flexiwatt 25 (vertical) package information
Figure 28. Flexiwatt 25 (vertical) package outline
9
&
%
9
+
+
9
$
+
2
+
5
/
5
9
5
/
1
/
5
/
/
9
9
5
5
/
3LQ
'
5
5
(
*
*
)
0
0
*$3*36
B)B:
Table 7. Flexiwatt 25 (vertical) package mechanical data
Dimensions
Ref
Min.
Typ.
Max.
Min.
Typ.
Max.
A
4.45
4.50
4.65
0.1752
0.1772
0.1831
B
1.80
1.90
2.00
0.0709
0.0748
0.0787
C
-
1.40
-
-
0.0551
-
D
0.75
0.90
1.05
0.0295
0.0354
0.0413
E
0.37
0.39
0.42
0.0146
0.0154
0.0165
F(2)
-
-
0.570
-
-
0.0224
G
0.80
1.00
1.20
0.0315
0.0394
0.0472
G1
23.75
24.00
24.25
0.9350
0.9449
0.9547
(3)
28.90
29.23
29.30
1.1378
1.1508
1.1535
H1
-
17.00
-
-
0.6693
-
H2
-
12.80
-
-
0.5039
-
H3
-
0.80
-
-
0.0315
-
H
24/29
Inches(1)
Millimeters
DocID027887 Rev 2
STPA008
Package information
Table 7. Flexiwatt 25 (vertical) package mechanical data (continued)
Dimensions
Ref
Inches(1)
Millimeters
Min.
Typ.
Max.
Min.
Typ.
Max.
L(3)
22.07
22.47
22.87
0.8689
0.8846
0.9004
L1
18.57
18.97
19.37
0.7311
0.7469
0.7626
15.50
15.70
15.90
0.6102
0.6181
0.6260
L3
7.70
7.85
7.95
0.3031
0.3091
0.3130
L4
-
5.00
-
-
0.1969
-
L5
3.35
3.50
3.65
0.1319
0.1378
0.1437
M
3.70
4.00
4.30
0.1457
0.1575
0.1693
M1
3.60
4.00
4.40
0.1417
0.1575
0.1732
N
-
2.20
-
-
0.0866
-
O
-
2.00
-
-
0.0787
-
R
-
1.70
-
-
0.0669
-
R1
-
0.50
-
-
0.0197
-
R2
-
0.30
-
-
0.0118
-
R3
-
1.25
-
-
0.0492
-
R4
-
0.50
-
-
0.0197
-
L2
(3)
V
5°
5°
V1
3°
3°
V2
20°
20°
V3
45°
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
5.3
STPA008
Flexiwatt 25 (horizontal) package information
Figure 29. Flexiwatt 25 (horizontal) package outline
9
%
&
9
+
9
'
+
+
+
$
5
5
/
/
9
5
/
/
9
1
5
0
*
*
)
3
(
5
0
5
/
/
/
9
0
*$3*36
B'B4,
Table 8. Flexiwatt 25 (horizontal) package mechanical data
Dimensions
Ref
Min.
Typ.
Max.
Min.
Typ.
Max.
A
4.45
4.50
4.65
0.1752
0.1772
0.1831
B
1.80
1.90
2.00
0.0709
0.0748
0.0787
C
-
1.40
-
-
0.0551
-
D
-
2.00
-
-
0.0787
-
E
0.37
0.39
0.42
0.0146
0.0154
0.0165
-
-
0.57
-
-
0.0224
G
0.75
1.00
1.25
0.0295
0.0394
0.0492
G1
23.70
24.00
24.30
0.9331
0.9449
0.9567
(3)
28.90
29.23
29.30
1.1378
1.1508
1.1535
H1
-
17.00
-
-
0.6693
-
H2
-
12.80
-
-
0.5039
-
H3
-
0.80
-
-
0.0315
-
L
21.64
22.04
22.44
0.8520
0.8677
0.8835
F
(2)
H
26/29
Inches(1)
Millimeters
DocID027887 Rev 2
STPA008
Package information
Table 8. Flexiwatt 25 (horizontal) package mechanical data (continued)
Dimensions
Ref
Inches(1)
Millimeters
Min.
Typ.
Max.
Min.
Typ.
Max.
10.15
10.5
10.85
0.3996
0.4134
0.4272
15.50
15.70
15.90
0.6102
0.6181
0.6260
L3
7.70
7.85
7.95
0.3031
0.3091
0.3130
L4
-
5
-
-
0.1969
-
L5
5.15
5.45
5.85
0.2028
0.2146
0.2303
L6
1.80
1.95
2.10
0.0709
0.0768
0.0827
M
2.75
3.00
3.50
0.1083
0.1181
0.1378
M1
-
4.73
-
-
0.1862
-
M2
-
5.61
-
-
0.2209
-
N
-
2.20
-
-
0.0866
-
P
3.20
3.50
3.80
0.1260
0.1378
0.1496
R
-
1.70
-
-
0.0669
-
R1
-
0.50
-
-
0.0197
-
R2
-
0.30
-
-
0.0118
-
R3
-
1.25
-
-
0.0492
-
R4
-
0.50
-
-
0.0197
-
L1
L2
(3)
V
5°
5°
V1
3°
3°
V2
20°
20°
V3
45°
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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Revision history
6
STPA008
Revision history
Table 9. Document revision history
28/29
Date
Revision
Changes
18-May-2015
1
Initial release.
27-Jul-2015
2
Updated:Table 1: Device summary on page 1; Table 4: Thermal data
on page 10; Section 4: General information; Section 5: Package
information.
DocID027887 Rev 2
STPA008
IMPORTANT NOTICE – PLEASE READ CAREFULLY
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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
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