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STPA001
4 x 50 W MOSFET quad bridge power amplifier
Datasheet - production data
 Internally fixed gain (26 dB)
'!0'03
'!0'03
Flexiwatt27 (Vertical)
Flexiwatt27 (Horizontal)
'!0'03
Flexiwatt25 (Vertical)
'!0'03
Flexiwatt25 (Horizontal)
Features
 Multipower BCD technology
Description
 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.
The STPA001 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.
 MOSFET output power stage
 2 Ω driving capability
 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
 Protections:
– Output short circuit to GND, to Vs, across
the load
– Very inductive loads
– Overrating chip temperature with soft
thermal limiter
– Output DC offset detection
– Load dump
– Fortuitous open GND
– Reversed battery
– ESD
– Capable to operate down to 6 V (e.g.
“Startstop”)
The STPA001 can operate down to 6 V 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
STPA001
Flexiwatt25 (Vertical)
Tube
STPA001H
Flexiwatt25 (Horizontal)
Tube
STPA001A
Flexiwatt27 (Vertical)
Tube
STPA001AH
Flexiwatt27 (Horizontal)
Tube
October 2014
This is information on a product in full production.
DocID023043 Rev 7
1/26
www.st.com
Contents
STPA001
Contents
1
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1
2
3
4
Block diagram and application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1
Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2
Pin functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.2
Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.3
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.4
Electrical characteristics curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.1
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.2
Battery variations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.3
4.4
4.5
4.2.1
Low voltage operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.2.2
Cranks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.2.3
Advanced battery management (hybrid vehicles) . . . . . . . . . . . . . . . . . 17
Protections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.3.1
Short circuits and open circuit operation . . . . . . . . . . . . . . . . . . . . . . . . 18
4.3.2
Over-voltage and load dump protection . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.3.3
Thermal protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.4.1
DC offset detection (OD pin) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.4.2
Clipping detection and diagnostics (CD-DIAG pin) . . . . . . . . . . . . . . . . 19
Heat sink definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
2/26
DocID023043 Rev 7
STPA001
List of tables
List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Pin functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Document revision history. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
DocID023043 Rev 7
3/26
3
List of figures
STPA001
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.
Figure 30.
4/26
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Application circuit (STPA001) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Application circuit (STPA001A & STPA001H) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Quiescent current vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Output power vs. supply voltage (4 Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Output power vs. supply voltage (2 Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Distortion vs. output power (4 Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Distortion vs. frequency (4 Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Distortion vs. output power (4 Ω, Vs = 6 V). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Distortion vs. output power (2 Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Distortion vs. frequency (2 Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Distortion vs. output power (2 Ω, Vs = 6 V). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Supply voltage rejection vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Crosstalk vs. frequency. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Total power dissipation & efficiency vs. Po (4 Ω, Sine) . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Power dissipation vs. average output power (4 Ω, audio program simulation). . . . . . . . . . 14
Power dissipation vs. average output power (2 Ω, audio program simulation). . . . . . . . . . 14
ITU R-ARM frequency response, weighting filter for transient pop. . . . . . . . . . . . . . . . . . . 14
SVR charge diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Battery cranking curve example 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Battery cranking curve example 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Upwards fast battery transitions diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Load dump protection diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Thermal protection diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Audio section waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Flexiwatt27 (vertical) mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . 21
Flexiwatt27 (horizontal) mechanical data and package dimensions. . . . . . . . . . . . . . . . . . 22
Flexiwatt25 vertical mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . 23
Flexiwatt25 (horizontal) mechanical data and package dimensions. . . . . . . . . . . . . . . . . . 24
DocID023043 Rev 7
STPA001
1
Overview
Overview
The STPA001 is a complementary quad audio power amplifier. It is available in three
different packages, Flexiwatt25 (vertical), Flexiwatt25 (horizontal) and Flexiwatt27. It
embeds four independent amplifiers working in class AB, a standby and a mute pin, a
clipping detector and diagnostics output and, only for the Flexiwatt27 package, an offset
detector pin. The amplifier is fully operational down to a battery voltage of 6 V, without
producing pop noise and continuing to play during battery transitions.
The STPA001 can drive 2 Ω 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
6CC
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DocID023043 Rev 7
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25
Overview
STPA001
Figure 2. Application circuit (STPA001)
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DocID023043 Rev 7
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Pin description
Figure 4. Pin connection (top view)
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7/26
25
Pin description
2.2
STPA001
Pin functions
Table 2. Pin functions
Pin number Pin number
FW27
FW25
8/26
Pin name
Description
1
1
TAB
-
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
10
9
OUT1+
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+
19
18
PW-GND3
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, output power ground
26
n.a
CD-DIAG
Clipping detector and diagnostics output
27
n.a
TAB
Channel 2, output power ground
Supply voltage
Channel 1, negative output
Channel 1, output power ground
Channel 1, positive output
Signal ground
AC ground
Channel 3, positive output
Channel 3, output power ground
Channel 3, negative output
Supply voltage
-
DocID023043 Rev 7
STPA001
Electrical specifications
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
Ground pin voltage
-0.3 to 0.3
V
-0.3 to 8
V
-0.3 to Vs (pk)
V
-0.3 to 6
V
Value
Unit
1
°C/W
VS
IO
Ptot
GNDmax
Parameter
Vin max
Input pin max voltage
VSB max
ST-BY pin max voltage
Vmute max Mute pin max voltage
3.2
Thermal data
Table 4. Thermal data
Symbol
Rth j-case
Parameter
Thermal resistance junction-to-case
DocID023043 Rev 7
Max
9/26
25
Electrical specifications
3.3
STPA001
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
200
300
mA
Output offset voltage
Play mode / Mute mode
-90
-
+90
mV
-10
-
+10
mV
-15
-
+15
mV
40
55
70
kΩ
VSt-by = 1.2 V
-
-
20
μA
VSt-by = 0
-
-
10
μA
THD = 10 %
THD = 1 %
26
20
28
22
-
W
W
THD = 10 %, 2 Ω
THD = 1 %, 2 Ω
43
34
48
38
-
W
W
Max. output power
Square wave input (2 Vrms)
RL = 4 Ω
RL = 2 Ω
VS = 15.2 V; RL = 4 Ω
41
68
46
45
75
50
-
W
W
W
Distortion
Po = 4 W
-
0.007
0.05
%
Gv
Voltage gain
-
25
26
27
dB
dGv
Channel gain unbalance
-
-1
-
+1
dB
eNo
Output Noise
"A" Weighted
Bw = 20 Hz to 20 kHz
-
35
50
100
μV
μV
SVR
Supply voltage rejection
f = 100 Hz; Vr = 1 Vrms
50
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
60
-
75
60
-
dB
dB
AM
Mute attenuation
POref = 4 W
80
90
-
dB
-
-
1
μA
2.6
-
-
V
VOS
dVOS
During mute ON/OFF output offset
voltage
During standby ON/OFF output
offset voltage
Ri
Input impedance
ISB
Standby current consumption
ITU R-ARM weighted
-
Audio performances
Po
Po max.
THD
Output power
Control pin characteristics
Ipin5
VSB out
10/26
Standby pin current
VSt-by = 1.2 V to 2.6 V
Standby out threshold voltage
(Amp: ON)
DocID023043 Rev 7
STPA001
Electrical specifications
Table 5. Electrical characteristics (continued)
Symbol
Parameter
Test condition
Min.
Typ.
Max.
Unit
VSB in
Standby in threshold voltage
(Amp: OFF)
-
-
1.2
V
VM out
Mute out threshold voltage
(Amp: Play)
2.6
-
-
V
VM in
Mute in threshold voltage
(Amp: Mute)
-
-
1.2
V
(Amp: Mute)
Att  80 dB; POref = 4 W
4.5
5
5.5
V
(Amp: Play)
Att < 0.1 dB; PO = 0.5 W
-
-
6
V
VMUTE = 1.2 V
(Sourced current)
5
8
12
μA
VSt-by = 5 V
±1
±2
±3
V
Vo > ±3 V, Ioff Det = 1 mA
0 V < Voff Det < 18 V
-
0.1
0.2
V
Vo < ±1 V
-
0
15
μA
VAM in
Ipin23
VS automute threshold
Muting pin current
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
DC On; ICD = 1 mA
-
0.1
0.2
V
CDTHD
Clip detector THD level
VCC > 6.5 V
-
1
-
%
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25
Electrical specifications
3.4
STPA001
Electrical characteristics curves
Figure 5. Quiescent current vs. supply voltage Figure 6. Output power vs. supply voltage (4 Ω)
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5/ 7
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Figure 7. Output power vs. supply voltage (2 Ω)
3R:
Figure 8. Distortion vs. output power (4 Ω)
7+'
5/ 7
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9V 9
5/ 7
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Figure 9. Distortion vs. frequency (4 Ω)
7+'
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Figure 10. Distortion vs. output power
(4 Ω, Vs = 6 V)
7+'
9V 9
5/ 7
9V 9
5/ 7
3R :
I N +]
I N +]
I+]
'!0'03
12/26
DocID023043 Rev 7
3R:
'!0'03
STPA001
Electrical specifications
Figure 11. Distortion vs. output power (2 Ω)
Figure 12. Distortion vs. frequency (2 Ω)
7+'
7+'
9V 9
5/ 7
3R :
9 V 9
5/ 7
I N +]
I N +]
3R:
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Figure 13. Distortion vs. output power (2 Ω,
Vs = 6 V)
7+'
Figure 14. Supply voltage rejection vs.
frequency
695G%
9V 9
5/ 7
5J 7
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I N +]
I N +]
3R:
I+]
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Figure 15. Crosstalk vs. frequency
Figure 16. Total power dissipation & efficiency
vs. Po (4 Ω, Sine)
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9V 9
[ 5/ [7
I N+]
H
3GLVV:
5/ 7
3R :
5J 7
H
3GLVV
I+]
'!0'03
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3R:
'!0'03
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25
Electrical specifications
STPA001
Figure 17. Power dissipation vs. average output Figure 18. Power dissipation vs. average output
power (4 Ω, audio program simulation)
power (2 Ω, audio program simulation)
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STPA001
General information
4
General information
4.1
Operation
The STPA001's inputs are ground-compatible. If the standard value for the input capacitors
(0.22 μF) is adopted, the low frequency cut-off will amount to 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 (STPA001)).
Standby and mute pins are both 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 muting and stand-by functions are not used, they could steadily be connected to VS,
but a 470 kΩ resistance should be present between the power supply and the pins.
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. However, 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
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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 helps the supply voltage ripple rejection

it is used as a reference to generate the half supply voltage for the output
When the amplifier goes in standby mode or goes out from this condition, it is suggested 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 capacitance on SVR pin is
discharged or charged consequently.
4.2
Battery variations
4.2.1
Low voltage operation
The most recent OEM specifications are require automatic stop of car engine at traffic lights,
in order to reduce emissions of polluting substances. The STPA001, thanks to its innovating
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General information
STPA001
design, allows a continuous operation when battery falls down. At 6 V it is still fully
operational, only the maximum output power is reduced accordingly 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
STPA001 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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STPA001
4.2.3
General information
Advanced battery management (hybrid vehicles)
In addition to compatibility with low Vbatt, the STPA001 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. In fact, in hybrid vehicles, the
engine ignition causes a fast increase of battery voltage which can reach 16 V in less than
10 ms.
Figure 23. Upwards fast battery transitions diagram
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General information
STPA001
4.3
Protections
4.3.1
Short circuits and open circuit operation
When the IC detects a short circuit to ground, to Vs or across the load, the output of the
amplifier is put in three-state (high impedance condition). The power stage remains in this
condition until the short is removed.
In case of short circuit to ground or Vcc, the amplifier exits from the three-state condition
only when 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 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 damage 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 is switched to a high impedance
state. It stops to 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 lower than 5 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 reaches 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 reaches the maximum temperature
of 170 °C.
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Figure 25. Thermal protection diagram
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STPA001
General information
4.4
Warnings
4.4.1
DC offset detection (OD pin)
The STPA001 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. Thanks to a particular internal circuitry, the clip detector is always functional till
6.5 V.
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
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General information
4.5
STPA001
Heat sink definition
Assuming we have a maximum dissipated power 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.
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STPA001
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.
Figure 27. Flexiwatt27 (vertical) mechanical data and package dimensions
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STPA001
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Package information
Figure 29. Flexiwatt25 vertical mechanical data and package dimensions
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Figure 30. Flexiwatt25 (horizontal) mechanical data and package dimensions
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6
Revision history
Revision history
Table 6. Document revision history
Date
Revision
Changes
03-Apr-2012
1
Initial release.
10-Sep-2012
2
Updated Table 3: Absolute maximum ratings on page 9.
14-Nov-2012
3
Updated:
Features on page 1;
Section 1.1: Block diagram and application circuit;
Section 3.3: Electrical characteristics;
Section 4.4.2: Clipping detection and diagnostics (CD-DIAG pin) on
page 19;
Added Section 3.4: Electrical characteristics curves.
05-Sep-2013
4
Updated Figure 17 & 18.
18-Sep-2013
5
Updated Disclaimer.
05-Sep-2014
6
Updated Table 1: Device summary on page 1.
Added Figure 30: Flexiwatt25 (horizontal) mechanical data and
package dimensions on page 24.
27-Oct-2014
7
Updated Table 1: Device summary on page 1.
Added Figure 28: Flexiwatt27 (horizontal) mechanical data and
package dimensions on page 22
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STPA001
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