STMicroelectronics TDA7851A Datasheet
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TDA7851A
4 x 48 W MOSFET quad bridge power amplifier
Datasheet
production data
Features
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Multipower BCD technology
High output power capability:
– 4 x 48 W/4
Max.
– 4 x 28 W/4
@ 14.4 V, 1 kHz, 10 %
– 4 x 72 W/2
Max.
MOSFET output power stage
Excellent 2
driving capability
Hi-Fi class distortion
Low output noise
Standby function
Mute function
Automute at min. supply voltage detection
Low external component count:
– Internally fixed gain (26 dB)
– No external compensation
– No bootstrap capacitors
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 voltage
Table 1.
Device summary
Order code
TDA7851A
Package
Flexiwatt 27
Flexiwatt 27
'!0'03
– Fortuitous open GND
– Reversed battery
– ESD
Description
The TDA7851A 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. This, combined with high output current and minimized saturation losses, sets new power references in the car-radio field, with unparalleled distortion performance.
Packing
Tube
September 2013
This is information on a product in full production.
Doc ID 17715 Rev 3 1/15 www.st.com
1
Contents
Contents
TDA7851A
Block diagram and application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2/15 Doc ID 17715 Rev 3
TDA7851A
List of tables
List of tables
Doc ID 17715 Rev 3 3/15
List of figures
List of figures
TDA7851A
Output power vs. supply voltage (R
L
= 4
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Output power vs. supply voltage (R
L
= 2
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
= 4
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Distortion vs. output power (R
L
Distortion vs. output power (R
L
= 2
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
= 4
). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
= 2
). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Power dissipation and efficiency vs. output power (R
L
= 4
, SINE) . . . . . . . . . . . . . . . . . 10
Power dissipation and efficiency vs. output power (R
Power dissipation vs. output power (R
Power dissipation vs. output power (R
L
= 2
, SINE) . . . . . . . . . . . . . . . . . 10
= 4
, audio program simulation) . . . . . . . . . . . . 11
= 2
, audio program simulation) . . . . . . . . . . . . 11
4/15 Doc ID 17715 Rev 3
TDA7851A
1
Block diagram and application circuit
Block diagram and application circuit
Figure 1.
Block diagram
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Application circuit
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Doc ID 17715 Rev 3
'!0'03
5/15
Pin description
Figure 3.
Pin connection (top view )
TDA7851A
'!0'03
Table 2.
Symbol
Thermal data
Parameter
R th j-case
Thermal resistance junction-to-case Max
Value
1
Unit
°C/W
6/15 Doc ID 17715 Rev 3
TDA7851A Electrical specifications
3.1 Absolute maximum ratings
Table 3.
Symbol
V
S
V
S (DC)
V
S (pk)
Absolute maximum ratings
Parameter
Operating supply voltage
DC supply voltage
Peak supply voltage (for t = 50 ms)
I
O
P tot
T j
T stg
Output peak current
Non repetitive (t = 100 µs)
Repetitive (duty cycle 10 % at f = 10 Hz)
Power dissipation T case
= 70 °C
Junction temperature
Storage temperature
Value
18
28
50
10
9
85
150
-55 to 150
Unit
V
V
V
A
A
W
°C
°C
Refer to the test and application diagram, V
S
= 14.4 V; R
L
= 4
; R g
= 600
; f = 1 kHz;
T amb
= 25 °C; unless otherwise specified.
Table 4.
Symbol
V
S
I q1
V
OS dV
OS
G v dG v
P o
P o max.
THD
Electrical characteristics
Parameter Test condition
Supply voltage range
Quiescent current
Output offset voltage
Max. output power
Distortion
(1)
-
R
L
=
Play mode / Mute mode
During mute ON/OFF output offset voltage
During standby ON/OFF output offset voltage
ITU R-ARM weighted see
Voltage gain
Channel gain unbalance
-
-
V
S
= 14.4 V; THD = 10 %
V
S
= 14.4 V; THD = 1 %
V
S
= 14.4 V; THD = 10 %, 2
V
S
= 14.4 V; THD = 1 %, 2
V
S
= 14.4 V; R
L
= 4
V
S
= 14.4 V; R
L
V
S
= 15.2 V; R
L
= 2
= 4
P o
= 4 W
Min. Typ.
Max.
Unit
8
100
-60
-
150
-
18
300
+60
V mA mV
-10
-10
25
-
25
-
-
-
-
+10
+10
26
-
28
22
48
38
27
±1
-
-
45
75
48
-
0.01
0.05
mV mV dB dB
W
W
W
W
W
W
W
%
Doc ID 17715 Rev 3 7/15
Electrical specifications
Table 4.
Symbol
Electrical characteristics (continued)
Parameter Test condition
V
SVR
V
V
I e
SB out
V
I f ch
R i
C
SB pin5
SB in
A
No
T
M
M out
M in
Supply voltage rejection
High cut-off frequency
Input impedance
Cross talk
Standby current consumption
Standby pin current
Standby out threshold voltage
Standby in threshold voltage
Mute attenuation
Mute out threshold voltage
Mute in threshold voltage
"A" Weighted
Bw = 20 Hz to 20 kHz f = 100 Hz; V r
= 1 Vrms
-
P
O
= 0.5 W f = 1 kHz, P
O
= 4 W f = 10 kHz, P
O
= 4 W
V
St-by
= 1.2 V
V
St-by
= 0
V
St-by
= 1.2 V to 2.6 V
(Amp: ON)
(Amp: OFF)
P
Oref
= 4 W
(Amp: Play)
(Amp: Mute)
(Amp: Mute)
Att 80 dB; P
Oref
= 4 W
V
AM in
V
S
automute threshold
Ipin23 Muting pin current
(Amp: Play)
Att < 0.1 dB; P
O
= 0.5 W
V
MUTE
= 1.2 V
(Sourced current)
V
MUTE
= 2.6 V
Offset detector
V
OFF_SAT
V
V
OFF
OFF_LK
Detected differential output offset V
St-by
= 5 V
Off detector saturation voltage
Off detector leakage current
V o
> ±3 V, I off Det
= 1 mA
0 V < V off Det
< 18 V
V o
< ±1 V
Clipping detector
CD
LK
CD
SAT
CD
THD
Clip detector high leakage current
Clip detector saturation voltage
Clip detector THD level
1.
Saturated square wave output
-
Cd off
DC On; I
CD
= 1 mA
TDA7851A
50
100
70
60
-
80
2.6
-
-
-
-
2.6
Min. Typ.
Max.
Unit
-
µA
V
V dB
V
V
µV
µV dB kHz k
dB dB
µA
µA
20
10
±1
-
100
-
-
130
-
-
1.2
-
-
1.2
-
-
-
90
-
-
-
-
35
50
70
300
100
70
60
6.7
7 V
-
7
-5
7.5
12
-
8
18
18
V
µA
µA
±1
-
-
±2
0.2
0
±3
0.4
15
V
V
µA
-
-
-
0
0.2
2
1
0.4
-
µA
V
%
8/15 Doc ID 17715 Rev 3
TDA7851A Electrical specifications
Figure 4.
Quiescent current vs. supply voltage
)
D
M!
6
I
2
, c
Figure 5.
Output power vs. supply voltage
(R
L
= 4
)
0
O
7
2
,
7
F+(Z
0OMAX
4($
4($
6S6
'!0'03
Figure 6.
Output power vs. supply voltage
(R
L
= 2
)
0O7
6
S
6
Figure 7.
Distortion vs. output power
(R
L
= 4
)
4($
'!0'03
0OMAX
2
,
7
F+(Z
6
3
2
,
6
7
FK(Z
4($
4($
FK(Z
6
S
6
Figure 8.
Distortion vs. output power
(R
L
= 2
)
4($
'!0'03
0
O
7
Figure 9.
Distortion vs. frequency
(R
L
= 4
)
4($
6
S
6
2
,
7
6
2
S
0
O
6
7
,
7
F+(Z
'!0'03
F+(Z
0
O
7
F(Z
'!0'03
Doc ID 17715 Rev 3
'!0'03
9/15
Electrical specifications
Figure 10. Distortion vs. frequency
(R
L
= 2
)
4($
6
S
2
,
6
7
0O7
Figure 11. Crosstalk vs. frequency
#2/334!,+D"
2
,
0
O
2
G
7
7
7
TDA7851A
F(Z
Figure 12. Supply voltage rejection vs. frequency
'!0'03
F(Z
'!0'03
Figure 13. Output attenuation vs. supply voltage
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6
S
6
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Figure 14.
Power dissipation and efficiency vs. output power (R
L
= 4
, SINE)
0
TOT
7 H
H
6
S
2
,
6
X 7
F+(Z3).%
Figure 15. Power dissipation and efficiency vs. output power (R
L
= 2
, SINE)
0
TOT
7 H
6
S
2
,
6
X 7
F+(Z3).%
H
0
TOT
0
TOT
0
O
7
0
O
7
'!0'03
10/15
'!0'03
Doc ID 17715 Rev 3
TDA7851A Electrical specifications
Figure 16. Power dissipation vs. output power
(R
L
= 4
, audio program simulation)
Figure 17.
Power dissipation vs. output power
(R
L
= 2
, audio program simulation)
0
TOT
7
0
TOT
7
6
S
6
2
,
X 7
'!533)!../)3%
6
S
6
2
,
X 7
'!533)!../)3%
#,)034!24
#,)034!24
0
O
7
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Figure 18.
ITU R-ARM frequency response, weighting filter for transient pop
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0
O
7
'!0'03
(Z
'!0'03
Doc ID 17715 Rev 3 11/15
Application hints TDA7851A
The TDA7851A integrates a DC offset detector to avoid that an anomalous DC offset on the inputs of the amplifier may be multiplied by the gain and result in a dangerous large offset on the outputs which may lead to speakers damage for overheating.
The feature works with the amplifier unmuted and no signal at the inputs.
4.2 SVR
Besides its contribution to the ripple rejection, the SVR capacitor governs the turn ON/OFF time sequence and, consequently, plays an essential role in the pop optimization during
ON/OFF transients. To conveniently serve both needs, its minimum recommended value is 10 µ F .
The TDA7851A's inputs are ground-compatible and can stand very high input signals
(± 8 Vpk) without any performance degradation.
If the standard value for the input capacitors (0.1µF) is adopted, the low frequency cut-off amounts to 16 Hz.
The input capacitors should be 1/4 of the capacitor connected to AC-GND pin for optimum pop performance.
4.4 Standby muting
Standby and muting facilities are both CMOS-compatible. In absence of true CMOS ports or microprocessors, a direct connection to Vs of these two pins is admissible but a 470 k
equivalent resistance should present between the power supply and the muting and standby pins.
R-C cells have always to be used in order to smooth down the transitions for preventing any audible transient noises.
About the standby, the time constant to be assigned in order to obtain a virtually pop-free transition has to be slower than 2.5 V/ms.
Under normal usage (4
speakers) the heatsink's thermal requirements have to be deduced from
, which reports the simulated power dissipation when real music/speech programmes are played out. Noise with gaussian-distributed amplitude was employed for this simulation. Based on that, frequent clipping occurrence (worst-case) causes P diss
= 26 W. Assuming T amb
= 70° C and T
CHIP
= 150 °C as boundary conditions, the heatsink's thermal resistance should be approximately 2 °C/W. This would avoid any thermal shutdown occurrence even after long-term and full-volume operation.
12/15 Doc ID 17715 Rev 3
TDA7851A 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 19.
Flexiwatt27 mechanical data and package dimensions
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Doc ID 17715 Rev 3 13/15
Revision history
Table 5.
Date
09-Jul-2010
13-Jun-2012
Document revision history
18-Sep-2013
Revision
1
2
3
Changes
Initial release.
Updated
;
Updated
Section 3.2: Electrical characteristics on page 7
.
Updated Disclaimer.
TDA7851A
14/15 Doc ID 17715 Rev 3
TDA7851A
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Doc ID 17715 Rev 3 15/15
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