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TDA7854
4 x 47W MOSFET quad bridge power amplifier
Features

Multipower BCD technology High output power capability: - 4 x 47W/4 max. - 4 x 80W/2 max. MOSFET output power stage Excellent 2 driving capability Hi-fi class distortion Low output noise St-by function Mute function Automute at min. supply voltage detection Low external component count: - Internally fixed gain (26dB) - No external compensation - No bootstrap capacitors

Flexiwatt 25
Fortuitous open GND Reversed battery ESD
Description
The TDA7854 is a breakthrough MOSFET technology class AB audio power amplifier in Flexiwatt 25 package designed for high power car radio. The fully complementary P-Channel/NChannel 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.
Protections:

Output short circuit to GND, to Vs, across the load Very inductive loads Overrating chip temperature with soft thermal limiter Load dump voltage
Table 1. Device summary
Order code TDA7854 Package Flexiwatt 25 Packing Tube
October 2007
Rev 1
1/12
www.st.com 1
Contents
TDA7854
Contents
1 Block diagram and application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 1.2 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 2.2 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3
Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1 3.2 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4
Application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1 4.2 4.3 4.4 SVR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Input stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Stand-by and muting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Heatsink definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5 6
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
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TDA7854
List of tables
List of tables
Table 2. Table 3. Table 4. Table 5. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
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List of figures
TDA7854
List of figures
Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Power dissipation vs. output power (RL = 4, audio program simulation) . . . . . . . . . . . . . . 9 Flexiwatt25 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4/12
TDA7854
Block diagram and application circuit
1
1.1
Block diagram and application circuit
Block diagram
Figure 1. Block diagram
Vcc1 Vcc2
ST-BY CD OUT1+ IN1 OUT1PW-GND OUT2+ IN2 OUT2PW-GND OUT3+ IN3 OUT3PW-GND OUT4+ IN4 OUT4PW-GND AC-GND SVR TAB S-GND
MUTE
D06AU1646
1.2
Application circuit
Figure 2. Application circuit
C8 0.1F C7 2200F Vcc1-2 R1 ST-BY 10K R2 MUTE 47K C1 IN1 0.1F IN2 C2 0.1F IN3 C3 0.1F IN4 C4 0.1F S-GND 14 13 16 C5 0.47F C6 47F 10 SVR 25 CD 1 TAB
D06AU1647A
Vcc3-4 6 20 9 8 OUT1
4 C9 1F 22 C10 1F 11
7
5 2 3 OUT2
12
17 18 OUT3
15
19
21 24 23 OUT4
R3 V 47K CD OUT
5/12
Pin description
TDA7854
2
2.1
Pin description
Pin connection
Figure 3. Pin connection (top view)
1
25
ST-BY
P-GND2
OUT2+
OUT2-
OUT1-
P-GND1
OUT1+
SVR
IN1
IN2
S-GND
IN4
IN3
OUT3+
P-GND3
AC-GND
OUT3-
OUT4+
MUTE
OUT4-
D94AU159mod
2.2
Thermal data
Table 2.
Symbol Rth j-case
Thermal data
Parameter Thermal resistance junction to case max Value 1 Unit C/W
6/12
P-GND4
TAB
VCC
VCC
CD
TDA7854
Electrical specifications
3
3.1
Electrical specifications
Absolute maximum ratings
Table 3.
Symbol VS VS (DC) VS (pk) IO Ptot Tj Tstg
Absolute maximum ratings
Parameter Operating supply voltage DC supply voltage Peak supply voltage (for t = 50ms) Output peak current Non repetitive (t = 100s) Repetitive (duty cycle 10% at f = 10Hz) Power dissipation Tcase = 70C Junction temperature Storage temperature Value 18 28 50 10 9 85 150 -55 to 150 Unit V V V A A W C C
3.2
Table 4.
Electrical characteristics
Electrical characteristics (Refer to the test and application diagram, VS = 14.4V; RL = 4; Rg = 600; f = 1KHz; Tamb = 25C; unless otherwise specified).
Parameter Quiescent current Output offset voltage Voltage gain Channel gain unbalance VS = 14.4V; THD = 10% VS = 14.4V; THD = 1% VS = 14.4V; THD = 10%, 2 VS = 14.4V; THD = 1%, 2 Max. output power(1) Distortion Output Noise Supply voltage rejection High cut-off frequency Input Impedance VS = 15.2V; RL = 4 VS = 15.2V; RL = 2 Po = 4W "A" Weighted Bw = 20Hz to 20KHz f = 100Hz; Vr = 1Vrms PO = 0.5W 50 100 80 28 22 48 38 47 80 0.01 35 50 70 300 100 120 100 RL = Play mode / Mute mode Test condition Min. 100 -60 25 26 Typ. 150 Max. 250 +60 27 1 Unit mA mV dB dB W W W W W W % V V dB KHz K
Symbol Iq1 VOS Gv dGv
Po
Output power
Po max. THD eNo SVR fch Ri
7/12
Electrical specifications Table 4.
TDA7854
Electrical characteristics (continued) (Refer to the test and application diagram, VS = 14.4V; RL = 4; Rg = 600; f = 1KHz; Tamb = 25C; unless otherwise specified).
Parameter Cross Talk St-by current consumption St-by pin current St-by out threshold voltage St-by in threshold voltage Mute attenuation Mute out threshold voltage Mute in threshold voltage Test condition f = 1KHz PO = 4W f = 10KHz PO = 4W VSt-By = 0 VSt-By = 1.2V to 2.65V (Amp: ON) (Amp: OFF) POref = 4W (Amp: Play) (Amp: Mute) (Amp: Mute) Att 80dB; POref = 4W 6.8 7 80 2.6 1.2 90 2.65 1.2 Min. 60 Typ. 70 60 Max. 10 1 Unit dB dB A A V V dB V V V
Symbol CT ISB Ipin5 VSB out VSB in AM VM out VM in
VAM in
VS automute threshold (Amp: Play) Att < 0.1dB; PO = 0.5W 7.5 7 -5 12 8 18 18 V A A
Ipin23
Muting pin current
VMUTE = 1.2V (Sourced current) VMUTE = 2.6V
CLIPPING DETECTOR CDLK CDSAT CDTHD Clip Det high leakage current Clip Det sat voltage Clip Det THD level Cd Off DC On; ICD = 1mA 0 0.2 2 1 0.4 A V %
1. Saturated square wave output
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TDA7854
Application hints
4
4.1
Application hints
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 10F.
4.2
Input stage
The TDA7854's inputs are ground-compatible and can stand very high input signals ( 8Vpk) without any performances degradation. If the standard value for the input capacitors (0.1F) is adopted, the low frequency cut-off will amount to 16 Hz.
4.3
Stand-by and muting
R-C cells have always to be used in order to smooth down the transitions for preventing any audible transient noise. About stand-by, the time constant to be assigned in order to obtain a virtually pop-free transition has to be slower than 2.5V/ms. A direct connection to Vs of these two pins is admissible but a 470kOhm equivalent resistance should be present between the power supply and muting and stand-by pins.
4.4
Heatsink definition
Under normal usage (4 Ohm speakers) the heatsink's thermal requirements have to be deduced from Figure 4, 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) will cause Pdiss = 26W. Assuming Tamb = 70C and TCHIP = 150C as boundary conditions, the heatsink's thermal resistance should be approximately 2C/W. This would avoid any thermal shutdown occurrence even after long-term and full-volume operation. Figure 4. Power dissipation vs. output power (RL = 4, audio program simulation)
30 Ptot (W) Vs = 14.4 V RL = 4 x 4 GAUSSIAN NOISE CLIP START 20
25
15
10
5 0 1 2 3 Po (W) 4 5 6
AC00036
9/12
Package information
TDA7854
5
Package information
In order to meet environmental requirements, ST offers this device in ECOPACK(R) packages. This package has a Lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com. Figure 5. Flexiwatt25 mechanical data and package dimensions
DIM. A B C D E F (1) G G1 H (2) H1 H2 H3 L (2) L1 L2 (2) L3 L4 L5 M M1 N O R R1 R2 R3 R4 V V1 V2 V3 MIN. 4.45 1.80 0.75 0.37 0.80 23.75 28.90 mm TYP. 4.50 1.90 1.40 0.90 0.39 1.00 24.00 29.23 17.00 12.80 0.80 22.47 18.97 15.70 7.85 5 3.5 4.00 4.00 2.20 2 1.70 0.5 0.3 1.25 0.50 MAX. 4.65 2.00 1.05 0.42 0.57 1.20 24.25 29.30 MIN. 0.175 0.070 0.029 0.014 0.031 0.935 1.139 inch TYP. 0.177 0.074 0.055 0.035 0.015 0.040 0.945 1.150 0.669 0.503 0.031 0.884 0.747 0.618 0.309 0.197 0.138 0.157 0.157 0.086 0.079 0.067 0.02 0.12 0.049 0.019 MAX. 0.183 0.079 0.041 0.016 0.022 0.047 0.955 1.153
OUTLINE AND MECHANICAL DATA
22.07 18.57 15.50 7.70
22.87 19.37 15.90 7.95
0.869 0.731 0.610 0.303
0.904 0.762 0.626 0.313
3.70 3.60
4.30 4.40
0.145 0.142
0.169 0.173
5 (T p.) 3 (Typ.) 20 (Typ.) 45 (Typ.)
Flexiwatt25 (vertical)
(1): dam-bar protusion not included (2): molding protusion included
V C B V V3 H3 H H1 H2 R3 R4 V1 R2 R L L1 A
L4
O
L2
N
L3
V1
V2
R2 L5 G G1 F
FLEX25ME
R1 R1 R1 E M M1
D
Pin 1
7034862
10/12
TDA7854
Revision history
6
Revision history
Table 5.
Date 4-Oct-2007
Document revision history
Revision 1 Initial release. Changes
11/12
TDA7854
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