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TDA7850A
4 x 50 W MOSFET quad bridge power amplifier plus HSD
Features
High output power capability: - 4 x 50W/4 max. - 4 x 30W/4 @ 14.4V, 1KHz, 10% - 4 x 80W/2 max. - 4 x 55W/2 @ 14.4V, 1KHz, 10% 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 On board 0.35A high side driver

Flexiwatt27 (vertical)
Flexiwatt27 (horizontal)
ESD
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 Fortuitous open gnd Reversed battery
Description
The TDA7850A is a breakthrough MOSFET technology class AB audio power amplifier in Flexiwatt27 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. The TDA7850A integrates a DC offset detector.
Table 1.
Device summary
Order code TDA7850A TDA7850AH Package Flexiwatt27 (vertical) Flexiwatt27 (horizontal Packing Tube Tube
October 2007
Rev 1
1/16
www.st.com 1
Contents
TDA7850A
Contents
1 Block diagram and application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 1.2 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Standard test and application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 3
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1 3.2 3.3 3.4 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Electrical characteristic curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4
Application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1 4.2 4.3 4.4 4.5 SVR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Input stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Stand-by and muting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 DC offset detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Heatsink definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5 6
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2/16
TDA7850A
List of tables
List of tables
Table 1. Table 2. Table 3. Table 4. Table 5. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3/16
List of figures
TDA7850A
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. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Standard test and application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Quiescent current vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Output power vs. supply voltage (RL = 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Output power vs. supply voltage (RL = 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Distortion vs. output power (RL = 4). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Distortion vs. output power (RL = 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Distortion vs. frequency (RL = 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Distortion vs. frequency (RL = 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Crosstalk vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Supply voltage rejection vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Output attenuation vs. supply voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Power dissipation & efficiency vs. output power (RL = 4, SINE) . . . . . . . . . . . . . . . . . . . 11 Power dissipation & efficiency vs. output power (RL = 2, SINE) . . . . . . . . . . . . . . . . . . . 11 Power dissipation vs. output power (RL = 4, audio program simulation) . . . . . . . . . . . . . 11 Power dissipation vs. output power (RL = 2, audio program simulation) . . . . . . . . . . . . . 11 ITU R-ARM frequency response, weighting filter for transient pop. . . . . . . . . . . . . . . . . . . 11 Flexiwatt27 (vertical) mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . 13 Flexiwatt27 (horizontal) mechanical data and package dimensions. . . . . . . . . . . . . . . . . . 14
4/16
TDA7850A
Block diagram and application circuit
1
1.1
Block diagram and application circuit
Block diagram
Figure 1. Block diagram
Vcc1 Vcc2 470F ST-BY OFF DET MUTE HSD HSD/OFF DET OUT1+ IN1 0.1F OUT1PW-GND OUT2+ IN2 0.1F OUT2PW-GND OUT3+ IN3 0.1F OUT3PW-GND OUT4+ IN4 0.1F AC-GND 0.47F SVR 47F
D03AU1467
100nF
OUT4PW-GND TAB S-GND
1.2
Standard test and application circuit
Figure 2. Standard test and 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 15 14 17 C5 0.47F SVR C6 47F 11 26 1, 27 16 13 12 C10 1F C9 1F 23 5 7 Vcc3-4 21 10 9 8 OUT1
6 3 4 OUT2
18 19 20 OUT3
22 25 24 2 OFF DET OUT4
HSD/OFF DET
TAB
D03AU1469
5/16
Pin description
TDA7850A
2
Pin description
Figure 3. Pin connection (top view)
TAB OFF DET PW-GND OUT2ST-BY OUT2+ VCC OUT1PW-GND OUT1+ SVR IN1 IN2 S-GND IN4 IN3 AC-GND OUT3+ PW-GND OUT3VCC OUT4+ MUTE OUT4PW-GND HSD TAB 27
D03AU1468
1
Vertical
TAB OFF DET PW-GND OUT2ST-BY OUT2+ VCC OUT1PW-GND OUT1+ SVR IN1 IN2 S-GND IN4 IN3 AC-GND OUT3+ PW-GND OUT3VCC OUT4+ MUTE OUT4PW-GND HSD TAB
1
Horizontal
27
AC00107
6/16
TDA7850A
Electrical specifications
3
3.1
Electrical specifications
Absolute maximum ratings
Table 2.
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 repetitive (duty cycle 10% at f = 10Hz) non repetitive (t = 100s) Power dissipation Tcase = 70C Junction temperature Storage temperature Value 18 28 50 9 10 80 150 -55 to 150 Unit V V V A A W C C
3.2
Thermal data
Table 3.
Symbol Rth j-case
Thermal data
Parameter Thermal resistance junction to case Max. Value 1 Unit C/W
3.3
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 During mute ON/OFF output offset voltage RL = Play mode - Mute mode ITU R-ARM weighted see Figure 18 -10 -10 25 26 Test Condition Min. 100 Typ. 180 Max. 280 60 +10 +10 27 1 Unit mA mV mV mV dB dB
Symbol Iq1 VOS
dVOS
During St-By ON/OFF output offset voltage Voltage gain Channel gain unbalance
Gv dGv
7/16
Electrical specifications Table 4.
TDA7850A
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 Test Condition VS = 13.2V; THD = 10% VS = 13.2V; THD = 1% VS = 14.4V; THD = 10% VS = 14.4V; THD = 1% VS = 14.4V; THD = 10%, 2 Min. 23 16 28 20 50 Typ. 25 19 30 23 55 50 85 0.006 0.015 35 50 50 100 80 f = 1KHz PO = 4W f = 10KHz PO = 4W VSt-By = 1.5V VSt-By = 0V St-by pin current St-By out threshold voltage St-By in threshold voltage Mute attenuation Mute out threshold voltage Mute in threshold voltage VSt-By = 1.5V to 3.5V (Amp: ON) (Amp: OFF) POref = 4W (Amp: Play) (Amp: Mute) (Amp: Mute) Att 80dB; POref = 4W (Amp: Play) Att < 0.1dB; PO = 0.5W VMUTE = 1.5V (Sourced Current) VMUTE = 3.5V 6.5 7 7.5 7 -5 12 8 18 18 A A 80 3.5 1.5 90 2.75 1.5 60 75 300 100 70 60 120 20 10 1 A V V dB V V 0.05 0.07 50 70 Max. Unit
Symbol
W
Po
Output power
W W % V dB KHz K dB A
Po max. THD eNo SVR fch Ri CT ISB Ipin5 VSB out VSB in AM VM out VM in
Max. output power(1) Distortion Output noise Supply voltage rejection High cut-off frequency Input impedance Cross talk
VS = 14.4V; RL = 4 VS = 14.4V; RL = 2 Po = 4W Po = 15W; RL = 2 "A" Weighted Bw = 20Hz to 20KHz f = 100Hz; Vr = 1Vrms PO = 0.5W
St-By current consumption
VAM in
VS automute threshold
V
Ipin23
Muting pin current
HSD section Vdropout Iprot Dropout voltage Current limits IO = 0.35A; VS = 9 to 16V 400 0.25 0.6 800 V mA
8/16
TDA7850A Table 4.
Electrical specifications 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 Test Condition Min. Typ. Max. Unit
Symbol
Offset detector (Pin 26) VM_ON VM_OFF VOFF V26_T V26_F Mute voltage for DC offset detection enabled 8 Vstby = 5V 2 0 12 3 6 4 1.5 V V V V V
Detected differential output offset Vstby = 5V; Vmute = 8V Pin 26 voltage for detection = TRUE Pin 26 Voltage for detection = FALSE Vstby = 5V; Vmute = 8V VOFF > 4V Vstby = 5V; Vmute = 8V VOFF > 2V
1. Saturated square wave output.
3.4
Figure 4.
Electrical characteristic curves
Quiescent current vs. supply voltage Figure 5. Output power vs. supply voltage (RL = 4)
200 190 180 170 160 150 140 130 120 110 100
Id (mA) Vi = 0 RL =
Po (W) 80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5 THD= 1% RL= 4 f = 1 KHz Po-max
THD= 10%
8
10
12 Vs (V)
14
16
18
AC00064
8
9
10
11
12
13 Vs (V)
14
15
16
17
18
AC00064
Figure 6.
Output power vs. supply voltage (RL = 2)
Figure 7.
Distortion vs. output power (RL = 4)
Po (W) 130 120 110 100 90 80 70 60 50 40 30 20 10 0 8 9 10 11 12 13 Vs (V) 14 15 16 17 18
AC00066
THD (%) 10
Po-max
RL= 2 f = 1 KHz THD=10%
VS = 14.4 V RL = 4 1 f = 10 KHz 0.1
THD=1%
0.01
f = 1 KHz
0.001 0.1
1 Po (W)
10
100
AC00067
9/16
Electrical specifications
TDA7850A
Figure 8.
Distortion vs. output power (RL = 2)
Figure 9.
Distortion vs. frequency (RL = 4)
THD (%) 10 VS = 14.4 V RL = 2 1 f = 10 KHz 0.1
THD (%) 10 VS = 14.4 V RL = 4 Po = 4 W
1
0.1
f = 1 KHz 0.01
0.01
0.001 0.1
0.001
1 Po (W) 10 100
AC00068
10
100
1000 f (Hz)
10000
100000
AC00069
Figure 10. Distortion vs. frequency (RL = 2)
THD (%) 10 VS = 14.4 V RL = 2 Po = 8 W
Figure 11. Crosstalk vs. frequency
CROSSTALK (dB)
-20 -30 -40 -50 RL = 4 Po = 4 W Rg = 600
1
0.1
-60 -70
0.01
-80 -90
0.001 10 100 1000 f (Hz) 10000 100000
AC00070
-100 10 100 1000
f (Hz)
10000
100000
AC00071
Figure 12. Supply voltage rejection vs. frequency
-20 -30 -40 -50 SVR (dB)
Figure 13. Output attenuation vs. supply voltage
OUTPUT ATTN (dB) 0 RL = 4 Po = 4 W ref -20
Rg = 600 Vripple = 1 Vrms
-40
-60 -70 -80
-60
-80
-90 -100 10 100 1000 f (Hz) 10000 100000
AC00072
-100 5 6 7 Vs (V) 8 9 10
AC00073
10/16
TDA7850A
Electrical specifications
Figure 14. Power dissipation & efficiency vs. output power (RL = 4, SINE)
90 80 70 60 50 40 Ptot 30 20 10 0 0 2 4 6 8 10 12 14 Po (W) 16 18 20 22 24 26 28 30 30 20 10 0 Ptot (W) VS = 14.4 V RL = 4 x 4 f = 1 KHz SINE (%) 90 80 70 60 50 40
Figure 15. Power dissipation & efficiency vs. output power (RL = 2, SINE)
Ptot (W) 180 160 140 120 100 80 60 40 20 0 0 5 10 15 20 25 Po (W) 30 35 40 45 50 55
AC00075
(%)
90 80 70 60 50
VS = 14.4 V RL = 4 x 2 f = 1 KHz SINE
Ptot
40 30 20 10 0
AC00074
Figure 16. Power dissipation vs. output power Figure 17. Power dissipation vs. output power (RL = 4, audio program simulation) (RL = 2, audio program simulation)
30 Ptot (W) VS = 13.2 V RL = 4 x 4 GAUSSIAN NOISE CLIP START 20 60 55 50 45 40 35 30 15 25 20 10 15 10 5 0 1 2 3 Po (W) 4 5 6
AC00076
Ptot (W) VS = 13.2 V RL = 4 x 2 GAUSSIAN NOISE CLIP START
25
5 0 2 4 Po (W) 6 8 10
AC00077
Figure 18. ITU R-ARM frequency response, weighting filter for transient pop
Output attenuation (dB) 10 0 -10 -20 -30 -40 -50 10 100 1000 Hz 10000 100000
AC00343
11/16
Application hints
TDA7850A
4
Application hints
Ref. to the circuit of Figure 2.
4.1
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 TDA7850A's inputs are ground-compatible and can stand very high input signals ( 8Vpk) without any performance 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
STAND-BY 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 470k equivalent resistance should be present between the power supply and the muting and stand-by pins. R-C cells have always to be used in order to smooth down the transitions for preventing any audible transient noises. About the 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.
4.4
DC offset detector
The TDA7850A 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. The DC offset detection can be available at 2 different pins: - - Pin 2 (always enabled) Pin 26. Only enabled if Vmute (pin23) is set higher than 8V. If not (Vmute < 6 V) pin 26 will revert to the original HSD function.
4.5
Heatsink definition
Under normal usage (4 Ohm speakers) the heatsink's thermal requirements have to be deduced from Figure 16, 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.
12/16
TDA7850A
Package information
5
Package information
In order to meet environmental requirements, ST offers these devices in ECOPACK(R) packages. These packages have 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 19. Flexiwatt27 (vertical) 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 25.75 28.90 mm TYP. 4.50 1.90 1.40 0.90 0.39 1.00 26.00 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 26.25 29.30 MIN. 0.175 0.070 0.029 0.014 0.031 1.014 1.139 inch TYP. 0.177 0.074 0.055 0.035 0.015 0.040 1.023 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 1.033 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 (Typ.) 3 (Typ.) 20 (Typ.) 45 (Typ.)
Flexiwatt27 (vertical)
(1): dam-bar protusion not included (2): molding protusion included
V C B V H H1 H3 O H2 R3 R4 V1
N
V3
A
L4
R2 R L L1
L2
L3
V1
V2
R2 L5 G G1 F
R1 R1 R1 E
FLEX27ME
D
Pin 1
M
M1
7139011
13/16
Package information
TDA7850A
Figure 20. Flexiwatt27 (horizontal) 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 L6 M M1 M2 N P R R1 R2 R3 R4 V V1 V2 V3 MIN. 4.45 1.80 mm TYP. 4.50 1.90 1.40 2.00 0.39 1.00 26.00 29.23 17.00 12.80 0.80 22.04 10.5 15.70 7.85 5 5.45 1.95 3.00 4.73 5.61 2.20 3.50 1.70 0.50 0.30 1.25 0.50 MAX. 4.65 2.00 MIN. 0.175 0.070 inch TYP. 0.177 0.074 0.055 0.079 0.015 0.040 1.023 1.150 0.669 0.503 0.031 0.868 0.413 0.618 0.309 0.197 0.214 0.077 0.118 0.186 0.220 0.086 0.138 0.067 0.02 0.12 0.049 0.02 MAX. 0.183 0.079
OUTLINE AND MECHANICAL DATA
0.37 0.80 25.75 28.90
0.42 0.57 1.20 26.25 29.30
0.014 0.031 1.014 1.139
0.016 0.022 0.047 1.033 1.153
21.64 10.15 15.50 7.70 5.15 1.80 2.75
22.44 10.85 15.90 7.95 5.85 2.10 3.50
0.852 0.40 0.610 0.303 0.203 0.070 0.108
0.883 0.427 0.626 0.313 0.23 0.083 0.138
3.20
3.80
0.126
0.15
5 (Typ.) 3 (Typ.) 20 (Typ.) 45 (Typ.)
Flexiwatt27 (Horizontal)
(1): dam-bar protusion not included; (2): molding protusion included
7399738 A
14/16
TDA7850A
Revision history
6
Revision history
Table 5.
Date 9-Oct-2007
Document revision history
Revision 1 Initial release. Changes
15/16
TDA7850A
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