ST TDA7850 User Manual
TDA7850
4 x 50 W MOSFET quad bridge power amplifier
Features
■High output power capability:
–4 x 50 W/4 Ω max.
–4 x 30 W/4 Ω @ 14.4 V, 1 kHz, 10 %
–4 x 80 W/2 Ω max.
–4 x 55 W/2 Ω @ 14.4V, 1 kHz, 10 %
■MOSFET output power stage
■Excellent 2 Ω 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 (26 dB)
–No external compensation
–No bootstrap capacitors
■On board 0.35 A high side driver
Flexiwatt25
(Vertical)
Flexiwatt25
(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
Table 1. Device summary
Description
The TDA7850 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/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.
The TDA7850 integrates a DC offset detector.
Order code |
Package |
Packing |
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TDA7850 |
Flexiwatt25 (Vertical) |
Tube |
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TDA7850H |
Flexiwatt25 (Horizontal |
Tube |
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November 2008 |
Rev 5 |
1/18 |
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www.st.com |
Contents |
TDA7850 |
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Contents
1 |
Block diagram and application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . |
5 |
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1.1 |
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
5 |
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1.2 |
Standard test and application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
5 |
2 |
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
6 |
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3 |
Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
7 |
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3.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3.4 Electrical characteristic curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4 |
Application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
14 |
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4.1 |
SVR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
14 |
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4.2 |
Input stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
14 |
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4.3 |
Standby and muting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
14 |
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4.4 |
DC offset detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
14 |
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4.5 |
Heatsink definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
14 |
5 |
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
15 |
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6 |
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
17 |
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2/18
TDA7850 |
List of tables |
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List of tables
Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Table 2. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Table 3. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Table 4. Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Table 5. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3/18
List of figures |
TDA7850 |
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List of figures
Figure 1. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Figure 2. Standard test and application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Figure 3. Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Figure 4. Components and top copper layer of the Figure 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Figure 5. Bottom copper layer Figure 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Figure 6. Quiescent current vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 7. Output power vs. supply voltage (RL = 4Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Figure 8. Output power vs. supply voltage (RL = 2Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Figure 9. Distortion vs. output power (RL = 4Ω). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Figure 10. Distortion vs. output power (RL = 2Ω). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Figure 11. Distortion vs. frequency (RL = 4Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Figure 12. Distortion vs. frequency (RL = 2Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Figure 13. Crosstalk vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 14. Supply voltage rejection vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Figure 15. Output attenuation vs. supply voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Figure 16. Power dissipation and efficiency vs. output power (RL = 4Ω, SINE) . . . . . . . . . . . . . . . . . 12 Figure 17. Power dissipation and efficiency vs. output power (RL = 2Ω, SINE) . . . . . . . . . . . . . . . . . 12 Figure 18. Power dissipation vs. output power (RL = 4Ω, audio program simulation) . . . . . . . . . . . . . 13 Figure 19. Power dissipation vs. output power (RL = 2Ω, audio program simulation) . . . . . . . . . . . . . 13 Figure 20. ITU R-ARM frequency response, weighting filter for transient pop. . . . . . . . . . . . . . . . . . . 13 Figure 21. Flexiwatt25 (vertical) mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . 15 Figure 22. Flexiwatt25 (horizontal) mechanical data and package dimensions. . . . . . . . . . . . . . . . . . 16
4/18
TDA7850 |
Block diagram and application circuit |
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1 Block diagram and application circuit
1.1Block diagram
Figure 1. Block diagram
Vcc1 |
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Vcc2 |
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470μF |
100nF |
ST-BY |
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MUTE |
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HSD |
HSD/VOFF_DET |
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OUT1+ |
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IN1 |
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OUT1- |
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0.1μF |
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PW-GND |
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OUT2+ |
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IN2 |
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OUT2- |
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0.1μF |
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PW-GND |
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OUT3+ |
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IN3 |
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OUT3- |
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0.1μF |
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PW-GND |
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OUT4+ |
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IN4 |
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OUT4- |
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0.1μF |
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PW-GND |
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AC-GND |
SVR |
TAB |
S-GND |
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0.47μF |
47μF |
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D94AU158D |
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1.2Standard test and application circuit
Figure 2. |
Standard test and application circuit |
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C8 |
C7 |
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0.1μF |
2200μF |
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Vcc1-2 |
Vcc3-4 |
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R1 |
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6 |
20 |
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ST-BY |
4 |
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9 |
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10K |
C9 |
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8 |
OUT1 |
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1μF |
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R2 |
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7 |
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22 |
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MUTE |
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47K |
C10 |
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C1 |
1μF |
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5 |
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2 |
OUT2 |
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IN1 |
11 |
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3 |
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0.1μF |
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IN2 |
12 |
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17 |
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C2 0.1μF |
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18 |
OUT3 |
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IN3 |
15 |
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19 |
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C3 0.1μF |
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21 |
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IN4 |
14 |
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24 |
OUT4 |
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C4 0.1μF |
S-GND |
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23 |
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13 |
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16 |
10 |
25 |
1 |
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C5 |
SVR |
HSD/OD |
TAB |
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C6 |
R3*) |
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0.47μF |
47μF |
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*) R3 = 10kΩ to be placed when pin 25 is used as offset detector. |
D95AU335C |
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5/18
Pin description |
TDA7850 |
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2 Pin description
Figure 3. Pin connection (top view)
TAB |
1 |
P-GND2
OUT2-
ST-BY
OUT2+
VCC
OUT1-
P-GND1
OUT1+
SVR
IN1
IN2
S-GND
IN4
IN3
AC-GND
OUT3+
P-GND3
OUT3-
VCC
OUT4+
MUTE
OUT4-
P-GND4
HSD |
25 |
Vertical
D94AU159A
TAB |
1 |
P-GND2
OUT2-
ST-BY
OUT2+
VCC
OUT1-
P-GND1
OUT1+
SVR
IN1
IN2
S-GND
IN4
IN3
AC-GND
OUT3+
P-GND3
OUT3-
VCC
OUT4+
MUTE
OUT4-
P-GND4
HSD |
25 |
Horizontal
D06AU1655
6/18
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