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PDF TDA7851A Data sheet ( Hoja de datos )
| Número de pieza | TDA7851A | |
| Descripción | 4 X 45W MOSFET Quad Bridge Power Amplifier | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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TDA7851A
4 x 45 W MOSFET quad bridge power amplifier
Features
■ Multipower BCD technology
■ High output power capability:
– 4 x 45 W/4 Ω Max.
– 4 x 28 W/4 Ω @ 14.4 V, 1 kHz, 10 %
– 4 x 72 W/2 Ω Max.
■ MOSFET output power stage
■ Excellent 2 Ω 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
Flexiwatt 27
■ 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.
Table 1.
Device summary
Order code
TDA7851A
Package
Flexiwatt 27
Packing
Tube
July 2010
Doc ID 17715 Rev 1
1/15
www.st.com
1
1 page  
TDA7851A
www.DataSheet4U.com
Block diagram and application circuit
1 Block diagram and application circuit
1.1
Block diagram
Figure 1. Block diagram
ST-BY
MUTE
IN1
Vcc1
IN2
IN3
IN4
AC-GND
SVR
Vcc2
CD
OUT1+
OUT1-
PW-GND
OUT2+
OUT2-
PW-GND
OUT3+
OUT3-
PW-GND
OUT4+
OUT4-
PW-GND
TAB
S-GND
OFFSET
DETECTOR
D05AU1613
1.2
Application circuit
Figure 2. Application circuit
ST-BY
MUTE
IN1
R1
10K
R2
47K
C1
0.1μF
IN2
C2 0.1μF
IN3
C3 0.1μF
IN4
C4 0.1μF
C8
0.1μF
5
C9
1μF
23
C10
1μF
12
OFFSET
DETECTOR OUT
C7
2200μF
Vcc1-2 Vcc3-4
7 21
2
10
9
8
R4
47K
V
6
3
4
13 18
19
20
16
S-GND
15
14
17
C5
0.47μF
11 26
C6
47μF
SVR
CD
CD OUT
22
25
24
27
TAB
R3
47K
D05AU1614
V
OUT1
OUT2
OUT3
OUT4
Doc ID 17715 Rev 1
5/15
5 Page 
TDA7851A
www.DataSheet4U.com
Electrical specifications
Figure 16. Power dissipation vs. output power Figure 17. Power dissipation vs. output power
(RL = 4 Ω, audio program simulation)
(RL = 2 Ω, audio program simulation)
30 Ptot (W)
Vs = 14.4 V
25
RL = 4 x 4 Ω
GAUSSIAN NOISE
20
15
10
5
012
CLIP START
3
Po (W)
4
60 Ptot (W)
55 Vs = 14.4 V
50 RL = 4 x 2 Ω
GAUSSIAN NOISE
45
40 CLIP START
35
30
25
20
15
10
5
5 60 2 4 6
AC00036
Po (W)
Figure 18. ITU R-ARM frequency response,
weighting filter for transient pop
8 10
AC00037
Output attenuation (dB)
10
0
-10
-20
-30
-40
-50
10
100
1000
Hz
10000
100000
AC00343
Doc ID 17715 Rev 1
11/15
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet TDA7851A.PDF ] | |
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