TDA7451
4x7W OR 2x22W CAR RADIO POWER AMPLIFIER PLUS
TRIPLE POWER SUPPLY
PRELIMINARY DATA
HIGHOUTPUTPOWERCAPABILITY:
4 x9.5WOR2 x 32W/4Ω MAX
4 x 8.5W OR 2 x 28W/4ΩEIAJ
4 x 7W OR 2 x 22W/4Ω@14.4V,1KHz; 10%
MINIMIZEDEXTERNAL COUNT
- NO NEED OF DECOUPLING CAPACITORS
- NO NEED OF BOOTSTRAPCAPACITOR
- NO NEED OF EXTERNAL COMPENSATION
- INTERNALLYFIXED GAIN (20dB)
POP-FREEAUDIO SECTION
ST-BYFUNCTION (C-MOS)
MUTEFUNCTION (C-MOS)
CLIP DETECTOR, THERMAL WARNING,
SHORTCIRCUIT DETECTION
BUILT-INVOLTAGE REGULATORS:
- 5V @ 150mAWITH RESET
- 5V @ 500mAWITH ST-BY
- 8.5V@ 200mAWITH ST-BY
REGULATORSDIAGNOSTIC FEATURE: UN-
DERVOLTAGE, 8.5V DROP SENSE, SHORT
CIRCUIT, LOAD DUMP, OVER-TEMPERA-
ORDERING NUMBER: TDA7451
TURE
PROTECTIONS
General:
LOADDUMP
OVERRATINGCHIP TEMPERATURE
AudioSection:
OUT SHORT (TO GND, TO Vs AND
ACROSSTHE LOAD)
Power SupplySection:
SHORT CIRCUIT PROTECTION (OUT TO
GND)
Flexiwatt25
BLOCK DIAGRAM
MUTE
ST-BY
8.5V
5V
5V
RESET
DIAG
10KΩ
10µF
10KΩ
1µF
10µF
10µF
10µF
22K 22K
47µF
22
8
V
2
V
V
SVR
O3
O2
O1
200mA
REG.
3
500mA
REG.
4
150mA
REG.
9
7
DIAG
10 5 15 14
STCAP
470µF
IN RF
IN RR
0.1µF 0.1µF
V
12
11
0.1µF 0.1µF
IN LRIN LF
CC1
CC2
620
+
-
+
-
16 13
DDL S-GND
18,24
23
21
25
17
1
19
0.1µF
+
-+
HVCChvcc
+
TAB
-+
PW-GND
D95AU311C
RF
RR
LF
LR
V
CC
1000µFV
-
-
October 1999
This is preliminary information on a new product now in developmentor undergoing evaluation.Details are subject to change without notice.
1/9
TDA7451
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
S
V
S
V
S
I
o
I
o
P
tot
T
stg,Tj
V
out
V
in
RESR Output capacitor series resistance 0.2 to 10
PIN CONNECTION
Operating Supply Voltage 18 V
DC Supply Voltage 28 V
Peak Supply Voltage (t = 50ms) 40 V
Audio OutputPeak Current (non repetitive t = 100µs) 4 A
Audio OutputPeak Current (repetitive f > 10Hz) 3 A
Voltage Regulators Output Current internally limited
Power Dissipation at T
=85°C55W
case
Storage and Junction Temperature Range -40 to 150
Output Voltages (DIAG, RESET) 7 V
Input Voltages(ST-BY, MUTE) 18 V
C
°
Ω
1 25
TAB
REG3
REG2
REG1
VCC1
ST-CAP
DIAG
ST-BY
SVR
RESET
IN-RF
IN-RR
SGND
IN-LR
IN-LF
DDL
OUT-LF
PWGND
VCC2
OUT-LR
MUTE
OUT-RR
D95AU315
OUT-RF
PWGND
HVCC
THERMAL DATA
Symbol Parameter Unit
Thermal ResistanceJunction-case 1.2 °C/W
2/9
R
th j-case
PO= 4 X 7W S.E. APPLICATION
MUTE
ST-BY
8.5V
RESET
DIAG
10KΩ
10µF
10KΩ
1µF
10µF
5V
10µF
5V
10µF
22K 22K
V
V
V
SVR
47µF
22
8
2
O3
3
O2
4
O1
9
7
10 5 15 14
STCAP
470µF
IN RF
IN RR
0.1µF 0.1µF
V
12
11
0.1µF 0.1µF
IN LRIN LF
CC1
CC2
620
16 13
DDL S-GND
18,24
23
21
25
17
1
19
0.1µF
+
-+
HVCC
+
TAB
-+
PW-GND
D96AU514
RF
RR
LF
LR
TDA7451
V
CC
1000µFV
-
-
PO= 2 X 22W BTL APPLICATION
MUTE
ST-BY
8.5V
5V
5V
RESET
DIAG
10KΩ
10µF
10KΩ
1µF
10µF
10µF
10µF
22K 22K
47µF
V
V
V
SVR
O3
O2
O1
8
2
3
4
9
7
10
IN R
0.22µF
1222
11 6 20
5 1514 1613
STCAP
470µF
0.22µF
DDL S-GND
IN L
V
CC
V
V
CC1
CC2
0.1µF
23
1000µF
+
OUT R
21
-
25
18,24
17
TAB
1
19
PW-GND
D96AU515
+
OUT L
-
3/9
TDA7451
ELECTRICALCHARACTERISTICS
(Refer to the test circuit; V
= 14.4V;RL=4Ω,T
S
amb
=25°C,
f = 1kHz, unless otherwise specified)
Symbol Parameter Test Condition Min. Typ. Max. Unit
GENERAL
V
V
SB OUT
I
ST-BY
I
q
SB IN
Total Quiescent Current I
L01,IL02,IL03
= 5mA 80 150 mA
ST-BY IN Threshold Voltage 1.5 V
ST-BY OUT ThresholdVoltage 3.5 V
Stand-by Current Consumption I
= 2mA 0.5 mA
L01
AUDIOSECTION
P
O
P
o EIAJ
P
o max.
d Distortion R
CT Cross Talk f= 1kHz; R
R
IN
G
V
G
V
BW Bandwidth -3dB 100 KHz
E
NO
SVR Supply Voltage Rejection R
ASB Stand-by Attenuation 90 100 dB
I
PIN 8
A
M
V
MIN
V
M OUT
I
CD
Output Power RL=4Ω; THD = 10%
Bridge
Single Ended
19
6
7
22
EIAJ Output Power (**) VS = 13.7V
Bridge
Single Ended
26
7.5
28
8.5
Max. Output Power (**) VS = 14.4V
Bridge
Single Ended
=4Ω;
L
Single Ended, P
Bridge, P
O
f = 10kHz; R
Input Impedance Single Ended
Bridge
Voltage Gain Single Ended
Bridge
= 0.1 to 3W
O
= 0.1 to 8W
=0
g
=0
g
30
8
32
9.5
0.04
0.06
50 60
55
70
35
19
25
100
50
20
26
0.3
0.3
130
65
21
27
Voltage Gain Match. 1 dB
Output Noise Voltage (*) Rg= 0; SingleEnded 100 µV
= 0; f = 100Hz; Single Ended 48 55 dB
g
ST-BY Pin Current Playmode; Vpin8 = 5V -10 30
MUTE Attenuation 80 90 dB
MUTE IN Threshold Voltage 1.5 V
MUTE OUT Threshold Voltage 3.5 V
Clipping Detector Current
(Pull up to 5V with 10KΩ)
CDoff: P
= 3.5W 5 µA
omin
CDon: THD = 5% 50 190 280
POWER SUPPLYSECTION
V
O1
∆V
O1
I
LO1
∆V
O1
SVR Ripple Rejection V
∆V
O1
Output Voltages I01= 5mA 4.85 5 5.15 V
Load Regulation 1 I01= 5 to 150mA 80 mV
Current Limit V01= 0V 250 350 600 mA
Dropout Voltages I01= 150mA 700 mV
= 1Vpp; I01= 50mA
ripple
f = 100Hz
f = 10KHz
60
50
Line Regulation 1 VS= 8 to 18V; IO1= 5mA 10 40 mV
RESET
Reset On Low V
Reset Off Low V
Reset Hyst Reset Threshold Hysteresis vs
Reg 1
onReset Reset Output Voltage Reset activated
V
out
(*) 22Hz to 22KHz
Reset On Threshold 3.5 4.0 4.7 V
REG1
Reset Off Threshold 4.25 V
REG1
250 500 mV
R(Reset to V
Reg1
)≥15K
1.5 V
W
W
W
W
W
W
%
%
dB
dB
KΩ
KΩ
dB
dB
µ
µ
dB
dB
A
A
4/9
TDA7451
ELECTRICALCHARACTERISTICS
(continued)
Symbol Parameter Test Condition Min. Typ. Max. Unit
DIAGNOSTICOUTPUT
Diag On Vs Low Vs Diag. ON Threshold 7 7.5 8 V
Diag Off Vs Low Vs Diag. OFF Thrershold 7.6 V
DiagHystVs Low Vs Diag. Hysteresis 100 150 mV
Diag Dump Diag. Threshold vs Overvoltage 20 21 22 V
Diag On
Drop
On Diag Diag. Output Voltage Diag activated
V
out
V
O2
∆V
O2
I
L02
∆V
O2
SVR Ripple Rejection V
∆V
O2
V
O3
∆V
O3
I
L03
V
∆
O3
SVR Ripple Rejection V
∆V
O3
V
Output Voltage Drop
REG3
IO3= 100mA 90 200 mV
Before Diag. Activation
1.5 V
R (Diag to V
REG1
) ≥ 15K
Output Voltage 2 IO2= 5mA 4.85 5 5.15 V
Load Regulation 2 IO2= 5 to500mA 100 mV
Current Limit 2 VO2= 0V 0.8 1 1.5 A
Dropout Voltage IO2= 500mA 1 1.5 V
= 1Vpp; I02= 100mA
ripple
f = 100Hz
f = 10KHz
60
50
Line Regulation VS= 8 to 18V, IO2= 5mA 10 40 mV
Output Voltage 3 IO3= 5mA 8.25 8.5 8.75 V
Load Regulation 3 IO3= 5 to 200mA 80 mV
Current Limit 3 300 400 800 mA
Dropout Voltage IO3= 200mA 1 V
= 1Vpp; I03= 100mA
ripple
f = 100Hz
f = 10KHz
60
50
Line Regulation 3 VS= 11 to 18V, IO3= 5mA 10 40 mV
dB
dB
dB
dB
DIAGNOSTICDIAGRAM
VCC
7.5V
21V
2.8V
2.2V
+
-
+
-
+
-
+
-
HYST=0.1V
ST-BY
DUMP
Tj>170
REFERENCE
DIAG
EN
AMPLIFIERS
EN
EN
CLIPPING
STCAP
STCAP
REG1
5V 150mA
REG3
8.5V 200mA
REG2
5V 500mA
Tj>150
OUTSHORT
OUTSHORT
OUTSHORT
AMPLIFIERS
OVERLOAD
HYST=0.5V
DROP SENSE
D96AU504B
REG1
RESET
+
-4V
REG3
OUT
REG2
CD
5/9
TDA7451
VOLTAGESUPPLYSECTION WAVEFORMS
VCC
7.6
VREG1
4.25
4
RESET
OFF
8.5
5
ON
ST-BY
2.2
VREG2
5V
VREG3
8.5
DIAG
OFF
6/9
ON
D96AU505B
AUDIO SECTION WAVEFORMS
PIN
ST-BY
VOLTAGE
PIN
MUTE
VOLTAGE
Vs
OUTPUT
WAVEFORM
TDA7451
t
t
t
Vpin
16
WAVEFORM
D96AU516
CLIPPING
SHORT TO
OR TO Vs
GND
t
THERMAL
PROXIMITY
7/9
TDA7451
DIM.
MIN. TYP. MAX. MIN. TYP. MAX.
mm inch
A 4.45 4.50 4.65 0.175 0.177 0.183
B 1.80 1.90 2.00 0.070 0.074 0.079
C 1.40 0.055
D 0.75 0.90 1.05 0.029 0.035 0.041
E 0.37 0.39 0.42 0.014 0.015 0.016
F (1) 0.57 0.022
G 0.80 1.00 1.20 0.031 0.040 0.047
G1 23.75 24.00 24.25 0.935 0.945 0.955
H (2) 28.90 29.23 29.30 1.138 1.150 1.153
H1 17.00 0.669
H2 12.80 0.503
H3 0.80 0.031
L (2) 22.07 22.47 22.87 0.869 0.884 0.904
L1 18.57 18.97 19.37 0.731 0.747 0.762
L2 (2) 15.50 15.70 15.90 0.610 0.618 0.626
L3 7.70 7.85 7.95 0.303 0.309 0.313
L4 5 0.197
L5 3.5 0.138
M 3.70 4.00 4.30 0.145 0.157 0.169
M1 3.60 4.00 4.40 0.142 0.157 0.173
N 2.20 0.086
O 2 0.079
R 1.70 0.067
R1 0.5 0.02
R2 0.3 0.12
R3 1.25 0.049
R4 0.50 0.019
V5°(Typ.)
V1 3° (Typ.)
V2 20°(Typ.)
V3 45°(Typ.)
(1): dam-bar protusion not included
(2): molding protusionincluded
OUTLINE AND
MECHANICAL DATA
Flexiwatt25
L2
H
V3
OL3 L4
V
C
H3
G
H1
G1
R3
H2
F
A
R4
N
V2
R2
R
L
L1
V1
R2
B
V
FLEX25ME
R1
L5
V1
R1 R1
E
M1
M
D
8/9
TDA7451
Information furnished is believed to be accurateand reliable. However, STMicroelectronics assumes no responsibility for the consequences
of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is
granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are
subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products
are not authorized for use as critical components in life supportdevices or systems without express written approval of STMicroelectronics.
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The ST logo is a registered trademark of STMicroelectronics
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