ST MICROELECTRONICS TDA 7297 Datasheet

Page 1
®
TDA7297
15+15W DUAL BRIDGE AMPLIFIER
WIDE SUPPLY VOLTAGE RANGE (6V -18V) MINIMUM EXTERNAL COMPONENTS
– NO SVR CAPACITOR – NO BOOTSTRAP – NO BOUCHEROT CELLS – INTERNALLY FIXED GAIN
DESCRIPTION
The TDA7297 is a dual bridge amplifier specially designed for TV and Portable Radio applications.
BLOCK AND APPLICATION DIAGRAM
0.22µF
IN1
ST-BY 7
4
TECHNOLOGY BI20II
Multiwatt 15
ORDERING NUMBER:
V
CC
133
+
-
1
470µF 100nF
OUT1+
TDA7297
IN2
MUTE 6
September 2003
0.22µF
S-GND
PW-GND
9
12
8
Vref
OUT1-
15
14
2
OUT2+
OUT2-
D94AU175B
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-
+
+
-
-
+
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TDA7297
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
I P T
T
stg
THERMAL DATA
Symbol Description Value Unit
R
th j-case
Supply Voltage 20 V
S
Output Peak Current (internally limited) 2 A
O
Total Power Dissipation (T
tot
Operating Temperature 0 to 70 °C
op
= 70°C) 33 W
case
, TjStorage and Junction Temperature -40 to +150 °C
Thermal Resistance Junction to case Typ. 1.4 Max. 2 °C/W
PIN CONNECTION
ELECTRICAL CHARACTERISTICS
(Top view)
15 14 13 12 11 10
9 8 7 6 5 4 3 2 1
= 16.5V, RL = 8Ω, f = 1kHz, T
(V
CC
D95AU261
OUT2+ OUT2­VCC IN2 N.C. N.C. S-GND PW-GND ST-BY MUTE N.C. IN1 V
CC
OUT1­OUT1+
amb
= 25°C unless otherwise
specified.)
Symbol Parameter Test Condition Min. Typ. Max. Unit
V
CC
I
q
V
OS
P
O
THD Total Harmonic Distortion P
SVR Supply Voltage Rejection f = 100Hz V
CT Crosstalk 46 60 dB
A
MUTE
T
W
G
V
Gv Voltage Gain Matching 0.5 dB
R
Supply Range 6.5 18 V Total Quiescent Current RL = 50 65 mA Output Offset Voltage 120 mV Output Power THD = 10% 13 15 W
= 1W 0.1 0.3 %
O
P
= 0.1W to 5W
O
1%
f = 100Hz to 15kHz
= 0.5V 40 56 dB
R
Mute Attenuation 60 80 dB Thermal Threshold 150 °C Closed Loop Voltage Gain 31 32 33 dB
Input Resistance 25 30 K
i
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TDA7297
ELECTRICAL CHARACTERISTICS
Symbol Parameter Test Condition Min. Typ. Max. Unit
VT VT
MUTE
ST-BY
I
ST-BY
e
N
Mute Threshold VO = -30dB 2.3 2.9 4.1 V St-by Threshold 0.8 1.3 1.8 V ST-BY current V6 = GND 100 µA Total Output Noise Voltage A curve
APPLICATION SUGGES TION
STAND-BY AND MUTE FUNCTIONS
(A) Microprocessor Application
In order to avoid annoying "Pop-Noise" during Turn-On/Off transients, it is necessary to guaran­tee the right St-by and mute signals sequence. It is quite simple to obtain this function using a mi­croprocessor (Fig. 1 and 2).
At first St-by signal (f rom mP) goes high and the voltage across the St-by terminal (Pin 7) starts t o increase exponentially. The external RC network is intended to turn-on slowly the biasing circuits of
Figure 1:
Microprocessor Application
(Continued)
f = 20Hz to 20kHz
150 220 500
the amplifier, this to avoid "POP" and "CLICK" on the outputs.
When this voltage reaches the St-by threshold level, the amplifier is switched-on and the external capacitors in series to the input terminals (C3, C5) start to charge.
It’s necessary to mantain the mute signal low until the capacitors are fully charged, this to avoid that the device goes in play mode causing a loud "Pop Noise" on the speakers.
A delay of 100-200ms between St-by and mute signals is suitable for a proper operation.
V
CC
µV µV
µP
IN1
ST-BY
IN2
MUTE
C1 0.22µF
R1 10K
C2
10µF
C3 0.22µF
R2 10K
C4
1µF
PW-GND
S-GND
4
7
9
12
6
8
Vref
133
15
14
1
OUT1+
OUT1-
2
OUT2+
OUT2-
+
-
-
+
+
-
-
+
C5
470µF
D95AU258A
C6
100nF
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Page 4
TDA7297
Figure 2:
Microprocessor Driving Signals.
+VS(V)
+18
V
IN
(mV)
V
ST-BY
pin 7
1.8
1.3
0.8
V
MUTE
pin 6
4.1
2.9
2.3
I
q
(mA)
V
OUT
(V)
OFF
ST-BY
MUTE
PLAY MUTE ST-BY
(B) Low Cost Application
In low cost applications where the mP is not pre­sent, the suggested circuit is shown in fig.3.
The St-by and mute terminals are tied together and they are connected to the supply line via an
OFF
D96AU259
external voltage divider. The device is switched-on/off from the supply line
and the external capacitor C4 is intended to delay the St-by and mute threshold exceeding, avoiding "Popping" problems.
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TDA7297
Figure 3:
Stand-alone Low-cost Application.
R1
47K
R2
47K
C3 0.22µF
IN1
ST-BY
C4
10µF
S-GND
C5 0.22µF
IN2
MUTE
4
7
9
12
6
Vref
V
CC
133
+
-
-
+
+
-
1
2
15
C1
470µFC2100nF
OUT1+
OUT1-
OUT2+
Figure 3b:
PW-GND
-
8
+
14
PCB and Component Layout of the Application Circuit (Fig. 1).
OUT2-
D95AU260A
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Page 6
)
TDA7297
Figure 4:
THD(%)
0.010
Figure 6:
THD(%)
10
0.1
0.010
Distortion vs Output Power
10
Vcc = 16.5V
1
0.1
0.1 1 10 20
Rl = 8 ohm
f = 15KH z
f = 5KHz
f = 1KHz
Pout (W)
Distortion vs Frequency
Vcc = 16.5V
1
100 1k 10k 20k
Rl = 8 ohm
Pout = 100mW
Pout = 5W
freq ue n c y (H z)
Figure 5:
THD(%)
10
0.1
0.010
Figure 7:
Level(dBr)
5.0000
4.0000
3.0000
2.0000
1.0000
0.0
-1.000
-2.000
-3.000
-4.000
-5.000
Distortion vs Output Power
Vcc = 12 V Rl = 8 ohm
1
f = 15KHz
f = 5KHz
f = 1KHz
0.1 1 10
Pout (W)
Frequency Respone
Vcc = 16.5V Rl = 8 ohm Pout = 1W
10 100 1k 10k 100k
frequency (Hz)
Figure 8:
Output Power vs Supply Voltage
Figure 9:
Total Power Dissipation & Efficiency vs
Output Power
Po(W
20.000
18.000
16.000
14.000
12.000
10.000
8.0000
6.0000
4.0000
2.0000
0.0
6.000 7.000 8.000 9.000 10.00 11.00 12.00 13.00 14.00 15 .00 16.00 17.00 18.00
Rl = 8 ohm f = 1KHz
d = 10%
d = 1%
Vs(V)
Ptot(W)
16 14 12
P tot
µ
10
8 6 4
Vcc = 16.5V Rl = 8ohm (both channels) f = 1KHz
2 0
012345678910111213141516
2XPout(W)
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µ(%)
80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5 0
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TDA7297
Figure 10:
10
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
11.522.533.544.55
Mute Attenuation vs. V pin.6
Attenuation (dB)
Vpin.6( V)
Figure 12:
Quiscent Current vs. Supply Voltage
Iq (m A)
70 65 60 55 50 45 40 35 30
6789101112131415161718
Vsupply(V)
Figure 11:
Attenuation (dB)
10
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4
Stand-By Attenuation vs Vpin.7
Vp in .7 (V )
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Page 8
TDA7297
DIM.
MIN. TYP. MAX. MIN. TYP. MAX.
A 5 0 .197 B 2.65 0.104 C 1.6 0.063 D 1 0.03 9 E 0.49 0.55 0 .019 0.022
F 0.66 0.75 0.026 0.030
G 1.02 1.27 1.52 0.040 0.050 0.060 G1 17.53 1 7.78 18.03 0.690 0.700 0.710 H1 19.6 0.772 H2 20.2 0.795
L 21.9 22.2 22.5 0.862 0.874 0.886 L1 21.7 22.1 22.5 0.854 0.870 0.886 L2 17.65 18.1 0.695 0.713 L3 17.25 17.5 17.75 0.679 0.68 9 0.699 L4 10.3 10.7 10.9 0.406 0.421 0.429 L7 2.65 2.9 0.104 0.114
M 4.25 4.55 4.85 0.167 0.179 0.191
M1 4.63 5.08 5.53 0.182 0.200 0.218
S 1.9 2.6 0.075 0.102
S1 1.9 2.6 0.075 0.102
Dia1 3.65 3.85 0.144 0.152
mm inch
OUTLINE AND
MECHANICAL DATA
Multiwatt15 V
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TDA7297
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