STMICROELECTRONICS TDA7267T

TDA7267T
2 W mono amplifier
Features
„
2 W output power into 8 Ω
at 12 V, THD = 10%
„
Internally fixed gain of 32 dB
„
No feedback capacitor
„
No boucherot cell
„
Thermal protection
„
AC short-circuit protection
„
SVR capacitor for better ripple rejection
„
Low turn-on/off “pop” noise
„
Standby mode
Table 1.
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Description
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The TDA7267T is a new technology mono audio
amplifier in a DIP-8 package specifically designed
for TV applications.
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Device summary
TDA7267T
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DIP-8 (4+4)
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Order code
Operating Temp. range
Pr
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0° to 70° C
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Thanks to the fully complementary output
configuration the device delivers a rail-to-rail
voltage swing without the need for boostrap
capacitors.
Package
DIP-8 (4+4)
Packaging
Tube
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May 2009
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www.st.com
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Block diagram and applications circuit
1
TDA7267T
Block diagram and applications circuit
Figure 1.
Applications circuit showing internal block diagram
VS=12V
VS
0.1 F
IN
IN
100 F
-
OUT
SVR
du
47 F
S-GND
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P-GND
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470 F
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Doc ID 15776 Rev 2
D94AU165
8Ω
TDA7267T
2
Pin description
Pin description
Figure 2.
Pin connection (top view, PCB view)
VS
1
8
GND
OUT
2
7
GND
SVR
3
6
GND
IN
4
5
GND
D94AU163
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Electrical specifications
TDA7267T
3
Electrical specifications
3.1
Absolute maximum ratings
Table 2.
Absolute maximum ratings
Symbol
3.2
Parameter
Value
VS
DC supply voltage
18
V
IO
Peak output current
1.5
A
Top
Operating temperature range
0 to 70
°C
Tj
Junction temperature
150
Tstg
Storage temperature range
-40 to 150
Table 3.
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°C
°C
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Thermal data
Thermal data
Symbol
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Parameter
bs
Min
Typ
Max
Unit
Rth j-amb
Thermal resistance, junction to ambient (on PCB)
-
76
-
°C/W
Rth j-case
Thermal resistance, junction to case pin (6 or 7)
-
23
-
°C/W
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Electrical specifications
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3.3
Unit
Unless otherwise stated, the results in Table 4 below are given for the conditions: VS = 12 V,
RL = 8 Ω, f = 1 kHz and Tamb = 25° C.
Table 4.
Symbol
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Electrical specifications
Parameter
Condition
Min
Typ
Max
Unit
VS
Supply voltage range
-
4.5
-
18
V
Iq
Total quiescent current
-
-
20
30
mA
ISTBY
Current in standby
Pin 3 shorted to GND
-
-
0.3
mA
VO
Quiescent output voltage
-
-
6
-
V
AV
Voltage gain
-
-
32
-
dB
RIN
Input resistance
-
-
100
-
kΩ
PO
Output power
THD = 10%
1.8
2.0
-
W
THD
Total harmonic distortion
PO = 1 W
-
-
1.0
%
SVR
Supply voltage rejection
fripple = 1 kHz,
Vripple = 150 mV RMS
-
50
-
dB
Doc ID 15776 Rev 2
TDA7267T
Electrical specifications
Table 4.
Electrical specifications (continued)
Symbol
Parameter
Condition
Min
Typ
Max
Unit
EI
Input noise voltage
RG = 10 kΩ,
BW = 20 Hz to 20 kHz
-
1.5
5.0
µV
VSTBY
Standby enable voltage
-
-
-
1.0
V
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Applications information
4
TDA7267T
Applications information
For 12-V supply and 8-Ω speaker applications the maximum power dissipation is
approximately 1.2 W.
Assuming that the maximum ambient temperature is 70° C the required thermal resistance
of the devices must be equal to (150 - 70) / 1.2 = 67 °C/W.
The junction-to-pin thermal resistance of the package is about 23 °C/W. This means that an
external heatsink of around 43 °C/W is required.
The copper ground plane of the PCB can be used for dissipating this heat.
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Standby switches must be able to discharge the CSVR current.
Figure 3.
Thermal resistance junction-to-ambient vs copper area on PCB
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80.00
78.00
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76.00
Rth j-a (oC/W)
74.00
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72.00
70.00
68.00
66.00
64.00
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(s
62.00
60.00
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1
1.5
2
2.5
3
3.5
4
Cu Area on PCB (cm2)
Power derating curve
2.20
2.00
Maximum Power Dissipation (W)
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Pr
Figure 4.
0.5
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1.80
Copper Area 3 Cm2
1.60
1.40
1.20
1.00
0.80
0.60
NO Copper Area (others than tracks)
0.40
0.20
0.00
0
10
20
30
40
50
60
70
80
90
Tambient (oC)
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100 110 120 130 140 150 160
TDA7267T
Applications information
Figure 5.
Power dissipation vs output power
1.50
1.40
1.30
Power Dissipation (W)
1.20
1.10
1.00
0.90
0.80
VS = 12V
F = 1 KHz
Rl = 8 Ohm
0.70
0.60
0.50
0.40
0.30
0.20
0.10
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0.00
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
Output Power (W)
1.8
2
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Package mechanical data
5
TDA7267T
Package mechanical data
The TDA7267T comes in a 8-pin DIP package.
Figure 6 below gives the package outline and dimensions.
Figure 6.
DIP-8 outline drawing and dimensions
mm
inch
OUTLINE AND
MECHANICAL DATA
DIM.
MIN.
A
TYP.
MAX.
MIN.
3.32
TYP.
MAX.
0.131
a1
0.51
B
1.15
1.65
0.045
0.065
b
0.356
0.55
0.014
0.022
b1
0.204
0.304
0.008
D
7.95
9.75
0.313
0.384
e
2.54
0.100
7.62
0.300
e4
7.62
0.300
6.6
I
5.08
L
3.18
3.81
1.52
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0.260
0.200
)-
0.125
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0.430
e3
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0.012
10.92
E
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0.020
0.150
DIP-8
0.060
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In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
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TDA7267T
6
Revision history
Revision history
Table 5.
Document revision history
Date
Revision
Changes
Dec-2005
1
Initial release.
29-May-2009
2
Updated temperature to 70° C in Chapter 4 on page 6.
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TDA7267T
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Please Read Carefully:
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