SILAN SA7267A

SA7267
2-CH AUDIO POWER AMPLIFIER(20W X 2)
DESCRIPTION
The SA7267 is a monolithic integrated circuit in HSIP package,
intended for use as dual audio frequency class AB amplifier.
FEATURES
HSIP-11
* Wide supply voltage range(up to ±20V )
* Split supply operation.
* High output power: 20W+20W @ THD=10%, RL=4 , Vs=±15V
* Mute/stand-by function.
* Few external components.
HSIP-15
* Short circuit protection.
* Thermal shutdown protection.
APPLICATIONS
ORDERING INFORMATION
* Hi-Fi music centers
Part No.
* Stereo TV sets
Package
SA7267
HSIP-11
SA7267A
HSIP-15
BLOCK DIAGRAM
Note: Figures for the SA7267.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
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Page 1 of 11
SA7267
ABSOLUTE MAXIMUM RATING
Characteristics
Symbol
Rating
Unit
DC Supply Voltage
Vs
40
V
Output Peak Current (Internally Limited)
Io
3
A
Ptot
40
W
Tstg, Tj
-40~+150
°C
Vs(sc)
±18(*)
V
Rth(j-c)
2
°C/W
Power Dissipation Tcase=70°C
Storage And Junction Temperature
Supply voltage to guarantee short-circuit
protection
Thermal Resistance From Junction To
Case (Max)
(*)Maximum supply voltage to guarantee short-circuit to ±Vs is ±18V, and to GND short-circuit protection is
normal.
ELECTRICAL CHARACTERISTICS
(Refer to the test circuit, Vs=±15V; RL=4Ω; Rs=50Ω; Gv=30dB; f=1KHz; Tamb=25°C, unless otherwise specified.)
Characteristics
Symbol
Supply Range
Vs
Total Quiescent Current
Iq
Input Offset Voltage
In-phase Input Bias Current
Test conditions
Min.
Typ.
Max.
±5
50
Vos
-25
Ib
Unit
±20
V
100
mA
+25
mV
500
nA
RL=4Ω;
20
W
RL=8Ω
12.5
W
RL=8Ω; Po=1W; f=1KHz
0.03
%
THD=10%;
Output Power
Po
0.7
RL=8Ω;
%
Po=0.1~5W;
Total Harmonic Distortion
THD
f=100Hz~15KHz
RL=4Ω; Po=1W; f=1KHz
0.02
%
1
RL=4Ω;
%
Po=0.1~5W;
f=100Hz~15KHz
Cross Talk
CT
Slew Rate
SR
Open Loop Voltage Gain
GV
Total Noise Input Voltage
eN
Input Resistance
Ri
Supply Voltage Rejection (each
channel)
SVR
f=1KHz
f=10KHz
50
6.5
70
dB
60
dB
8
V/µs
80
dB
A curve
3
µV
f=20Hz~22KHz
4
15
Fr=100Hz; Vripple=0.5Vrms
8
µV
20
KΩ
60
dB
(To be continued)
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SA7267
(Continued)
Characteristics
Thermal
Shut-down
Symbol
Junction
Temperature
Test conditions
Min.
Tj
Typ.
Max.
Unit
°C
145
Mute Function [ref: +Vs]
Mute /Play Threshold
Mute Attenuation
VTMUTE
-7
-6
AM
60
70
VTST-BY
-3.5
-2.5
-5
V
dB
Stand-by Function [ref: +Vs]
Stand-by /Mute Threshold
Stand-by Attenuation
AST-BY
110
Quiescent Current @ Stand-by
Iq ST-BY
3
-1.5
V
dB
6
mA
PIN CONFIGURATION
PIN DESCRIPTION
Pin No.
Pin Name
I/O
2
-Vs
--
Negative power
2
3
OUT 1
O
Output1
3
5
+Vs
--
Positive power
4
6
OUT 2
O
Output2
5
7
MUTE / ST-BY
I
Mute /stand-by function
HSIP-11
HSIP-15
1
Pin Description
(To be continued)
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SA7267
(Continued)
Pin No.
Pin Name
I/O
8
-Vs
--
7
9
IN+(2)
I
Inverting Input 2
8
10
IN-(2)
I
Non inverting input 2
9
12
GND
--
Ground
10
13
IN-(1)
I
Non inverting input 1
11
14
IN+(1)
I
Inverting input 1
1,4,11,15
NC
--
Not connected
HSIP-11
HSIP-15
6
Pin Description
Negative power
FUNCTION DESCRIPTION
MUTE STAND-BY FUNCTION
The MUTE/ST-BY controls the amplifier status by two different thresholds, referred to +Vs.
Ø
When MUTE/ST-BY higher than +Vs - 2.5V, the amplifier is in Stand-by mode and the final stage
Ø
When MUTE/ST-BY is between +Vs - 2.5V and +Vs- 6V, the final stage current generators are
generators are off.
switched on and the amplifier is in mute mode
Ø
When MUTE/ST-BY is lower than +Vs - 6V, the amplifier is in play mode.
Power Dissipation and Heat Sinking
The SA7267 must always be operated with a heat sink. In order to determine the appropriate heat sink for a
given application, the power dissipation of the SA7267 in that application must be known. When the load is a
resistor, the maximum average power of the IC is approximately:
PD(MAX)=Vs2/π2RL+PQ
Where VS is the total power supply voltage across the SA7267, RL is the load resistance and PQ is the
quiescent power dissipation of the amplifier. The above equation is only an approximation which assumes an
“ideal”class B output stage and constant power dissipation in all other parts of the circuit. The curves of “Power
Dissipation vs. Power Output”give a better representation of the behavior of the SA7267 with various power
supply voltages and resistors. As an example, if the SA7267 is operated on a ±15V power supply with a
resistance of 4Ω, it can develop up to 24.5W of internal power dissipation. If the die temperature is to remain
below 150°C for ambient temperatures up to 50°C, the total junction-to-ambient thermal resistance must be less
than:
(150°C 50°C)/24.5W
4.1°C/W
Using Rth(j-c) = 2°C /W, the sum of the case-to-heat-sink interface thermal resistance and the heat-sink-toambient thermal resistance must be less than 2.1°C/W. The case-to-heat-sink thermal resistance of the HSIP-11
package varies with the mounting method used. A metal-to-metal interface will be about 1°C /W if use the thermal
resistance, and about 1.2°C /W if not.
If a mica insulator is used, the thermal resistance will be about 1.6°C /W lubricated and 3.4°C /W dry. For this
example, we assume a lubricated mica insulator between the SA7267 and the heat sink. The heat sink thermal
resistance must then be less than:
4.1°C/W-2°C/W-1.6°C/W
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0.5°C/W
REV:1.1
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Page 4 of 11
SA7267
This is a rather large heat sink and may not be practical in some applications. If a smaller heat sink is required
for reasons of size or cost, the heat sink can be isolated from the chassis so the mica washer is not needed. This
will change the required heat sink to a 1.1°C /W unit if the case-to-heat-sink interface is lubricated.
The thermal requirements can become more difficult when an amplifier is driving a reactive load. For a given
magnitude of load impedance, a higher degree of reactance will cause a higher level of power dissipation within
the amplifier. As a general rule, the power dissipation of an amplifier driving a 60º reactive load (usually
considered to be a worst-case loudspeaker load) will be roughly that of the same amplifier driving the resistive
part of that load. For example, a loudspeaker may at some frequency have impedance with a magnitude of 8Ω
and a phase angle of 60º. The real part of this load will then be 4Ω, and the amplifier power dissipation will
roughly follow the curve of power dissipation with a 4Ω resistor.
TYPICAL APPLICATION CIRCUIT IN SPLIT SUPPLY
Note: Figures for the SA7267.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
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SA7267
TYPICAL APPLICATION CIRCUIT IN SINGLE SUPPLY
Note: Figures for the SA7267.
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SA7267
ELECTRICAL CHARACTERISTICS CURVES
Frequency response
Quiescent current vs. supply voltage
48
1
-0.5
45
-2.0
-3.5
-5.0
Ampl.(dB)
Iq(mA)
42
39
Vs=±20V
RL=8.2
0dB=1W
-6.5
-8.0
36
-9.5
-11.0
33
-12.5
30
4
6
8
10
12
14
16
18
-14.0
20
20
200
2,000
20,000
VS(±V)
Freq(Hz)
Output power vs. supply voltage
THD vs. output power
200,000
20
RL=8
F=1KHz
Vs=±20V
RL=8.2
1
16
12
THD(%)
Pout(W)
f=15KHz
THD=10%
8
THD=1%
f=100Hz
0.1
f=1KHz
0.01
4
0
4
6
8
10
12
14
16
18
0.001
0
20
2
4
6
Vs(±V)
180
45
160
25
Attenuation (dB)
Iq(mA)
140
Vs=±20V
RL=8 x 2
0V=+Vs
Vi=0
30
20
15
100
80
60
40
5
20
-7
-6
-5
-4
-3
-2
-1
0
F=1KHz
Vs=±20V
RL=8.2
0dB=1W
0V=+Vs
120
10
0
20
Attenuation vs. pin 5 voltage
Quiescent current vs. pin 5 voltage
35
10 12 14 16 18
Pout (W)
50
40
8
0
Vpin 5(V)
-7
-6
-5
-4
-3
-2
-1
0
Vpin 5(V)
(To be continued)
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SA7267
Power dissipation (W)
Power dissipation (W)
(Continued)
PC BOARD AND COMPINENTS LAYOUT OF THE TYPICAL APPLICATION IN SPLIT SUPPLY
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SA7267
APPLICATION SUGGEST
The recommended values of the external components shown are the Typical Application Circuit in Split
Supply:
COMPONENTS
RECOMMENDED
VALUE
LARGER THAN
PURPOSE
RECOMMENDED
SMALLER THAN
RECOMMENDED
VALUE
VALUE
Increase of Dz
R1
10KΩ
Mute Circuit
R2
15KΩ
Mute Circuit
R3
18KΩ
Mute Circuit
R4
15KΩ
Mute Circuit
R5, R8
18KΩ
Closed Loop Gain
Increase of Gain
R6, R9
560Ω
Setting*
Decrease of Gain
R7, R10
4.7Ω
C1, C2
1µF
C3
1µF
C4, C6
1000µF
Supply Bypass
Danger of Oscillations
C5, C7
0.1µF
Supply Bypass
Danger of Oscillations
C8, C9
0.1µF
Dz
5.1V
Mute Circuit
Q1
BC107
Mute Circuit
* Closed loop gain has to be
Frequency
Stability
Biasing Current
VMUTE/STBY Shifted
VMUTE/STBY
Downward
Upward
VMUTE/STBY Shifted
VMUTE/STBY
Upward
Downward
VMUTE/STBY Shifted
VMUTE/STBY
Upward
Downward
Danger of Oscillations
Shifted
Shifted
Danger of Oscillations
Input DC
Higher Low Frequency
Decoupling
Cutoff
St-By/Mute Time
Constant
Larger On/Off Time
Smaller On/Off Time
Frequency
Stability
25dB.
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Shifted
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SA7267
PACKAGE OUTLINE
HSIP-11
Unit: mm
HSIP-15
Unit: mm
19.90±0.20
0.70
22.30±0.30
22.10±0.40
18.68±0.35
10.70±0.25
17.75±0.25
3.75±0.10
1.00±0.15
2.80±0.20
4.00±0.15
1.50±0.10
2.50±0.15
1.27±0.15
0.50±0.10
0.40
4.30±0.30 5.08±0.35
4.60±0.20
20.05±0.20
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
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