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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
* 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. * Short circuit protection. * Thermal shutdown protection.
HSIP-15 HSIP-11
APPLICATIONS
* Hi-Fi music centers * Stereo TV sets
ORDERING INFORMATION
Part No. SA7267 SA7267A Package HSIP-11 HSIP-15
BLOCK DIAGRAM
Note: Figures for the SA7267.
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SA7267
ABSOLUTE MAXIMUM RATING
Characteristics DC Supply Voltage Output Peak Current (Internally Limited) Power Dissipation Tcase=70C Storage And Junction Temperature Supply voltage to guarantee short-circuit protection Thermal Resistance From Junction To Case (Max) normal. Symbol Vs Io Ptot Tstg, Tj Vs(sc) Rth(j-c) Rating 40 3 40 -40~+150 18(*) 2 Unit V A W C V C/W
(*)Maximum supply voltage to guarantee short-circuit to Vs is 18V, and to GND short-circuit protection is
ELECTRICAL CHARACTERISTICS
(Refer to the test circuit, Vs=15V; RL=4; Rs=50; Gv=30dB; f=1KHz; Tamb=25C, unless otherwise specified.) Characteristics Supply Range Total Quiescent Current Input Offset Voltage In-phase Input Bias Current Output Power Symbol Vs Iq Vos Ib THD=10%; Po RL=4; RL=8 RL=8; Po=1W; f=1KHz RL=8; Po=0.1~5W; Total Harmonic Distortion THD f=100Hz~15KHz RL=4; Po=1W; f=1KHz RL=4; Po=0.1~5W; f=100Hz~15KHz Cross Talk Slew Rate Open Loop Voltage Gain Total Noise Input Voltage Input Resistance Supply Voltage Rejection (each channel) CT SR GV eN Ri SVR Fr=100Hz; Vripple=0.5Vrms A curve f=20Hz~22KHz 15 f=1KHz f=10KHz 50 6.5 70 60 8 80 3 4 20 60 8 dB dB V/s dB V V K dB
(To be continued)
Test conditions
Min. 5
Typ. 50
Max. 20 100 +25
Unit V mA mV nA W W %
-25 500 20 12.5 0.03
0.7
%
0.02 1
% %
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SA7267
(Continued)
Characteristics Thermal Shut-down Junction Temperature Mute Function [ref: +Vs] Mute /Play Threshold Mute Attenuation Stand-by Function [ref: +Vs] Stand-by /Mute Threshold Stand-by Attenuation Quiescent Current @ Stand-by
Symbol Tj
Test conditions
Min.
Typ. 145
Max.
Unit C
VTMUTE AM VTST-BY AST-BY Iq ST-BY
-7 60 -3.5
-6 70 -2.5 110 3
-5
V dB
-1.5 6
V dB mA
PIN CONFIGURATION
PIN DESCRIPTION
Pin No. HSIP-11 1 2 3 4 5 HSIP-15 2 3 5 6 7 Pin Name -Vs OUT 1 +Vs OUT 2 MUTE / ST-BY I/O -O -O I Pin Description Negative power Output1 Positive power Output2 Mute /stand-by function
(To be continued)
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SA7267
(Continued)
Pin No. HSIP-11 6 7 8 9 10 11 HSIP-15 8 9 10 12 13 14 1,4,11,15
Pin Name -Vs IN+(2) IN-(2) GND IN-(1) IN+(1) NC
I/O -I I -I I --
Pin Description Negative power Inverting Input 2 Non inverting input 2 Ground Non inverting input 1 Inverting input 1 Not connected
FUNCTION DESCRIPTION
MUTE STAND-BY FUNCTION The MUTE/ST-BY controls the amplifier status by two different thresholds, referred to +Vs. O O O When MUTE/ST-BY higher than +Vs - 2.5V, the amplifier is in Stand-by mode and the final stage generators are off. When MUTE/ST-BY is between +Vs - 2.5V and +Vs- 6V, the final stage current generators are switched on and the amplifier is in mute mode 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)=Vs2/2RL+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 4, it can develop up to 24.5W of internal power dissipation. If the die temperature is to remain below 150C for ambient temperatures up to 50C, the total junction-to-ambient thermal resistance must be less than: (150C 50C)/24.5W 4.1C/W Using Rth(j-c) = 2C /W, the sum of the case-to-heat-sink interface thermal resistance and the heat-sink-toambient thermal resistance must be less than 2.1C/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 1C /W if use the thermal resistance, and about 1.2C /W if not. If a mica insulator is used, the thermal resistance will be about 1.6C /W lubricated and 3.4C /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: 4.1C/W-2C/W-1.6C/W 0.5C/W
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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 1.1C /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 60 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 8 and a phase angle of 60. The real part of this load will then be 4, and the amplifier power dissipation will roughly follow the curve of power dissipation with a 4 resistor.
TYPICAL APPLICATION CIRCUIT IN SPLIT SUPPLY
Note: Figures for the SA7267.
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SA7267
TYPICAL APPLICATION CIRCUIT IN SINGLE SUPPLY
Note: Figures for the SA7267.
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SA7267
ELECTRICAL CHARACTERISTICS CURVES
Quiescent current vs. supply voltage
48 45 42 Ampl.(dB) Iq(mA) 39 36 33 30 4 6 8 10 12 14 16 18 20 1 -0.5 -2.0 -3.5 -5.0 -6.5 -8.0 -9.5 -11.0 -12.5 -14.0 20
Frequency response
Vs=20V RL=8.2 0dB=1W
200
2,000
20,000
200,000
VS(V)
Freq(Hz)
Output power vs. supply voltage
20 RL=8 F=1KHz 16 1
THD vs. output power
Vs=20V RL=8.2 f=15KHz
Pout(W)
THD=10% 8 THD=1% 4
THD(%)
12
0.1
f=100Hz f=1KHz
0.01
0
4
6
8
10
12
14
16
18
20
0.001 0
2
4
6
8
10 12 14 16 18
20
Vs(V)
Pout (W)
Quiescent current vs. pin 5 voltage
50 45 40 35 Iq(mA) 30 25 20 15 10 5 0 -7 -6 -5 -4 -3 -2 -1 0 Vs=20V RL=8 x 2 0V=+Vs Vi=0 180 160 140 Attenuation (dB) 120 100 80 60 40 20 0 -7
Attenuation vs. pin 5 voltage
F=1KHz Vs=20V RL=8.2 0dB=1W 0V=+Vs
-6
-5
-4
-3
-2
-1
0
Vpin 5(V)
Vpin 5(V)
(To be continued)
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SA7267
(Continued)
Power dissipation (W)
PC BOARD AND COMPINENTS LAYOUT OF THE TYPICAL APPLICATION IN SPLIT SUPPLY
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Power dissipation (W)
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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 10K 15K 18K 15K 18K 560 4.7 1F 1F 1000F 0.1F 0.1F 5.1V BC107 25dB. LARGER THAN PURPOSE RECOMMENDED VALUE Mute Circuit Mute Circuit Mute Circuit Mute Circuit Closed Loop Gain Setting* Frequency Stability Input DC Decoupling St-By/Mute Time Constant Supply Bypass Supply Bypass Frequency Stability Mute Circuit Mute Circuit Larger On/Off Time Increase of Dz Biasing Current VMUTE/STBY Shifted Downward VMUTE/STBY Shifted Upward VMUTE/STBY Shifted Upward Increase of Gain Decrease of Gain Danger of Oscillations Danger of Oscillations Higher Low Frequency Cutoff Smaller On/Off Time Danger of Oscillations Danger of Oscillations VMUTE/STBY Upward VMUTE/STBY Downward VMUTE/STBY Downward Shifted Shifted Shifted SMALLER THAN RECOMMENDED VALUE
R1 R2 R3 R4 R5, R8 R6, R9 R7, R10 C1, C2 C3 C4, C6 C5, C7 C8, C9 Dz Q1
* Closed loop gain has to be
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SA7267
PACKAGE OUTLINE
HSIP-11 Unit: mm
HSIP-15
19.900.20 4.000.15 1.500.10
Unit: mm
3.750.10
2.800.20
10.700.25
17.750.25
18.680.35
22.100.40
0.70
2.500.15
1.000.15
1.270.15 20.050.20
0.40 4.300.30 5.080.35
0.500.10
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4.600.20
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22.300.30
2006.05.25 Page 10 of 11

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