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SA7264
2-CH AUDIO POWER AMPLIFIER(25W X2 )
DESCRIPTION
The SA7264 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 50V ABS MAX. * Split supply operation. * High output power: 25 + 25W @ THD=10%,RL=8 ,VS=20V * Mute/stand-by function. * Few external components. * Short circuit protection. * Thermal overload protection.
HSIP-11
HSIP-8
HSIP-15
APPLICATIONS
* Hi-Fi music centers * Stereo TV sets
ORDERING INFORMATION
Part No. SA7264 SA7264A SA7264B Package HSIP-8 HSIP-15 HSIP-11
BLOCK DIAGRAM
Note: Figures for the SA7264.
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SA7264
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) Ratings 50 4.5 30 -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, Vs20V; RL=8; Rs=50; f=1KHz; Tamb=25C,
unless otherwise specified.) Characteristics Supply Range Total Quiescent Current Music Output Power(*) Symbol Vs Iq Po THD=10%;RL=8; Vs=22.5V THD=10%; Output Power Po RL=8; Vs=16V; RL=4 THD=1%; Output Power Po RL=8; Vs=16V; RL=4 RL=8; Po=1W; f=1kHz RL=8; Po=0.1~15W; Total Harmonic Distortion THD f=100Hz~15kHz RL=4; Po=1W; f=1kHz RL=4; Vs=16V; Po=0.1~12W; f=100Hz~15kHz Cross Talk Slew Rate Closed Loop Voltage Gain CT SR GV 29 f=1kHz f=10kHz 70 60 10 30 31 dB dB V/s dB 0.03 1 % % 20 20 0.02 0.5 W W % % 20 25 25 W W Test conditions Min. 5 80 32 Typ. Max. 22.5 130 Unit V mA W
(To be continued)
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SA7264
(Continued)
Characteristics Voltage Gain Matching Total Input Noise Input Resistance Supply Voltage Rejection (each channel) 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 @ St-by Note:
Symbol GV eN Ri SVR Tj
Test conditions A curve f=20Hz~22kHz
Min.
Typ. 0.2 2.5 3.5
Max.
Unit dB V
8
V k dB C
15 fr=100Hz; Vripple=0.5Vrms
20 60 145
VTMUTE AM VTST-BY AST-BY Iq ST-BY
-7 60 -3.5
-6 90 -2.5 110 3
-5
V dB
-1.5
V dB mA
* Music Output Power is the maximal power which the amplifier is capable of producing across the rated load resistance (regardless of non linearity) 1 sec after the application of a sinusoidal input signal of frequency 1KHz. According to this definition, the method of measurement comprises the following steps: 1) Set the voltage supply at the maximum operating value -10% 2) Apply a input signal in the form of a 1KHz tone burst of 1 sec duration; the repetition period of the signal pulses is > 60 sec 3) The output voltage is measured 1 sec from the start of the pulse 4) Increase the input voltage until the output signal show a THD = 10% 5) The music power is then Vout2/RL, where Vout is the output voltage measured in the condition of point 4) and R1 is the rated load impedance The target of this method is to avoid excessive dissipation in the amplifier.
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SA7264
PIN CONFIGURATION
Note: Tab connected to -Vs.
PIN DESCRIPTION
Pin No. HSIP-8 8 6 1 3 7 2 5 4 HSIP-11 11 7 2 4 9 3 1, 6 5 8, 10 HSIP-15 13 10 3 6 12 5 2, 8 7 1, 4, 9, 11, 14, 15 Pin name IN 1 IN2 OUT 1 OUT 2 GND +Vs -Vs MUTE / STBY NC Input 1 Input 2 Output1 Output2 Ground Positive power Negative power Mute /stand-by function Not connected Pin description
FUNCTION DESCRIPTION
MUTE STAND-BY FUNCTION The PIN mute/st_by controls the amplifier status by two different thresholds, referred to +Vs. O O O When Vmute/st_by higher than +Vs - 2.5V the amplifier is in Stand-by mode and the final stage generators are off When Vmute/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 Vmute/st_by is lower than +Vs - 6V the amplifier is play mode.
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SA7264
POWER DISSIPATION AND HEAT SINKING The SA7264 must always be operated with a heat sink, even when it is not required to drive a load. The idling current of the device is 80mA, so that on a 20V power supply an unloaded SA7264 must dissipate about 3W of power. The 54C/W junction-to-ambient thermal resistance of a HSIP-11 package would cause the die temperature to rise 162C above ambient, so the thermal protection circuitry will shut the amplifier down if operation without a heat sink is attempted. In order to determine the appropriate heat sink for a given application, the power dissipation of the SA7264 in that application must be known. When the load is resistive, the maximum average power that the IC will be required to dissipate is approximately: PD(MAX)=Vs2/2RL+PQ Where VS is the total power supply voltage across the SA7264, RL is the load resistance PQ is the quiescent power dissipation of the amplifier. The above equation is only an approximation which assume 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 behaviour of the SA7264 with various power supply voltages and resistive loads. As an example, if the SA7264 is operated on a 20V power supply with a resistive load of 8, it can develop up to 23W 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)/23W 4.3C/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 2.3C/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 lubricated, and about 1.2C /W if dry. 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 SA7264 and the heat sink. The heat sink thermal resistance must then be less than: 4.3C/W-2C/W-1.6C/W 0.7C/W
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, there is an alternative. 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 1.3C /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 an 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 load.
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SA7264
TYPICAL APPLICATION CIRCUIT SA7264
+Vs C4 1000 F 2 +Vs Mute/standby 4 MUTE/ST-BY OUT 2 3 R5 4.7 IN2 C1 1F 7 GND OUT 1 1 IN1 C2 1F 8 IN1 -Vs 5 C6 1000 F C7 0.1 F C9 100nF R6 4.7 6 IN2 C5 0.1 F
SA7264
C8 100nF
+Vs SW1 B A R1 10K Dz SW2 A B B A Play R4 15K R3 18K R2 15K Q1 C3 1F SW1 Mute/standby A A B SW2 A B B Stand-by Stand-by Mute
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SA7264
TYPICAL APPLICATION CIRCUIT SA7264B
ELECTRICAL CHARACTERISTICS CURVES
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SA7264
Output Power vs. Operating Voltage
32 28 24 Pout(W) THD(%) 20 16 12 8 4 0 4 6 8 10 12 14 16 18 0.001 024 THD=10% THD=1% 0.01 RI=3.9 f=1KHz 1 10
THD vs. Output Power
Vs=16V RL=3.9 f=15KHz 0.1 f=100Hz
f=1KHz
6 8 10 12 14 16 18 20 22 24 26
Vs(V)
Pout (W)
Output Power vs. Operating Voltage
40 36 32 28 Pout(W) THD(%) 24 20 16 12 8 4 0 4 6 8 10 12 14 16 18 20 22 24 26 0.001 024 THD=1% 0.01 THD=10% RL=8 F=1KHz 1 10
THD vs. Output Power
Vs=20V RL=8.2
f=15KHz 0.1 f=100Hz f=1KHz
6 8 10 12 14 16 18 20 22 24 26
Vs(V)
Pout (W)
Quiescent Current vs. mute/standby Voltage
50 45 180 160 Vs=20V RL=8 x 2 0V=+Vs Vi=0 140
Attenuation vs. mute/standby Voltage
Quiescent Current (mA)
40 35 30 25 20 15 10 5 0 -7 -6
Attenuation (dB)
120 100 80 60 40 20
F=1KHz Vs=20V RL=8.2 0dB=1W 0V=+Vs
-5
-4
-3
-2
-1
0
0
-7
-6
-5
-4
-3
-2
-1
0
Mute/standby(V)
Mute/standby(V)
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SA7264
PC BOARD AND COMPINENTS LAYOUT OF SA7264
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SA7264
PC BOARD AND COMPINENTS LAYOUT OF SA7264B
APPLICATION SUGGEST The recommended values of the external components are those shown are the Typical Application Circuit COMPONENTS R1 R2 R3 R4 R5, R6 RECOMMENDED VALUE 10K 15K 18K 15K 4.7 PURPOSE Mute Circuit Mute Circuit Mute Circuit Mute Circuit Frequency Stability LARGER THAN RECOMMENDED VALUE Increase of Dz Biasing Current VMUTE/STBY Downward VMUTE/STBY Upward VMUTE/STBY Upward Danger of Oscillations Shifted Shifted Shifted VMUTE/STBY Upward VMUTE/STBY Downward VMUTE/STBY Downward Danger of Oscillations
(To be continued)
SMALLER THAN RECOMMENDED VALUE
Shifted Shifted Shifted
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SA7264
(Continued)
COMPONENTS C1, C2
RECOMMENDED VALUE 1F
PURPOSE Input DC Decoupling St-By/Mute Time Constant Supply Bypass Supply Bypass Frequency Stability Mute Circuit Mute Circuit
LARGER THAN RECOMMENDED VALUE
SMALLER THAN RECOMMENDED VALUE Higher Low Frequency Cutoff
C3
1F
Larger On/Off Time
Smaller On/Off Time
C4, C6 C5, C7 C8, C9 Dz Q1
1000F 0.1F 0.1F 5.1V BC107
Danger of Oscillations Danger of Oscillations
PACKAGE OUTLINE
HSIP-8
4.600.10 19.900.20 1.500.03
Unit: mm
3.400.05
2.54
0.8 19.950.20
0.32 2.500.08
0.510.02
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SA7264
PACKAGE OUTLINE
HSIP-11 Unit: mm
HSIP-15
Unit: mm
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