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 HSIP-8 * 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. HSIP-11 HSIP-15 * Short circuit protection. * Thermal overload protection. APPLICATIONS * Hi-Fi music centers * Stereo TV sets ORDERING INFORMATION Part No. Package SA7264 HSIP-8 SA7264A HSIP-15 SA7264B HSIP-11 BLOCK DIAGRAM Note: Figures for the SA7264. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.1 2006.05.25 Page 1 of 13 SA7264 ABSOLUTE MAXIMUM RATING Characteristics DC Supply Voltage Output Peak Current (Internally Limited) Power Dissipation Tcase=70°C Storage And Junction Temperature Supply voltage to guarantee short-circuit protection Thermal Resistance From Junction To Case (Max) Symbol Ratings Unit Vs 50 V Io 4.5 A Ptot 30 W Tstg, Tj -40~+150 °C Vs(sc) ±18(*) V Rth(j-c) 2 °C/W (*)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±20V; RL=8Ω; Rs=50Ω; f=1KHz; Tamb=25°C, unless otherwise specified.) Characteristics Symbol Supply Range Vs Total Quiescent Current Iq Music Output Power(*) Po Test conditions Min. Typ. ±5 80 THD=10%;RL=8Ω; Max. Unit ±22.5 V 130 mA 32 W 25 W 25 W RL=8Ω; 20 W Vs=±16V; RL=4Ω 20 W 0.02 % Vs=±22.5V THD=10%; Output Power Po RL=8Ω; 20 Vs=±16V; RL=4Ω THD=1%; Output Power Po RL=8Ω; Po=1W; f=1kHz 0.5 RL=8Ω; % Po=0.1~15W; Total Harmonic Distortion THD f=100Hz~15kHz RL=4Ω; Po=1W; f=1kHz 0.03 % 1 RL=4Ω; Vs=±16V; % Po=0.1~12W; f=100Hz~15kHz Cross Talk CT Slew Rate SR Closed Loop Voltage Gain GV f=1kHz 70 dB f=10kHz 60 dB 10 V/µs 29 30 31 dB (To be continued) HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.1 2006.05.25 Page 2 of 13 SA7264 (Continued) Characteristics Voltage Gain Matching Symbol eN Input Resistance Ri (each channel) Min. ∆GV Total Input Noise Supply Voltage Rejection Test conditions SVR Thermal Shut-down Junction Max. 0.2 A curve 2.5 f=20Hz~22kHz 3.5 15 fr=100Hz; Vripple=0.5Vrms Tj Temperature Typ. Unit dB µV µV 8 20 kΩ 60 dB 145 °C Mute Function [ref: +Vs] Mute /Play Threshold VTMUTE -7 -6 AM 60 90 Stand-by /Mute Threshold VTST-BY -3.5 -2.5 Stand-by Attenuation AST-BY 110 dB Quiescent Current @ St-by Iq ST-BY 3 mA Mute Attenuation -5 V dB Stand-by Function [ref: +Vs] -1.5 V Note: * 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. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.1 2006.05.25 Page 3 of 13 SA7264 PIN CONFIGURATION Note: Tab connected to –Vs. PIN DESCRIPTION Pin No. Pin name Pin description HSIP-8 HSIP-11 HSIP-15 8 11 13 IN 1 Input 1 6 7 10 IN2 Input 2 1 2 3 OUT 1 Output1 3 4 6 OUT 2 Output2 7 9 12 GND Ground 2 3 5 +Vs Positive power 5 1, 6 2, 8 -Vs Negative power 4 5 7 8, 10 1, 4, 9, 11, 14, 15 MUTE / STBY NC Mute /stand-by function Not connected FUNCTION DESCRIPTION MUTE STAND-BY FUNCTION The PIN mute/st_by controls the amplifier status by two different thresholds, referred to +Vs. Ø When Vmute/st_by higher than +Vs - 2.5V the amplifier is in Stand-by mode and the final stage generators are off Ø When Vmute/st_by is between +Vs - 2.5V and +Vs- 6V the final stage current generators are switched Ø When Vmute/st_by is lower than +Vs - 6V the amplifier is play mode. on and the amplifier is in mute mode HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.1 2006.05.25 Page 4 of 13 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 54°C/W junction-to-ambient thermal resistance of a HSIP-11 package would cause the die temperature to rise 162°C 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/π2RL+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 8Ω, it can develop up to 23W 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)/23W 4.3°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 2.3°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 lubricated, and about 1.2°C /W if dry. 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 SA7264 and the heat sink. The heat sink thermal resistance must then be less than: 4.3°C/W-2°C/W-1.6°C/W 0.7°C/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 1.3°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 an 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 load. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.1 2006.05.25 Page 5 of 13 SA7264 TYPICAL APPLICATION CIRCUIT SA7264 +Vs C4 1000 F C5 0.1 F 2 +Vs 4 MUTE/ST-BY OUT 2 3 Mute/standby R5 4.7 6 IN2 IN2 C1 1 F SA7264 C8 100nF 7 GND OUT 1 1 8 IN1 IN1 C2 1 F C9 100nF -Vs R6 4.7 5 C6 1000 F C7 0.1 F +Vs C3 1 F R2 15K SW1 B R1 A 10K Mute/standby Q1 R4 15K Dz R3 18K SW1 SW2 A A Stand-by A B Stand-by B B Mute B A Play SW2 A B HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.1 2006.05.25 Page 6 of 13 SA7264 TYPICAL APPLICATION CIRCUIT SA7264B ELECTRICAL CHARACTERISTICS CURVES HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.1 2006.05.25 Page 7 of 13 SA7264 THD vs. Output Power Output Power vs. Operating Voltage 32 10 Vs=±16V RL=3.9 RI=3.9 f=1KHz 28 24 1 16 THD(%) Pout(W) f=15KHz 20 THD=10% 12 f=100Hz 0.1 THD=1% f=1KHz 8 0.01 4 0 4 6 8 10 12 14 16 0.001 0 2 4 18 6 8 10 12 14 16 18 20 22 24 26 Pout (W) Vs(±V) THD vs. Output Power Output Power vs. Operating Voltage 40 10 Vs=±20V RL=8.2 RL=8 F=1KHz 36 32 1 24 20 f=15KHz THD(%) Pout(W) 28 THD=10% 16 0.1 f=100Hz THD=1% 12 f=1KHz 0.01 8 4 0 4 6 8 10 12 14 16 18 20 22 24 26 0.001 0 2 4 6 8 10 12 14 16 18 20 22 24 26 Pout (W) Vs(±V) Attenuation vs. mute/standby Voltage 180 45 160 40 140 Vs=±20V RL=8 x 2 0V=+Vs Vi=0 35 30 25 Attenuation (dB) Quiescent Current (mA) Quiescent Current vs. mute/standby Voltage 50 20 15 100 80 60 10 40 5 20 0 -7 -6 -5 -4 -3 -2 -1 0 Mute/standby(V) HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn F=1KHz Vs=±20V RL=8.2 0dB=1W 0V=+Vs 120 0 -7 -6 -5 -4 -3 -2 -1 0 Mute/standby(V) REV:1.1 2006.05.25 Page 8 of 13 SA7264 PC BOARD AND COMPINENTS LAYOUT OF SA7264 HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.1 2006.05.25 Page 9 of 13 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 RECOMMENDED VALUE PURPOSE R1 10KΩ Mute Circuit R2 15KΩ Mute Circuit R3 18KΩ Mute Circuit R4 15KΩ R5, R6 4.7Ω Mute Circuit Frequency Stability LARGER THAN SMALLER THAN RECOMMENDED VALUE RECOMMENDED VALUE Increase of Dz Biasing Current VMUTE/STBY Shifted Downward VMUTE/STBY Shifted Upward Shifted Upward VMUTE/STBY VMUTE/STBY VMUTE/STBY Shifted Downward Shifted VMUTE/STBY Shifted Upward Downward Danger of Oscillations Danger of Oscillations (To be continued) HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.1 2006.05.25 Page 10 of 13 SA7264 (Continued) COMPONENTS RECOMMENDED PURPOSE VALUE C1, C2 1µF LARGER THAN SMALLER THAN RECOMMENDED VALUE RECOMMENDED VALUE Input DC Higher Low Frequency Decoupling Cutoff St-By/Mute C3 1µF Larger On/Off Time Time Smaller On/Off Time Constant Supply C4, C6 1000µF Danger of Oscillations C5, C7 0.1µF C8, C9 0.1µF Dz 5.1V Mute Circuit Q1 BC107 Mute Circuit Bypass Supply Danger of Oscillations Bypass Frequency Stability PACKAGE OUTLINE HSIP-8 Unit: mm 4.60±0.10 19.90±0.20 1.50±0.03 3.40±0.05 2.54 0.8 0.32 19.95±0.20 HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn 0.51±0.02 2.50±0.08 REV:1.1 2006.05.25 Page 11 of 13 SA7264 PACKAGE OUTLINE HSIP-11 Unit: mm HSIP-15 HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn Unit: mm REV:1.1 2006.05.25 Page 12 of 13