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| SA7265 2-CH AUDIO POWER AMPLIFIER(25W X2) DESCRIPTION The SA7265 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-15 APPLICATIONS * Hi-Fi music centers * Stereo TV sets ORDERING INFORMATION Part No. SA7265 SA7265A Package HSIP-11 HSIP-15 BLOCK DIAGRAM Note: Figures for the SA7265. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.2 2006.05.25 Page 1 of 12 SA7265 ABSOLUTE MAXIMUM RATING Characteristics DC Supply Voltage Output Limited) Power Dissipation Tcase=70C Storage And Junction Temperature Supply Voltage to Guarantee Shortcircuit Protection Thermal Resistance From Junction To Case (Max) normal. Peak Current (Internally Symbol Vs Io Ptot Tstg, Tj Vs(sc) Rth(j-c) Rating 50 or 25 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; Gv=30dB; f=1KHz; Tamb=25C, unless otherwise specified.) Characteristics Supply Range Total Quiescent Current Input Offset Voltage Non Inverting Input Bias Current Music Output Power* Symbol Vs Iq Vos Ib THD=10%; Pomax Vs=22.5V; RL=8; THD=10%; RL=8; Output Power (Continuous RMS) Po Vs=16V; RL=4 THD=1%; 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 (To be continued) Test conditions Min. 5 Typ. 80 Max. 22.5 130 +25 Unit V mA mV nA W -25 500 32 20 25 25 20 20 0.02 0.7 W W W W % % 0.03 1 % % HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.2 2006.05.25 Page 2 of 12 SA7265 (Continued) Characteristics Cross Talk Slew Rate Open Loop Voltage Gain Total Input Noise Input Resistance Supply channel) Thermal 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 Note: Shut-down Junction Voltage Rejection (each Symbol CT SR GV eN Ri SVR Tj Test conditions f=1KHz f=10KHz Min. Typ. 70 60 10 80 Max. Unit dB dB V/s dB V A curve f=20Hz~22KHz 15 Fr=100Hz; Vripple=0.5Vrms 3 4 20 60 145 8 V K dB C VTMUTE AMUTE VTST-BY AST-BY Iq ST-BY -7 60 -3.5 -6 70 -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. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.2 2006.05.25 Page 3 of 12 SA7265 PIN CONFIGURATION PIN DESCRIPTION Pin No. HSIP-11 1 2 3 4 5 6 7 8 9 10 11 HSIP-15 2 3 5 6 7 8 9 10 12 13 14 1,4,11,15 Pin Name -Vs OUT 1 +Vs OUT 2 MUTE / ST-BY -Vs IN+(2) IN-(2) GND IN-(1) IN+(1) NC Negative power Output1 Positive power Output2 Mute /stand-by function Negative power Inverting Input 2 Non inverting input 2 Ground Non inverting input 1 Inverting input 1 Not connected Pin Description FUNCTION DESCRIPTION MUTE AND STAND-BY FUNCTION The pin 5 (MUTE/STAND-BY) controls the amplifier status by two different thresholds, referred to +Vs. - When Vpin5 higher than = +Vs - 2.5V the amplifier is in Stand-by mode and the final stage generators are off - When Vpin5 is between +Vs - 2.5V and +Vs- 6V the final stage current generators are switched on and the amplifier is in mute mode - When Vpin5 is lower than +Vs - 6V the amplifier is play mode. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.2 2006.05.25 Page 4 of 12 SA7265 BRIDGE APPLICATION Another application suggestion concerns the BRIDGE configuration, where the two power amplifiers are connected as shown by the schematic diagram of the following. This application shows, however, some operative limits due to dissipation and current capability of the output stage. For this reason, we recommend to use the SA7265 in bridge with the supply voltage equal/lower than 16V when the load is 8; with higher loads (i.e.16), the amplifier can work correctly in the whole supply voltage range. With R1=8, Vs=16V the maximum output power obtainable is 50W at TDH=10%. The quiescent current remains unchanged with respect to the stereo configuration (~80mA as typical at Vs=16V). The last point to take into consideration concerns the short-circuit protection. As for the stereo application, the SA7265 is fully protected against any kind of short-circuit (between Out/Gnd, Out/+Vs and Out/-Vs). Power Dissipation and Heat Sinking The SA7265 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 SA7265 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 SA7265 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 SA7265, 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 SA7265 with various power supply voltages and resistive loads. As an example, if the SA7265 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 SA7265 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 HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.2 2006.05.25 Page 5 of 12 SA7265 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. TYPICAL APPLICATION CIRCUIT IN SPLIT SUPPLY Note: Figures for the SA7265. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.2 2006.05.25 Page 6 of 12 SA7265 TYPICAL APPLICATION CIRCUIT IN SINGLE SUPPLY Note: Figures for the SA7265. TYPICAL BRIDGE APPLICATION CIRCUIT IN SPLIT SUPPLY Note: Figures for the SA7265. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.2 2006.05.25 Page 7 of 12 SA7265 ELECTRICAL CHARACTERISTICS CURVES Pout(W) Pout(W) THD(%) THD(%) Ampl.(dB) Iq(mA) (To be continued) HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.2 2006.05.25 Page 8 of 12 SA7265 (Continued) Pdlss(W) Attenuation (dB) Pdlss(W) PC BOARD AND COMPINENTS LAYOUT OF THE TYPICAL APPLICATION IN SPLIT SUPPLY HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn Iq(mA) REV:1.2 2006.05.25 Page 9 of 12 SA7265 APPLICATION SUGGEST The recommended values of the external components are those shown are the Typical Application Circuit in Split Supply: COMPONENTS R1 R2 R3 R4 R5, R8 R6, R9 R7 R10 C1, C2 RECOMMENDED VALUE 10K 15K 18K 15K 18K 560 4.7 1F PURPOSE Mute Circuit Mute Circuit Mute Circuit Mute Circuit Closed Loop Gain Setting* Frequency Stability Input DC Decoupling St-By/Mute C3 1F Time Constant C4, C6 C5, C7 C8, C9 Dz Q1 1000F 0.1F 0.1F 5.1V BC107 25dB Supply Bypass Supply Bypass Frequency Stability Mute Circuit Mute Circuit Danger of Oscillations Danger of Oscillations Larger On/Off Time Smaller On/Off Time LARGER THAN RECOMMENDED VALUE Increase of Dz Biasing Current VMUTE/STBY Downward VMUTE/STBY Upward VMUTE/STBY Upward Increase of Gain Decrease of Gain Danger of Oscillations Danger of Oscillations Higher Low Frequency Cutoff Shifted Shifted Shifted VMUTE/STBY Upward VMUTE/STBY Downward VMUTE/STBY Downward Shifted Shifted Shifted SMALLER THAN RECOMMENDED VALUE * Closed loop gain has to be HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.2 2006.05.25 Page 10 of 12 SA7265 PACKAGE OUTLINE HSIP-11 Unit: mm HSIP-15 Unit: mm HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.2 2006.05.25 Page 11 of 12 |
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