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 REV:1.1 2006.05.25 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) HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.1 2006.05.25 Page 2 of 11 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) HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.1 2006.05.25 Page 3 of 11 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 HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn 0.5°C/W REV:1.1 2006.05.25 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 Http: www.silan.com.cn REV:1.1 2006.05.25 Page 5 of 11 SA7267 TYPICAL APPLICATION CIRCUIT IN SINGLE SUPPLY Note: Figures for the SA7267. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.1 2006.05.25 Page 6 of 11 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) HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.1 2006.05.25 Page 7 of 11 SA7267 Power dissipation (W) Power dissipation (W) (Continued) PC BOARD AND COMPINENTS LAYOUT OF THE TYPICAL APPLICATION IN SPLIT SUPPLY HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.1 2006.05.25 Page 8 of 11 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. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn Shifted REV:1.1 2006.05.25 Page 9 of 11 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 Http: www.silan.com.cn REV:1.1 2006.05.25 Page 10 of 11