SA7454 2×6W AUDIO POWER AMPLIFIER DESCRIPTION SA7454 is a Class AB dual audio power amplifier. It adopts HSIP-9 or DIP-18IH-300-2.54 package. FEATURES * High output power: 6 + 6W @ THD=10%, RL=4Ω,VCC=14.4V * Fixed gain * Good power supply ripple rejection * Standby and Mute functions * Low ON/OFF POPO noise * Few external components * Short circuit protection * Inverting polarity protection * Thermal protection APPLICATIONS * Multimedia system * LCD-TV ORDERING INFORMATION Device Package SA7454 DIP-18IH-300-2.54 SA7454H HSIP-9 BLOCK DIAGRAM HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn REV:1.0 2008.10.21 Page 1 of 5 SA7454 ABSOLUTE MAXIMUM RATINGS Characteristics Power Supply Symbol Vs Max. Voltage of Inverting Polarity Vs(r) Output Pin Endurance Capability ERGo Output Peak Current Conditions Rating Operating state 18 No signal 20 Vs=0V Iosm No repeat Iorm Repeat Unit V 6 V 200 mJ 4 A 2.5 Total Power Dissipation Ptot 15 W Storage Temperature Tstg -55~+150 °C Operating Ambient Temperature Tamb -40~+85 °C +150 °C Junction Temperature Thermal Resistance from Junction to Case Tj Rth(j-c) SA7454H 8 SA7454 15 °C/W ELECTRICAL CHARACTERISTICS (Unless otherwise specified, Vs=14.4V; RL=4Ω; f=1KHz; Tamb=25°C) Characteristics Power Supply Symbol Test conditions Vs Min. Typ. Max. Unit 8.5 14.4 18.0 V Total Quiescent Current Iq -- 40 80 mA Output DC Level Vo -- 7.00 -- V Output Power Po THD=0.5% 4 4.7 -- THD=10% 5.5 6.0 -- Total Harmonic Distortion Po=1W -- 0.1 -- % Low Cut-Off Frequency flr -3dB -- 45 -- Hz High Cut-Off Frequency fhr -1dB 20 -- -- kHz Closed Loop Gain Gv 19 20 21 dB Operating 48 -- -- Mute 48 -- -- Stand-by 80 -- -- 50 60 75 Supply Voltage Ripple Rejection Ratio Input Resistance Output Noise THD W SVRR Zi Vno Channel Separation CS Channel Balance CB Thermal Protection Tp dB kΩ Operating, Rs=0Ω -- 50 -- Operating, Rs=10Ω -- 70 100 Mute -- 50 -- Rs=0Ω 40 -- -- dB 0.1 1 dB -- μV °C 150 Mute Function Mute/Play Threshold VTMUTE 3.3 -- 6.4 V Vo -- -- 2 mV Stand-By/Mute Threshold VTST-BY 0 -- 2.0 V Stand-By Quiescent Current Iq ST-BY -- 3.0 100 μA Stand-By Bias Current Ib ST-BY -- 15 40 μA Output DC Level When Mute Stand-By Function HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn REV:1.0 2008.10.21 Page 2 of 5 SA7454 PIN CONFIGURATION IN2 MUTE/STBY VCC OUT2 PGND OUT1 SVR SGND IN1 PIN DESCRIPTIONS Pin No. Pin Name I/O Pin Description 1 IN1 I Non inverting input 1 2 SGND -- Signal ground 3 SVR O Supply voltage ripple rejection pin 4 OUT1 O Output 1 5 PGND -- Power ground 6 OUT2 O Output 2 7 VCC -- Power supply 8 MUTE/STBY I Standby and mute pin 9 IN2 I Non inverting input 2 FUNCTION DESCRIPTION Stand-by and mute function The MUTE/STBY controls the amplifier state by different voltages. ¾ When MUTE/STBY is 0 -2V, the amplifier is in standby mode, and the circuit is in power down mode; ¾ When MUTE/STBY is 3.3 -6.4V, the amplifier is in mute mode; ¾ When MUTE/STBY is higher than 8.5V, the amplifier is in operating mode. Power Dissipation and Heat Sinking When the load is a resistor, the maximum average power that SA7454 will be required to dissipate is approximately: 2 2 PD(MAX)=Vs /π RL+PQ Where Vs is the power supply, RL is the load resistance, PQ is the quiescent power dissipation. The above equation is only an approximation which assume SA7454 an “ideal” class B output stage and power dissipation in all other parts of the circuit is constant. As an example, if the SA7454 is operated on a 14.4V power supply with a resistive load of 4Ω, it can develop up to 6W 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 HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn REV:1.0 2008.10.21 Page 3 of 5 SA7454 than: (150°C－50°C)/6W＝16.7°C/W For HSIP-9 package, the die-to-package thermal resistance is Rth(j-c) = 8°C/W，then the package-to-ambient thermal resistance should be lower than 8.7°C/W. So we need heat sink to reduce the package-to-ambient thermal resistance. For DIP-18IH-300-2.54 package, the die-to-package thermal resistance is Rth(j-c) = 15°C/W ， then the package-to-ambient thermal resistance should be lower than 1.7°C/W，that will make heat sinking difficult, in addition, DIP-18IH-300-2.54 can not add effective heat sink, so we need to reduce the power dissipation by reducing load. For example, with a 8Ω load, it can develop up to 3W of internal power dissipation, and the package-to-ambient thermal resistance should be lower than: (150°C－50°C)/3W－15°C/W＝18.3°C /W The thermal requirements can become more difficult when SA7454 is driving a reactive load. 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 equal to the power dissipation with a 4Ω load. TYPICAL APPLICATION CIRCUIT HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn REV:1.0 2008.10.21 Page 4 of 5 SA7454 PACKAGE OUTLINE HSIP-9 Unit: mm DIP-18IH-300-2.54 Unit: mm Note: Silan reserves the right to make changes without notice in this specification for the improvement of the design and performance. Silan will supply the best possible product for customers. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn REV:1.0 2008.10.21 Page 5 of 5