Ordering number : EN8177B Monolithic Linear IC LA4631 For Audio Applications 5W 2-Channel AF Power Amplifier Overview The LA4631 (5W×2 channels) is a single-ended power amplifier that has a pin arrangement similar to the LA4632 BTL power amplifier (10W×2 channels). The LA4631's pin compatibility makes it possible to share a common printed circuit board among a series of end products differentiated by power rank. (Note that the LA4632 is provided in an SIP-12H package, and that it is necessary to provide a hole for the LA4631 pin 13 if the same printed circuit board is to be shared. Note also that certain external components differ.) Functions • 2-channel power amplifier for audio applications Specifications Maximum Ratings at Ta = 25°C Parameter Symbol Conditions Maximum supply voltage VCC max With no input signal Maximum output current IO peak Per channel Allowable power dissipation Pd max With an infinitely large heat sink Maximum junction temperature Tj max Operating temperature Storage temperature Ratings Unit 24 V 2 A 15 W 150 °C Topr -20 to +75 °C Tstg -40 to +150 °C Operating Conditions at Ta = 25°C Parameter Symbol Conditions Ratings Unit Recommended supply voltage VCC 14 V Recommended load resistance range RL op 4 Ω Allowable operating supply voltage range VCC op 5.5 to 22 V *: VCC, RL, and the output level must be set for the size of the heat sink used so that the Pd max range is not exceeded. 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To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer' s products or equipment. 60309 MS/N0508 MS JK/32405TN (OT) No.8177-1/6 LA4631 Electrical Characteristics at Ta = 25°C, VCC = 14V, RL = 4Ω, f = 1kHz, Rg = 600Ω Ratings Parameter Symbol Conditions min typ Standby current Ist VSTB = 0V Quiescent current drain ICCO Rg = 0, VSTB = 5V 18 Standby pin applied voltage Vst The pin 5 voltage such that the amplifier is on 1.5 Output power PO THD = 10% Total harmonic distortion THD VO = 1W Voltage gain VG VO = 0dBm 4 Unit max 1 10 µA 35 80 mA 5 V 5 33 W 0.15 0.4 % 35 37 dB 0.05 0.25 Output noise voltage (rms) VNO Rg = 0, BPF = 20Hz to 20kHz Supply voltage rejection ratio SVRR Rg = 0, fR = 100Hz, VCCR = 0dBm 50 60 Channel separation CHsep Rg = 10kΩ, VO = 0dBm 45 55 Input resistance Ri 20 30 mVrms dB dB 40 kΩ Package Dimensions unit : mm (typ) 3107B Pd max -- Ta Allowable power dissipation, Pd max -- W 16 Aluminum heat sink Tightening torque : 39N•cm With silicone grease applied θjc = 3°C/W 15 With an infinitely large heat sink 100×100×1.5mm3 14 12 11.7 10 8 50×50×1.5mm3 6 5.8 4 2 Without a heat sink 2.0 0 -20 0 20 40 60 80 100 120 140 160 Ambient temperature, Ta -- °C No.8177-2/6 LA4631 Block Diagram Application Circuit Example LA4631 VCC OUT2 NC PWR GND NC OUT1 NC 1 2 3 4 5 6 7 8 9 10 11 12 13 + + RL 4Ω + RL 4Ω + C5 1000µF 25V + VSTB 5V + C6 1000µF 16V P.P C7 1000µF 16V Standby C4 4.7µF 16V IN2 C2 1µF 10V PRE GND C1 1µF 10V IN1 C3 100µF 16V Ripple Filter + Top view VCC No.8177-3/6 LA4631 External Components and Usage Notes C1, C2 : These are input coupling capacitors; we recommend a value of 1µF or lower. The LA4631 input pin potential is about 1.4V, and the polarity must be considered due to the DC potential of the circuits connected to the LA4631 front end. The amplifier's startup time (the time from the point power is first applied until the point an output is generated) will change proportionally with the values of these input capacitors. (When 1µF capacitors are used, the startup time will be about 0.2 seconds.) C3 : This capacitor is used as a ripple filter. We recommend a value of 100µF. Amplifier impulse noise when turned off (when the standby pin goes low) may be made worse if a value under 100µF is used. The pin 1 voltage is about 1/2VCC. A DC mute function can be applied if pin 1 is connected to ground through a 300 to 500Ω resistor. Note that the muting activation voltage will be too low if a resistor value of 750Ω or higher is used. C4 : This is an impulse noise prevention capacitor. The recommended value is 4.7µF. If a value of 2.2µF or lower is used for C4, impulse noise when the amplifier is turned off (when the standby pin goes low) may be made worse. Also, if a value of 10µF or higher is used, an "incomplete muting" phenomenon may occur when the amplifier is turned off (when the standby pin goes low). C5 : Power supply capacitor. This capacitor should be located as close as possible to the IC (to minimize increases in the power supply line impedance) to achieve stable amplifier operation. C6, C7 : Output capacitors. These capacitors influence the amplifiers low band frequency characteristics. (fc = 1/2πCout×RL) fc = low band cutoff frequency, Cout = C6, C7 • Caution Although the LA4631 is basically pin compatible with the LA4632, there are certain differences in the external components and the way the devices are used. (Reference) Pin 5 IC internal equivalent circuit Rx Ix STBY R2 2kΩ 5 R1 2kΩ Standby applied voltage Vx + Ix=max 4.5mA • The amplifier can be turned on or off by controlling the high/low state of pin 5. • The amplifier is turned on by applying a voltage of 1.5V or higher or an influx current of 800µA or higher. (If a 5V level is applied directly to pin 5, the pin 5 influx current will be about 4.5mA.) • If a voltage, Vx, that exceeds 5V will be applied, insert a current limiter resistor (Rx) so that the influx current does not exceed 4.5mA. (See the formula below.) Rx = (Vx – 5V)/4.5mA • When pin 5 is controlled by a microcontroller, to set up a pin 5 influx current (Ix) optimal for the drive capacity of the microcontroller, calculate Rx from the following formula as a first approximation and measure the influx current to verify that level. Rx = (Vx/Ix) – R1 (2kΩ) *: When a voltage is applied to the standby pin (pin 5), refer to the above and insert a resistor (Rx) to limit the influx current if required. No.8177-4/6 LA4631 ICCO -- VCC 70 PO -- VCC 10 RL = 4Ω Rg = 0 Rg = 600Ω fin = 1kHz THD = 10% 9 8 50 40 30 20 7 R L= 4Ω Output power, PO -- W Quiescent current, ICCO -- mA 60 6 5 = RL 8Ω 4 3 2 10 1 0 0 2 4 6 8 10 12 14 16 18 20 22 24 0 26 4 6 8 Total harmonic distortion, THD -- % 2 10 7 5 10 7 3 2 1.0 f = 10kHz 7 5 3 f = 1kHz 2 f = 100Hz 0.1 0.1 2 3 5 7 2 1.0 3 5 7 5 3 Response -- dB -1 16 18 20 22 2 1.0 7 5 3 2 0.1 10 2 3 10 5 7 100 2 3 5 7 1k 2 3 5 7 10k 2 3 5 7 100k 2 3 5 7 100k Frequency, f -- Hz Response -- f PO -- f 6 VCC = 14V RL = 4Ω Rg = 600Ω VO = 0dBm 5 Output power, PO -- W 0 14 VCC = 14V RL = 4Ω Rg = 600Ω PO = 1W Filter : FLAT Output power, PO -- W 1 12 THD -- f THD -- PO VCC = 14V RL = 4Ω Rg = 600Ω Filter : FLAT Total harmonic distortion, THD -- % 3 10 Supply voltage, VCC -- V Supply voltage, VCC -- V -2 -3 -4 -5 VCC = 14V RL = 4Ω Rg = 600Ω THD = 10% THD = 1% 4 3 2 -6 1 -7 -8 10 2 3 5 7 100 2 3 5 7 1k 0 10 2 3 5 7 10k 2 3 5 7 100k 2 2 3 5 7 100 2 3 CHsep -- f 0.3 VCC = 14V RL = 4Ω Rg = 10kΩ DIN AUDIO -40 Output noise voltage, VNO -- mVrms Channel separation, CHsep -- dB -30 -50 CH2 1 CH1 2 -60 -70 10 2 3 5 7 100 2 3 5 7 1k 2 3 Frequency, f -- Hz 5 7 1k 2 3 5 7 10k Frequency, f -- Hz Frequency, f -- Hz 5 7 10k 2 3 5 VNO -- Rg VCC = 14V RL = 4Ω DIN AUDIO 0.2 0.1 0 100 2 3 5 7 1k 2 3 5 7 10k 2 Signal source resistance, Rg -- Ω 3 5 7 100k No.8177-5/6 LA4631 SVRR -- VCC RL = 4Ω Rg = 0 fR = 100Hz VCCR = 0dBm DIN AUDIO -10 -20 -30 -40 -50 -60 -70 0 5 10 15 20 25 VCC = 14V RL = 4Ω Rg = 0 VCCR = 0dBm DIN AUDIO -40 -50 -60 -70 10 2 3 5 7 100 2 3 5 7 1k 2 3 5 7 10k 2 fR -- Hz Supply voltage, VCC -- V SVRR -- VCCR -40 Supply voltage rejection ratio, SVRR -- dB SVRR -- fR -30 Supply voltage rejection ratio, SVRR -- dB Supply voltage rejection ratio, SVRR -- dB 0 VCC = 14V RL = 4Ω Rg = 0 fR = 100Hz DIN AUDIO SVRR = 20log(VO/VCCR) -50 -60 -70 0 0.5 1.0 1.5 2.0 2.5 VCCR -- Vrms SANYO Semiconductor Co.,Ltd. assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein. 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SANYO Semiconductor Co.,Ltd. shall not be liable for any claim or suits with regard to a third party's intellctual property rights which has resulted from the use of the technical information and products mentioned above. This catalog provides information as of June, 2009. Specifications and information herein are subject to change without notice. PS No.8177-6/6