LA4631

Ordering number : EN8177B Monolithic Linear IC LA4631 Overview For Audio Applications 5W 2-Channel AF Power Amplifier 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 Maximum supply voltage Maximum output current Allowable power dissipation Maximum junction temperature Operating temperature Storage temperature Symbol VCC max IO peak Pd max Tj max Topr Tstg With no input signal Per channel With an infinitely large heat sink Conditions Ratings 24 2 15 150 -20 to +75 -40 to +150 Unit V A W °C °C °C Operating Conditions at Ta = 25°C Parameter Recommended supply voltage Recommended load resistance range Allowable operating supply voltage range Symbol VCC RL op VCC op Conditions Ratings 14 4 5.5 to 22 Unit V Ω 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 Standby current Quiescent current drain Standby pin applied voltage Output power Total harmonic distortion Voltage gain Output noise voltage (rms) Supply voltage rejection ratio Channel separation Input resistance Ist ICCO Vst PO THD VG VNO SVRR CHsep Ri Symbol VSTB = 0V Rg = 0, VSTB = 5V The pin 5 voltage such that the amplifier is on THD = 10% VO = 1W VO = 0dBm Rg = 0, BPF = 20Hz to 20kHz Rg = 0, fR = 100Hz, VCCR = 0dBm Rg = 10kΩ, VO = 0dBm 50 45 20 33 18 1.5 4 5 0.15 35 0.05 60 55 30 40 0.4 37 0.25 Conditions min typ 1 35 max 10 80 5 Unit µA mA V W % dB mVrms dB dB kΩ Package Dimensions unit : mm (typ) 3107B 16 Pd max -- Ta Allowable power dissipation, Pd max -- W 15 14 12 11.7 10 8 6 5.8 4 2 2.0 With an infinitely large heat sink 100×100×1.5mm3 Aluminum heat sink Tightening torque : 39N•cm With silicone grease applied θjc = 3°C/W 50×50×1.5mm3 Without a heat sink 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 Ripple Filter 1 C3 100µF 16V C1 1µF 10V IN1 2 PRE GND 3 C2 1µF 10V IN2 4 Standby 5 C4 4.7µF 16V P.P 6 VCC 7 OUT2 8 C7 1000µF 16V NC 9 PWR GND 10 NC 11 OUT1 12 C6 1000µF 16V NC 13 + + + + + + RL 4 Ω VSTB 5V C5 1000µF 25V + Top view VCC RL 4 Ω 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=max 4.5mA Ix 5 Standby applied voltage Vx STBY R2 2kΩ • 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. R1 2kΩ No.8177-4/6 LA4631 70 ICCO -- VCC RL = 4Ω Rg = 0 10 9 8 PO -- VCC Rg = 600Ω fin = 1kHz THD = 10% 60 Quiescent current, ICCO -- mA 50 Output power, PO -- W 7 6 5 4 3 2 R L= 4Ω 40 = RL 8Ω 30 20 10 1 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 0 4 6 8 10 12 14 16 18 20 22 Supply voltage, VCC -- V 3 2 Supply voltage, VCC -- V THD -- PO THD -- f Total harmonic distortion, THD -- % Total harmonic distortion, THD -- % 10 7 5 3 2 1.0 7 5 3 2 VCC = 14V RL = 4 Ω Rg = 600Ω Filter : FLAT 10 7 5 3 2 VCC = 14V RL = 4Ω Rg = 600Ω PO = 1W Filter : FLAT 1.0 7 5 3 2 f = 10kHz f = 1kHz f = 100Hz 2 3 5 7 1.0 2 3 5 7 10 0.1 0.1 0.1 10 23 5 7 100 2 3 5 7 1k 23 5 7 10k 23 5 7 100k Output power, PO -- W 1 0 -1 -2 -3 -4 -5 -6 1 -7 -8 10 0 10 Frequency, f -- Hz 6 Response -- f PO -- f VCC = 14V RL = 4Ω Rg = 600Ω THD = 10% THD = 1% Output power, PO -- W VCC = 14V RL = 4Ω Rg = 600Ω VO = 0dBm 5 Response -- dB 4 3 2 2 3 5 7 100 2 3 5 7 1k 2 3 5 7 10k 2 3 5 7 100k 2 23 5 7 100 2 3 5 7 1k 23 5 7 10k 23 5 7 100k Frequency, f -- Hz -30 Frequency, f -- Hz VCC = 14V RL = 4Ω Rg = 10kΩ DIN AUDIO 0.3 CHsep -- f Output noise voltage, VNO -- mVrms VNO -- Rg VCC = 14V RL = 4Ω DIN AUDIO Channel separation, CHsep -- dB -40 0.2 -50 CH2 1 CH1 2 -60 0.1 -70 10 23 5 7 100 23 5 7 1k 23 5 7 10k 23 5 0 100 2 3 Frequency, f -- Hz Signal source resistance, Rg -- Ω 5 7 1k 2 3 5 7 10k 2 3 5 7 100k No.8177-5/6 LA4631 0 SVRR -- VCC Supply voltage rejection ratio, SVRR -- dB -10 Supply voltage rejection ratio, SVRR -- dB -20 RL = 4Ω Rg = 0 fR = 100Hz VCCR = 0dBm DIN AUDIO -30 SVRR -- fR VCC = 14V RL = 4Ω Rg = 0 VCCR = 0dBm DIN AUDIO -40 -30 -50 -40 -50 -60 -60 -70 0 5 10 15 20 25 -70 10 2 3 5 7 100 2 3 5 7 1k 2 3 5 7 10k 2 Supply voltage, VCC -- V -40 fR -- Hz SVRR -- VCCR Supply voltage rejection ratio, SVRR -- dB -50 VCC = 14V RL = 4Ω Rg = 0 fR = 100Hz DIN AUDIO SVRR = 20log(VO/VCCR) -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