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| om .c 4Udesigned for use in low is a power amplifier et T he PJ386consumer applications. The gain is internally set voltage he to 20 to keep external part count low, but the addition of an external resistor andS a capacitor between pins 1 and 8 will increase the gain to any value up to 200. at .D FEATURES w * Battery operation w external parts * wMinimum * Wide supply voltage range 4-12 Volt * * * * * * Low quiescent current drain 4mA Voltage gains from 20 to 200 Ground referenced input self-centering output quiescent voltage Low distortion Eight pin dual-in-line package PJ386 Low Voltage Audio Power Amplifier The inputs are ground referenced while the output is automatically biased to one half the supply voltage.The quiescent power drain is only 24 milliwatts when operating from a 6 volt supply,making the PJ386 ideal for battery operation. DIP-8 SOP-8 APPLICATIONS * * * * * * * * AM-FM radio amplifiers Portable tape player amplifiers Intercoms TV sound systems Line drivers Ultrasonic drivers Small servo drivers Power converters EQUIVALENT CIRCUIT m o .c U t4 e e h S ta a .D w w w Pin : 1. Gain 2. -Input 3. +Input 4. Gnd 5. Output 6. V+ 7. Bypass 8. Gain ORDERING INFORMATION Device Operating Temperature Package PJ386CD PJ386CS -20 oC TO +85 oC DIP-8 SOP-8 om .c 4U et he aS at .D w w w 2003/10.ver.A 1-6 PJ386 Low Voltage Audio Power Amplifier ABSOLUTE MAXIMUM RATINGS (TA=25) Characteristic Supply Voltage Power Dissipation DIP-8 SOP-8 Symbol V+ PD Vin Topr Tstg Value 15 700 300 0.4 -20 ~ +85 -40 ~ +125 Unit V mW V C o C o Input Voltage Range Operating Temperature Range Storage Temperature Range ELECTRICAL CHARACTERISTICS (TA=25) Parameter Quiescent Circuit Current(IQ) Output Power (POUT ) Voltage Gain (Av) D-Type Bandwidth (BW) D-Type Total Harmonic Distortion(THD) (D-Type) Power Supply Rejection Ratio (PSRR) Input Resistance (RIN) Input Bias Current (IBIAS) Conditions VIN =0 Vs =6V , RL=8,THD=10% Vs= 9V , RL=8,THD=10% Vs=6V,f=1KHz 10F from Pin 1 to 8 VS =6V, Pins 1 and 8 Open 10F from Pin 1 to 8 VS =6V, RL=8,POUT=125mW f=1KHz, Pins 1 and 8 open VS=6V,f=1KHz, CBY PASS=10F Pins 1 and 8 Open, Referred to Output VS =6V,Pins 2 and 3 Open Min. 250 500 Typ. 4 325 700 26 46 300 60 0.2 50 50 250 Max. 8 Units mA mW mW dB dB KHz % dB K nA (note 1) Set the maximum junction temperature to 125 and reduce the thermal resistance to 143/W when the ambient temperature is high. (note 2) Insert a 10resistor and 0.05F capacitor in series to ground terminal from pin 5. TYPICAL APPLICATION PJ386 PJ386 2-6 2003/10.ver.A PJ386 Low Voltage Audio Power Amplifier Amplifier with Bass Boost TYPICAL CHARACTERISTICS (Ta=25) Low Distortion Power Wienbrige Oscillator Amplifier 2 Square Wave Oscillator APPLICATION HINTS GAIN CONTROL To make the PJ386 a more versatile amplifier, two pins ( 1 and 8 ) are provided for gain control. With pins 1 to 8 open the 1.35K resistor sets the gain at 20 (26dB). If a capacitor is put from pin 1 to 8,bypassing the 1.35 K resistor, the gain will go up to 200 (46 dB). If a resistor is placed in series with the capacitor, the gain can be set to any value from 20 to 200.Gain control can also be done by capacitively coupling a resistor (or FET ) from pin 1 to ground. Additional external components can be placed in parallel with the internal feedback resistors to tailor the gain and frequen-cy response for individual applications. For example, we can compensate poor speaker bass response by frequency shaping the feedback path. This is done with a series RC from pin 1 to 5 (paralleling the internal 15 K resistor). For 6 dB effective bass boost: R15 K ,the lowest values for good stable operation is Rmin=10 K if pin 8 is open.If pins 1 and 8 are bypassed then R as low 2 K can be used. This restriciton is because the amplifier is only compensated for closed-loop gains greater than 9. INPUT BIASING The schematic shows that both inputs are biased to ground with a 50 K resistor. The base current of the input transistors is about 250nA , so the inputs are at about 12.5mV when left open. If the dc source resistance driving the PJ386 is higher than 250 K it will contribute very little additional offset (about 2.5mV at the input, 50mV at the output ).If the dc source resistance is less than 10 K , then shorting the unused input to ground will keep the offset low (about 2.5mV at the input , 50mV at the output).For dc source resistances between these values we can eliminate excess offset by putting a resistor from the unused input to ground, equal in value to the dc source resistance. Of course all offset problems are eliminated if the input is capacitively coupled. When using the PJ386 will higher gains (bypassing the 1.35 K resistor between pins 1 and 8) it is necessary to bypass the unused input , preventing degradation of gain and possible instabilities. This is done with a 0.1F capacitor or a short to ground depending on the dc source resistance on the driven input. 3-6 2003/10.ver.A PJ386 Low Voltage Audio Power Amplifier Quiescent Current vs. Supply Voltage Maximum Output Voltage Swing vs. Supply Voltage Voltage Gain vs. Frequency Power Supply Rejection Ratio vs. Frequency (V+=6V,Av=26dB) Total Harmonic Distortion vs. Frequency (V+ =6V, RL=8, Po=125mW,Av=26dB) Total Harmonic Distortion vs. Output Power (V+ =6V, RL=8, f=1KHz) 4-6 2003/10.ver.A PJ386 Low Voltage Audio Power Amplifier Power Dissipation vs. Output Power(RL=4) Power Dissipation vs. Output Power(RL=8) Power Dissipation vs. Output Power(RL=16) Frequency Response with Base Boost Power Dissipation vs. AmbientTemperature 5-6 2003/10.ver.A PJ386 Low Voltage Audio Power Amplifier DIM A B C D G J K L M MILLIMETERS MIN MAX 9.07 9.32 6.22 6.48 3.18 4.43 0.35 0.55 2.54BSC 0.29 0.31 3.25 3.35 7.75 8.00 10 INCHES MIN MAX 0.357 0.367 0.245 0.255 0.125 0.135 0.019 0.020 0.10BSC 0.011 0.012 0.128 0.132 0.305 0.315 10 DIM A B C D F G K M P R MILLIMETERS MIN MAX 4.80 5.00 3.80 4.00 1.35 1.75 0.35 0.49 0.40 1.25 1.27BSC 0.10 0.25 0 7 5.80 6.20 0.25 0.50 INCHES MIN MAX 0.189 0.196 0.150 0.157 0.054 0.068 0.014 0.019 0.016 0.049 0.05BSC 0.004 0.009 0 7 0.229 0.244 0.010 0.019 6-6 2003/10.ver.A |
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