UNISONIC TECHNOLOGIES CO.,

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1 LM UNISONIC TECHNOLOGIES CO., LOW VOLTAGE AUDIO POWER AMPLIFIER DESCRIPTION SOP The UTC LM is a power amplifier, designed for use in low voltage consumer applications. The gain is internally set to to keep external part count low, but the addition of an external resistor and capacitor between pin and pin will increase the gain to any value up from to. The inputs are ground referenced while the output automatically biases to onehalf the supply voltage.the quiescent power drain is only milliwatts when operating from a voltage supply, making the LM ideal for battery operation. FEATURES TSSOP DIP *Pbfree plating product number:lml *Battery operation *Minimum external parts *Wide supply voltage range: V~V *Low quiescent current drain:ma *Voltage gains:~ *Ground referenced input *Selfcentering output quiescent voltage *Low distortion:.%(av =,=V,RL=Ω,Po=mW,f=kHz) ORDERING INFORMATION Order Number Normal Lead Free Plating Package Packing LMSR LMLSR SOP Tape Reel LMST LMLST SOP Tube LMPR LMLPR TSSOP Tape Reel LMPT LMLPT TSSOP Tube LMDT LMLDT DIP Tube Copyright Unisonic Technologies Co., QWR,F

2 LM PIN CONFIGURATION Gain Gain Input Bypass Input UTC LM VCC GND Output BLOCK DIAGRAM K K GAIN GAIN K.K INPUT INPUT VOUT K K GND UNISONIC TECHNOLOGIES CO., LTD QWR. F

3 LM ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL RATINGS UNIT Supply Voltage V CC V Input Voltage V IN.V ~.V V DIP Power Dissipation SOP P D mw TSSOP Operating Temperature T OPR ~ C Junction Temperature T J C Storage Temperature T STG ~ C Note:. Absolute maximum ratings are stress ratings only and functional device operation is not implied. The device could be damaged beyond Absolute maximum ratings.. The device is guaranteed to meet performance specifications within ~ operating temperature range and assured by design from ~. ELECTRICAL CHARACTERISTICS (Ta= C, unless otherwise specified.) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Operating Supply Voltage s V Quiescent Current I Q s=v, V IN = ma Output Power Voltage Gain P OUT G V s=v, R L =Ω, =% s=9v, R L =Ω, =% s=v, f=khz µf from pin to pin Bandwidth BW s=v, Pin and pin open khz Total Harmonic Distortion P OUT =mw, =V,f=kHz R L =Ω pin and pin open. % Rejection Ratio RR s=v, f=khz, C =µf pinand pin open, Referred to db output Input Resistance R IN kω Input Bias Current I BIAS s=v Pin and pin open na mw mw db db UNISONIC TECHNOLOGIES CO., LTD QWR. F

4 LM APPLICATION NOTES GAIN CONTROL To make the LM a more versatile amplifier, two pins(and ) are provided for gain control. With pins and open the. kω resistor sets the gain at (db),if a capacitor is put from pin to,bypassing the. kω resistor, the gain will go up to (db).if a resistor is placed in series with the capacitor, the gain can be set to any value from to.gain control can also be done by capacitively coupling a resistor (or FET) from pin to ground. Additional external components can be placed in parallel with the internal feedback resistors to tailor the gain and frequency 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 to (paralleling the internal kω resistor). For db effective bass boost: R= kω, the lowest value for good stable operation is R= kω, if pin is open, If pins and are bypassed then R as low as kω can be used. This restriction is because the amplifier is only compensated for closedloop gains greater than 9. INPUT BIASING The schematic shows that both inputs are biased to ground with a kω resistor. The base current of the input transistors is about na, so the inputs are at about.mw when left open. If the dc source resistance driving the LM is higher than kω it will contribute very little additional offset (about.mw at the input, mw at the output).if the dc source resistance is less than kω,then shorting the unused input to ground will keep the offset low (about.mv at the input, mv 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 LM with higher gains (bypassing the. kω resistor between pins and )it is necessary to bypass the unused input, preventing degradation of gain and possible instabilities. This is done with a.µf capacitor or a short to ground depending on the dc source resistance on the driven input. TYPICAL APPLICATIONS CIRCUIT Amplifier with Gain= Minimum Parts Amplifier with Gain= µf VIN K µf.µf VIN K µf.µf Amplifier with Gain= Low Distortion Power Wienbridge Oscillator 9 VIN K.K µf µf.µf ELDEMA CFS VmA f=khz µf.µf K µf.µf RL Vo.K.µF UNISONIC TECHNOLOGIES CO., LTD QWR. F

5 LM TYPICAL APPLICATIONS CIRCUIT(cont.) Amplifier with Bass Boost Square Ware Oscillator K.µF K µf.µf Ω RL VO.µF K f=khz K µf K RL VO AM Radio Power Amplifier FROM DETECTOR Cc VOL K R K.µ F C pf µ F FERRITE BEAD µ F µ F.µ F Ω SPEAKER Note : Twist Supply lead and supply ground very tightly. Note : Twist speaker lead and ground very tightly. Note : Ferrite bead in Ferroxcube K/B with turns of wire. Note : RC band limits input signals. Note : All components must be spaced very closely to IC. UNISONIC TECHNOLOGIES CO., LTD QWR. F

6 LM TYPICAL CHARACTERISTICS Supply Current (ma) Quiescent Supply Current vs Supply Voltage Power Supply Rejection (db) Power Supply Rejection Ratio(Referred to the Output) vs Frequency C=µF µf µf =V Av=dB.µF NO CAPACITOR 9 Supply Voltage(volts) K K K Output Voltage (Volts PeakToPeak) Peakto Peak Output Voltage Swing vs Supply Voltage RL= 9 Supply Voltage(volts) Voltage Gain (db) 9 Frequency Response With Bass Boost K K K K K Voltage Gain (db) Voltage Gain vs Frequency C.=µF C.= K K K M Total Harmonic Distortion (%) Distortion vs Frequency =V RL=Ω POUT=mW Av=dB(C.=). K K K KK UNISONIC TECHNOLOGIES CO., LTD QWR. F

7 LM TYPICAL CHARACTERISTICS(cont.) Total Harmonic Distortion (%) 9 =V RL=Ω f=khz Distortion vs Output Power.... Power Output (Watts) Device Dissipation (W) Device Dissipaton vs Output Power ΩLoad =V =V =9V.... Output Power (W) % %. Device Dissipation (W).... Device Dissipaton vs Output Power ΩLoad =V %... =V. =9V.. % =V Device Dissipation (W).... Device Dissipaton vs Output Power ΩLoad =V =V. =9V =V.... % % Output Power (W) Output Power (W) UTC 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 UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. UNISONIC TECHNOLOGIES CO., LTD QWR. F

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