TA7K UNISONIC TECHNOLOGIES CO., LTD LOW FREQUENCY POWER AMPLIFIER DESCRIPTION The UTC TA7K is an audio power IC with built-in two channels and thermal shut down protection circuit. The IC is developed for portable radio cassette tape recorder with power ON/OFF switch. FEATURES *High Power : P OUT =.W / CH (Typ.) (V CC =9V, R L =Ω, f=khz, THD=%) : P OUT =.W / CH (Typ.) (V CC =V, R L =Ω, f=khz, THD=%) *Low Popping Noise at Power ON *Small Quiescent Current: ICCQ=mA (Typ.) (V CC =9V, V IN =) *Soft Clip *Built-in Thermal Shut Down Protection Circuit *Bast for Supply Voltage 9V, V *Operation Supply Voltage Range: V CC =-V ORDERING INFORMATION FSIP-H *Pb-free plating product number: TA7KL Order Number Package Packing Normal Lead Free Plating TA7K-F-T TA7KL-F-T FSIP-H Tube TA7KL-F-T ()Packing Type ()Package Type ()Lead Plating () T: Tube () F: FSIP-H () L: Lead Free Plating, Blank: Pb/Sn of 9 Copyright Unisonic Technologies Co., Ltd QW-R7-,C
TA7K ABSOLUTE MAXIMUM RATINGS (Ta= C) PARAMETER SYMBOL VALUE UNIT Supply Voltage V CC V Output Current (Peak / CH) I O(PEAK). A Power Dissipation P D. W Operating Temperature T OPR - to + 7 C Storage Temperature T STG - to + C ELECTRICAL CHARACTERISTICS (V CC =9V, R L =Ω, Rg=Ω, f=khz, Ta= C, unless otherwise specified) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Quiescent Current I CCQ V IN = ma Output Power P OUT() THD=%.. W P OUT() V CC =V,THD=%. W Total Harmonic Distortion THD P OUT =.W / ch.. % Output Noise Voltage en Rg=kΩ BW=Hz ~ khz.. mvrms Input Resistance R IN kω Rf=Ω G V () Voltage Gain V OUT =.77Vrms 7 db G V () Rf=, V OUT =.77Vrms. db Ripple Rejection Ratio RR Rg=Ω Fripple=Hz db Cross Talk CT Rg=Ω, Amp<-> V OUT =dbm, f=khz db Input Offset Voltage V,V7 mv Stand-by Current ISTDBY SW->OFF µa TYPICAL DC VOLTAGE OF EACH TERMINAL (V CC =9V, Ta= C) TERMINAL NO. 7 9 DC Voltage.7. V CC..7...7 GND..7 V CC UNISONIC TECHNOLOGIES CO., LTD of 9 QW-R7-,C
TA7K TEST CIRCUIT * C μf V CC SW C μf V CC IN - * C μf C IN R Ω IN Ω NF + ch - - kω B.S. C μf C μf C.μF OUT - R L C 7μF RIPPLE BIAS CIRCUIT THE RMAL SHUT DOWN PROTECTION CIRCUIT IN - * C 7μF C IN R Ω IN 7 Ω NF + - ch - C μf B.S. C9 μf C7.μF R L OUT - kω 9 GND REMARK:.This IC can be used without coupling capacitor (C IN ). If volume slide noise occurred by input offset voltage is undesirable, it needs to use the capacitor (C IN )..The condenser between the pin and the GND (C) is for reducing pop noise when the power ON/OFF switch (SW) is set to ON/OFF. UNISONIC TECHNOLOGIES CO., LTD of 9 QW-R7-,C
TA7K APPLICATION INFORMATION. ADJUSTMENT OF VOLTAGE GAIN The voltage gain G V is obtained as follows by R,R and Rf in Fig.. INPUT CNF - + 7 μ F Rf /7 / R Ω + AMP - R kω / OUTPUT Rf+R+R Gv=λog Rf+R When Rf=Ω Gv=.dB(typ.) When Rf=Ω Gv=dB(typ.) Reduction of Gv is possible by increasing Rf. However, it is recommended to use this at db or over since the feedback increase is liable to produce oscillation.. THERMAL SHUTDOWN CIRCUIT The built-in thermal shut-down circuit can prevent the destruction of IC that abnormal temperature rise when the heat radiation is insufficient. The operation temperature is set at radiation fin temperature 7, at this temperature or over the bias is interrupted to prevent the destruction of IC.. INPUT STAGE Below circuit shows the input circuit of this IC. OUTPUT Q Q KΩ / - + CIN INPUT /7 9 GND KΩ Q Ω NF / to DRIVER to BIAS - + Rf 7μF It is possible that without input coupling capacitor in the input circuit by use a PNP Transistor,Q. However, mv max offset voltage is produced at pin () and (7). Application after checking volume slide noise is recommended. In order to cut the volume slide noise, insert the input capacitor(c IN) in series to interrupt the DC component. UNISONIC TECHNOLOGIES CO., LTD of 9 QW-R7-,C
TA7K APPLICATION INFORMATION(Cont.). OSCILLATION PREVENTIVE MEASURES For oscillation preventive capacitor C and C7 between the output terminal and GND, polyester film capacitor is recommended due to good characteristics for temperature and for high frequency. it is better that use this capacitor after the temperature test to check the oscillation allowance due to the characteristics of the capacitor is liable to be influenced by the temperature.besides, as the position of the electrolytic capacitor has remarkable influence on the oscillation, connect C to V CC as close power GND as possible. At using this application with the voltage gain reduced, oscillation is liable to be produced. Apply the capacitor after checking enough for its capacity, type and mounting position.. POWER ON/OFF SWITCH There is power on/off switch at () pin. However, output power is changed by () pin supply voltage when() pin supply voltage I not same() pin supply voltage, after referring to attached date, select() pin supply voltage.. INPUT VOLTAGE When the excessive signal is input, turning-up is produced in the clip waveform. The turning-up point is VIN=mVrms (typ.): V CC =9V, R L =Ω, f=khz: Enough care must be taken for this phenomenon. 7. GND LINE GND pin is not separated for pre-gnd and for PW-GND. That is liable to cause distortion and cross talk worse. UNISONIC TECHNOLOGIES CO., LTD of 9 QW-R7-,C
TA7K TYPICAL CHARACTERISTICS Quiescent Current, ICCQ (ma) VIN= Ta= ICCQ,V,V-VCC Voltage Gain, G V (db) 7 Gv-f RNF=Ω Ta= K K K K K Supply Voltage, Vcc (V) Frequency, f (Hz) Total Harmoic Distortion, THD (%). RNF=Ω Ta= f=khz Hz. khz..... Output Power, P OUT (W) Total Harmoic Distortion, THD (%).... VCC=V RNF=Ω Ta=. f=khz Hz khz.. Output Power, P OUT (W) Total Harmoic Distortion, THD (%).... f=khz RNF=Ω Ta=. VCC=V 9.. Output Power, P OUT (W) Ripple Rejection Ration, R.R.(d B) - - - - - - -7 - R.R.-f RNF=Ω Rg=Ω K K K Frequency, f (Hz) K UNISONIC TECHNOLOGIES CO., LTD of 9 QW-R7-,C
TA7K TYPICAL CHARACTERISTICS (Cont.) Ripple Rejection Ratio R.R.(d B) - - - - - - -7 R.R. - Rg f=khz RNF=Ω Ta= Cross Talk C.T. (d B) - - - - - - -7 C.T. - f Rg=Ω RNF=Ω - K K K K K Signal Source Resistance, Rg (Ω) - K K K K K Frequency, f (Hz) Cross Talk C.T. (d B) - - - - - - -7 - f=khz RNF=Ω Ta= C.T. - Rg K K K K K Output Noise Voltage, en (mvrms)........ RNF=Ω BW=~kHz Ta= en - Rg K K K K K Signal Source Resistance, Rg (Ω) Signal Source Resistance, Rg (Ω) ICCQ,V,V-VCC Quiescent Current, ICCQ (ma) ICCQ V,V Supply Voltage, Vcc (V) Output Voltage V,V (V) Total Harmoic Distortion THD (%).... f=khz RNF=Ω Ta=.. VCC=V 7 9. Output Power, P OUT (W) UNISONIC TECHNOLOGIES CO., LTD 7 of 9 QW-R7-,C
TA7K TYPICAL CHARACTERISTICS (Cont.) Total Harmonic Distortion, THD (%)..... THD - Ta - - Ambient Temperature, Ta( ) POUT=.W f=khz Quiescent Current, ICCQ (ma) V,V ICCQ,V,V - Ta ICCQ - - Ambient Temperature, Ta( ) VIN= Output Voltage V,V (V) Allowable Power Dissipation, PD (W) () () () () PD -Ta () INFNITE HEAT SINK () cm mm AL HEAT SINK () cm mm AL HEAT SINK () NO HEAT SINK Ambient Temperature, Ta ( ) Power Dissipation, PD (W) VCC=V 9 PD -POUT f=khz 7 Output Voltage, POUT (W) ICCQ,V,V-VCC Quiescent Current, ICCQ (ma) ICCQ V,V Output Voltage, V,V (V) Total Harmoic Distortion, THD(%).. f=khz RNF=Ω Ta= VCC=V 7 9 Supply Voltage, Vcc (V)..... Output Power, POUT (W) UNISONIC TECHNOLOGIES CO., LTD of 9 QW-R7-,C
TA7K TYPICAL CHARACTERISTICS (Cont.) THD - Ta ICCQ,V,V - Ta Total Harmonic Distortion, THD (%)..... - - Ambient Temperature, Ta( ) POUT=.W f=khz Quiescent Current, ICCQ (ma) V,V ICCQ - - Ambient Temperature, Ta( ) VIN= Output Voltage, V,V (V) Allowable Power Dissipation, PD(W) () () () () PD -Ta () INFNITE HEAT SINK () cm mm AL HEAT SINK () cm mm AL HEAT SINK () NO HEAT SINK Ambient Temperature, Ta ( ) Power Dissipation, PD(W) VCC=V 9 PD -POUT f=khz 7 Output Voltage, POUT (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 9 of 9 QW-R7-,C