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    TA8227P

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    Tester Test
    This document provides information about the TA8227P audio power IC, including: - It is a two-channel amplifier IC intended for portable cassette players. - It provides 2.5W of output power per channel and has features like thermal shutdown protection. - Electrical characteristics are specified, including a maximum 21mA quiescent current draw. - Application information is provided on adjusting voltage gain, preventing oscillation, and power on/off operation. - Characteristic curves show measurements like total harmonic distortion versus output power.

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    TA8227P

    Uploaded by

    Tester Test
    146 views8 pages
    This document provides information about the TA8227P audio power IC, including: - It is a two-channel amplifier IC intended for portable cassette players. - It provides 2.5W of output power per channel and has features like thermal shutdown protection. - Electrical characteristics are specified, including a maximum 21mA quiescent current draw. - Application information is provided on adjusting voltage gain, preventing oscillation, and power on/off operation. - Characteristic curves show measurements like total harmonic distortion versus output power.

    Original Description:

    Amplifier ic

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    This document provides information about the TA8227P audio power IC, including: - It is a two-channel amplifier IC intended for portable cassette players. - It provides 2.5W of output power per channel and has features like thermal shutdown protection. - Electrical characteristics are specified, including a maximum 21mA quiescent current draw. - Application information is provided on adjusting voltage gain, preventing oscillation, and power on/off operation. - Characteristic curves show measurements like total harmonic distortion versus output power.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    146 views8 pages

    TA8227P

    Uploaded by

    Tester Test
    This document provides information about the TA8227P audio power IC, including: - It is a two-channel amplifier IC intended for portable cassette players. - It provides 2.5W of output power per channel and has features like thermal shutdown protection. - Electrical characteristics are specified, including a maximum 21mA quiescent current draw. - Application information is provided on adjusting voltage gain, preventing oscillation, and power on/off operation. - Characteristic curves show measurements like total harmonic distortion versus output power.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 8

    SUM TA8227P

    LOW FREQUENCY POWER AMPLIFIER TA8227P

    GENERAL DESCRIPTION Outline Drawing TA


    TA8227P is audio power IC wit h built-in
    two Channels developed for portable radio
    TA8227P
    cassette tape recorder with power ON/OFF SUM****
    switch. Thermal shut down protection
    circuit is built in. Because of the parts
    reduction and DIP (Dual in line package),
    space merit is re markable.

    FEATURES
    z High Power
    Pout=2.5W/CH(Typ.) :(Vcc=9V,R L =4 Ω,f=1kHz,THD=10%)
    Pout=3.0W/CH(Typ.) :(Vcc=9V,R L =3 Ω,f=1kHz,THD=10%)
    z Vo ltage Gain : Gv=45dB(Typ.)（ Rf=120Ω ,f=1kHz）
    Gv=56.5dB(Typ.)（ Rf=0 Ω ,f=1kHz
    z Low popping noise at power ON
    z Small Quiescent Current : I C C Q =21 mA(Typ.) (Vcc=9V Vin=0)
    z Ripple Rejection Ratio : R.R.=-52dB(Typ.)(Vc c=9V， fripple=100Hz， Rg=600Ω )
    z Cross Talk : C .T.= -50dB(Typ.)(V cc=9V， f=1kHz， Rg=600 Ω )
    z Output Noise Voltage : Vno=0.3mVrms (Typ.)(Vcc=9V ， Rg=10k Ω ，
    BW=20Hz~20kHz)
    z Stand-By Switch
    z Soft Clip
    z Built-in ther mal shut down protection circuit
    z Best for supply voltage 9V
    z supply voltage range : Vcc=5~12V

    1/8

    SUM
    SUM TA8227P

    MAXIMUM RATINGS (Ta=25°C)


    CHARACT ERISTIC SYMBOL RATING UNIT

    Power Diss ipation* PD 3.0 W


    Operating Te mperature Topr -25~75 °C
    Storage Temperature Tstg -55~150 °C
    * Value for mounting on PC board(Refer to P D -Ta curve)

    ELECTRICAL CHARACTERISTICS
    (Unless otherwise specified , Vcc=9V,f=1kHz, Rg=6 00Ω, R L =4 Ω,Ta=25 °C)

    CHARACT ERISTIC SYMBOL TEST CON DITI ON MIN. TYP. MAX. UNIT
    Quiescent Current ICCQ V I N =0 - 21 45 mA
    POUT(1) THD=10% 2.0 2 .5 -
    Output Power W
    POUT(2) THD=10%, R L =3 Ω - 3.0 -
    Total Harmonic Distortion THD P O U T =0.4W/CH - 0.2 1.0 %
    Rf=120Ω
    GV(1) 43 45 47
    Voltage Gain V O U T =0dBm dB
    GV(2) Rf=0,V O U T =0dBm - 56.5 -
    Input Resistance RIN - - 30 - kΩ
    Rg=10kΩ ,
    Output Noise Vo ltage VNO - 0.3 1.0 mV r m s
    BW=20Hz~20kHz
    Rg=600Ω ,
    Ripple Rejection Ratio R.R - -52 - dB
    fripple =100Hz
    Rg=600Ω ,
    Cross Talk C.T - -50 - dB
    V O U T =0dBm,
    Input Offset Vo ltage V6,V7 - - 30 60 mV
    Stand-By Current Istb SW1-OFF 1 μA

    TYPICAL DC VOLTAGE OF EACH TERMINAL (Vcc=9V, Ta=25°C)

    TERMINAL NO. 1 2 3 4 5 6 7 8 9 10 11 12
    DC VOLTA GE (V) Vcc 4.5 8.7 GND 0.7 0 .03 0 .03 0 .7 5.0 8.7 4.5 Vcc

    2/8

    SUM
    SUM TA8227P

    TEST CIRCUIT & BLOCK DIAGRAM

    *(1) T h i s I C c a n b e u s e d w i t h o u t c o u p l i n g c a p a c i t o r ( C I N ) , I f v o l u m e s l i d e n o i s e o c c u r r e d b y
    i n p u t o ff s e t v o l t a g e i s u n d e s i r a b l e , i t n e e d s t o u s e t h e c a p a c i t o r ( C I N ) .

    * ( 2 ) T h e c o n d e n s e r b e t w e e n t h e ④ p i n a n d t h e G N D ( C 11 ) i s f o r r e d u c i n g p o p n o i s e w h e n t h e

    p o w e r O N / O F F s w i t c h ( S W 1 ) i s s e t t o O N / O F F.

    APPLICATION INFORMATION AND APPLICATION METHOD


    1. ADJUSTMENT OF VOLTAGE GAIN
    The voltage gain Gv is obtained as follows
    by R1,R2 and Rf in Fig.1.
    Gv=20log((Rf+R1+R2)/(Rf+R1))
    When Rf=0 Gv=56.5dB(Typ.)
    When Rf=120Ω Gv=45dB(Typ.)
    By increasing Rf , reduction of Gv is possible ,
    Howev er, sin ce th e feed b ack Fig 1 .
    increase is liable to produce oscillation , it is reco mmended to use this at 40dB or
    over.
    3/8

    SUM
    SUM TA8227P

    2. THERMAL SHUT-DOWN CIRCUIT


    The thermal shut-down circuit is built in for the purpose of preventing the
    destruction of IC due to the abnormal te mp erature rise when the heat radiation is
    insufficient.
    The operation te mp erature is set at radiation Fin temperature 175°C(Typ.)
    At this temp erature or over th e bias is in terrupted to prevent the destruction of IC.
    3. INPUT STAGE
    The input circuit of this IC is as
    shown in Fig.2. PNP TR: Q1 is provided
    in the input circuit so as to make its
    usage possible without the input
    coupling capacitor.
    However , at pins ⑥ and ⑦ , max
    60mV offset voltage is produced.
    Application after checking volu me
    slide noise is recommended.
    For cutting the volume slide noise,
    Insert the input capacitor: C I N in series
    to interrupt the DC component Fig.2
    4. OSCILATION PREVENTIVE MEASURES
    For oscillation preventive capacitor C6 and C7 between th e output ter minal and GND,
    it is recommended to use Polyester fil m c apacitor having good characteristics for
    te mp erature and for high frequency.
    Since the characteristics of the capacitor is liable to be influenced by the
    te mp erature, use th is capacito r after the te mperature test to check the oscillation
    allowance.
    In addition, as the position of the electrolytic capacitor has a re markable influence
    on the oscillation ,connect C10 to Vcc at th e nearest possible position fro m power
    GND.
    At using th is application with th e voltage gain reduced, oscillation is liable to be
    produced. Apply the capacitor after ch ecki ng en ough for its capacity, type and
    mounting position.

    4/8

    SUM
    SUM TA8227P

    As the oscillation allowance varies according to the printed pattern layout, the
    standard printed board is recommended to be referred to des ign it
    5. INPUT VOLTAGE
    When the excessive signal is in put, tu rning-up is produced in th e clip waveform.
    Th e tu rn ing-u p po in t is V I N =300mVr ms(Typ.) : Vcc=9V, R L =4 Ω, f=1kHz : Enough care
    must be taken for this phenomenon.
    6. POWER ON/OFF SWITCH
    There is po wer ON/OFF switch at pin 1. However, output po wer is changed by pin 1
    supply voltage when pin 1 voltage in not same pin 12 supply voltage, after referring
    to attach ed date, select pin 1 supply voltage.
    7. GND LINE
    GND pin is not separated for Pre-GN D a nd for Pw - GND. That is liable to cause
    distortion and cross talk worse. Before use this IC, please check it.

    CHARACTERISTIC CURVES

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    SUM

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