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TA8248K
TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic
TA8248K
Low Frequency Power Amplifier
TA8248K is an audio power IC with built-in two channels developed for portable radio cassette tape recorder with power ON/OFF switch. Because of the parts reduction and SIP (Single Inline Package), space merit is remarkable. Thermal shut down protection circuit is built in.
Features
* High Power : Pout (1) = 2.5 W (typ.) (VCC = 9 V, RL = 4, f = 1 kHz, THD = 10%) : Pout (2) = 4.6 W (typ.) (VCC = 12 V, RL = 4, f = 1 kHz, THD = 10%) * * * * * * Low Popping Noise at Power ON Small Quiescent Current : ICCQ = 21 mA (typ.) (VCC = 15 V, Vin = 0) Soft Clip Built-in Thermal Shut Down Protection Circuit Best for Supply Voltage 9 V, 12 V Operation Supply Voltage Range : VCC (opr) = 6~15 V (Ta = 25C) Weight: 3.9 g (typ.)
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Block Diagram
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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 = 20 log R f + R1 + R2 R f + R1
When Rf = 0 , When Rf = 120 ,
Gv = 56.5dB (typ.) Gv = 45dB (typ.)
Figure 1
By increasing Rf, reduction of Gv is possible. However, since the feedback increase is liable to produce oscillation, it is recommended to use this at 40dB or over.
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 temperature rise when the heat radiation is insufficient. The operation temperature is set at radiation Fin temperature 175C (typ.). At this temperature or over the bias is interrupted 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 pin11 and 12, max 60 mV offset voltage is produced. Application after checking volume slide noise is recommended. For cutting the volume slide noise, insert the input capacitor : CIN in series to interrupt the DC component.
Figure 2
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4. Oscillation preventive measures
For oscillation preventive capacitor C6 and C7 between the output terminal and GND, it is recommended to use polyester film capacitor having good characteristics for temperature and for high frequency. Since the characteristics of the capacitor is liable to be influenced by the temperature, use this capacitor after the temperature test to check the oscillation allowance. In addition, as the position of the electrolytic capacitor has a remarkable influence on the oscillation, connect C10 to VCC at the nearest possible position from power GND. 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. Note 1: As the oscillation allowance varies according to the printed pattern layout, the standard printed board of TOSHIBA is recommended to be referred to design it.
5. Power ON/OFF switch
There is power ON/OFF switch at pin8. However, output power is changed by pin8 supply voltage when pin8 supply voltage is not same pin4 supply voltage, after referring to attached date, select pin8 supply voltage.
6. Input voltage
When the excessive signal is input, turning-up is produced in the clip waveform. The turning-up point is Vin = 300 mVrms (typ.) : VCC = 9 V, RL = 4 , f = 1 kHz : Enough care must be taken for this phenomenon.
Maximum Ratings (Ta = 25C)
Characteristics Supply voltage Output current (peak/CH) Power dissipation Operating temperature Storage temperature Symbol VCC IO (peak) PD (Note 2) Topr Tstg Rating 20 2.5 15.0 -20~75 -55~150 Unit V A W C C
Note 2: Derated above Ta = 25C in the proportion of 120 mW/C.
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Electrical Characteristics
Characteristics Quiescent current Output power Total harmonic distortion
(unless otherwise specified, VCC = 9 V, RL = 4 , Rg = 600 , f = 1 kHz, Ta = 25C, Rf = 120 )
Symbol ICCQ Pout (1) Pout (2) THD Gv (1) Voltage gain Gv (2) Input resistance Output noise voltage Ripple rejection ratio Cross talk Input offset voltage Stand-by current RIN Vno R.R. C.T. V11, V12 IOFF SW1 OFF Rg = 10 k, BW = 20 Hz~20 kHz Rg = 600 , fripple = 100 kHz Rg = 600 , amp1 2, Vout = 0.775 Vrms (0dBm) Test Circuit Vin = 0 THD = 10% THD = 10%, VCC = 12 V Pout = 0.4 W/ch Rf = 120 , Vout = 0.775 Vrms (0dBm) Rf = 0, Vout = 0.775 Vrms (0dBm) Test Condition Min 2.0 43 Typ. 21 2.5 4.6 0.2 45 56.5 30 0.3 -52 -50 30 1 Max 45 1.0 47 dB 1.0 60 k mVrms dB dB mV A Unit mA W %
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Test Circuit
*1: *2:
This IC can be used without coupling capacitor (CIN). If volume slide noise occurred by input offset voltage is undesirable, it needs to use the capacitor (CIN). The condenser between the pin 8 and the GND (C11) is for reducing POP noise when the power ON/OFF switch (SW1) is set to ON/OFF.
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Package Dimensions
Weight: 3.9 g (typ.)
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RESTRICTIONS ON PRODUCT USE
000707EBA
* TOSHIBA is continually working to improve the quality and reliability of its products. Nevertheless, semiconductor devices in general can malfunction or fail due to their inherent electrical sensitivity and vulnerability to physical stress. It is the responsibility of the buyer, when utilizing TOSHIBA products, to comply with the standards of safety in making a safe design for the entire system, and to avoid situations in which a malfunction or failure of such TOSHIBA products could cause loss of human life, bodily injury or damage to property. In developing your designs, please ensure that TOSHIBA products are used within specified operating ranges as set forth in the most recent TOSHIBA products specifications. Also, please keep in mind the precautions and conditions set forth in the "Handling Guide for Semiconductor Devices," or "TOSHIBA Semiconductor Reliability Handbook" etc.. * The TOSHIBA products listed in this document are intended for usage in general electronics applications (computer, personal equipment, office equipment, measuring equipment, industrial robotics, domestic appliances, etc.). These TOSHIBA products are neither intended nor warranted for usage in equipment that requires extraordinarily high quality and/or reliability or a malfunction or failure of which may cause loss of human life or bodily injury ("Unintended Usage"). Unintended Usage include atomic energy control instruments, airplane or spaceship instruments, transportation instruments, traffic signal instruments, combustion control instruments, medical instruments, all types of safety devices, etc.. Unintended Usage of TOSHIBA products listed in this document shall be made at the customer's own risk. * The products described in this document are subject to the foreign exchange and foreign trade laws. * The information contained herein is presented only as a guide for the applications of our products. No responsibility is assumed by TOSHIBA CORPORATION for any infringements of intellectual property or other rights of the third parties which may result from its use. No license is granted by implication or otherwise under any intellectual property or other rights of TOSHIBA CORPORATION or others. * The information contained herein is subject to change without notice.
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