TA8258H Preliminary TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic TA8258H Low-Frequency Power Amplifier The TA8258H is a dual audio power amplifier for TV and home audio use. The device features high power, low noise and low distortion. Features • High output power: Pout = 20 W/channel (VCC = 37 V, RL = 8 Ω, f = 1 kHz, THD = 10%) • Few external parts • Voltage gain: GV = 34dB (typ.) • Total harmonic distortion THD = 0.05% (Pout = 2 W, f = 1 kHz) • Cross talk C.T. = −60dB (f = 1 kHz, Rg = 600 Ω) • Output noise voltage Vno = 0.14 mVrms (Rg = 10 kΩ, BPF = 20 Hz~20 kHz) • Built-in audio muting • Various built-in protection circuits Protection circuits: thermal shutdown, OUT (ac)-GND short. • Operating supply voltage range: VCC = 15 V~42 V (Ta = 25°C) HZIP12-P-1.78B Weight: 4.04 g (typ.) 000707EBF1 • 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. • This product generates heat during normal operation. However, substandard performance or malfunction may cause the product and its peripherals to reach abnormally high temperatures. The product is often the final stage (the external output stage) of a circuit. Substandard performance or malfunction of the destination device to which the circuit supplies output may cause damage to the circuit or to the product. • 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. 2001-01-15 1/7 TA8258H Block Diagram VCC C7 C5 6 Ripple filter C1 IN1 4 9 VCC IN1 OUT1 AMP1 5 400 Ω C10 7 20 kΩ RL C8 C3 3 Pre-GND PW-GND 10 C4 1 C9 400 Ω 20 kΩ C2 IN2 AMP2 OUT2 2 IN2 8 RL 12 C11 11 C6 2001-01-15 2/7 TA8258H Cautions and Application Method 1. Voltage Gain (1) Closed-loop voltage gain is determined by R1 and R2. Input R1 + R2 ) (dB) R2 20 k + 400 = 20 log ( ) (dB) 400 = 34 (dB) G V = 20 log ( (2) Amplifier with gain < 34dB. G V = 20 log ( R1 + R2 + R3 ) (dB) R2 + R3 When R3 = 220 Ω GV = 30 (dB) Is given. Output 4/2 5/1 7/12 R2 R1 400 Ω 20 kΩ C8, C9 Figure 1 Input Output 4/2 R3 5/1 7/12 R2 R1 400 Ω 20 kΩ C8, C9 Figure 2 2. The Mounting Place of an Integrated Circuit This IC cannot withstand the strong electromagnetic fields generated by a CRT. These are likely to cause the device to exhibit malfunctions such as leakage. Please ensure that the IC is kept away from CRT. 3. Preventive Measures Against Oscillation To prevent oscillation, it is advisable to use capacitors made of polyester film, which have low temperature and frequency fluctuation daracteristics, as C8 and C9. The resistance R in series with C8 and C9 performs phase correction at high frequencies and improves the oscillation allowance. (1) Capacitor rating and type (2) PCB layout Note 1: Since the oscillation allowance varies according to the PCB layout, it is recommended that a standard Toshiba PCB be used as a reference for design. 4. It is related with the potential of a Heat-sink Please connected a Heat-sink to GND potential in the case of use, this product. When the Heat-sink is not connected to GND, THD may get worse. 2001-01-15 3/7 TA8258H Standard PCB 12 1 IN-2 GND IN-1 TA8200AH/11AH/16H/58H TOSHIBA OUT2 PWGND OUT1 VCC (bottom view) 2001-01-15 4/7 TA8258H Maximum Ratings (Ta = 25°C) Characteristics Symbol Rating Unit Supply voltage VCC 50 V Output current IO (peak) (3.5) A Power dissipation PD (Note 2) 25 W Operating temperature Topr −25~75 °C Storage temperature Tstg −55~150 °C Note 2: If Ta > 25°C, derate this value by 200 mW/°C. Electrical Characteristics (unless otherwise specified, VCC = 37 V, RL = 8 Ω, f = 1 kHz, Rg = 600 Ω, Ta = 25°C) Symbol Test Circuit Iccq VIN = 0 Pout (1) THD = 10% Pout (2) THD = 1% GV Vout = 0.775 Vrms Total harmonic distortion THD Pout = 2 W Input resistance RIN Output noise voltage Vno Rg = 10 kΩ BPF: 20 Hz~20 kHz Ripple rejection ratio R.R. Cross talk C.T. Characteristics Quiescent current Output power Voltage gain Mute threshold voltage Mute ATT Test Condition Min Typ. Max Unit 75 (110) mA (17) 20 10 32.5 34 35.5 dB 0.05 (0.2) % 30 kΩ 0.13 (0.3) mVrms f = 100 Hz, Vrip = 0.775 Vrms (−40) (−45) dB Vout = 0.775 Vrms (−50) −60 dB Vth (11) Mute ON GND 2.0 V ATT Vout = 0.775 Vrms → Mute (−50) (−60) dB W 2001-01-15 5/7 TA8258H Test Circuit 1000 µF IN1 OUT1 AMP1 5 400 Ω 20 kΩ 400 Ω 20 kΩ AMP2 IN2 2.2 µF 1000 µF PW-GND 10 3 Pre-GND 1 7 2.2 Ω 4 2.2 Ω 2.2 µF 47 µF 47 µF IN1 9 VCC OUT2 2 IN2 8 (*2) 12 0.12 µF 0.12 µF 47 µF 5 Ripple filter VCC RL RL 1000 µF 11 (*1) VTH = 2.8 V *1: Mute ON when pin 11 Low VTH = 2.8 V (typ.), VCC = 37 V, Ta = 25°C *2: Capacitor for reducing popnoise when mute ON 2001-01-15 6/7 TA8258H Package Dimensions HZIP12-P-1.78B Unit: mm Weight: 4.04 g (typ.) 2001-01-15 7/7