TA8217P

TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic TA8217P Dual Audio Power Amplifier TA8217P is dual audio power amplifier designed for the audio power amplifier of portable radio cassette tape recorder. Features · High output power: Pout = 2.5W (typ.) (VCC = 9V, RL = 4Ω, f = 1kHz, THD = 10%) · Soft clip · Built−in thermal shutdown protection circuit · Wide operating supply voltage range : VCC = 4.5~12V (Ta = 25°C) Block Diagram Weight: 1.4g (typ.) TA8217P 1 2002-10-30 TA8217P Precautions For Use And Application (1) Input stage The input stage of power amplifier is comprised of a PNP differential pair preceded by a PNP emitter follower which allows DC referencing of the source signal to ground. This eliminates the need for an input coupling capacitor. However, in case the brush noise of volume becomes a problem, provide serially a coupling capacitor to the input side. (2) Adjustment of voltage gain The voltage gain is fixed at Gv≒56.5dB by the resistors (R1 and R2) in IC, however, its reduction is possible through adding Rf as shown in Fig.1. In this case, the voltage gain is obtained by the following equation. Gv≒20ℓog R1 + R2 + Rf R1 + Rf It is recommeded to use this IC with the voltage gain of Gv = 40dB or over. (3) Measures against oscillation For the capacitors C6 and C7 to be applied for preventing the oscillation between output terminal and GND, use the polyester film capacitor having superior quality in high frequency and temperature characteri...