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File name BA5415A.pdf

Audio ICs High-output dual power amplifier BA5415A / BA5416 The BA5415A and BA5416 are dual power amplifier ICs that operate off a 9V to 15V supply. When driving a 4 load off a 9V supply, the BA5415A does not require a heatsink. The BA5416 uses a lost-cost package. The basic characteristics (total harmonic distortion etc.) of the amplifiers are excellent, and both ICs include a standby switch function. FApplications Radio cassette players. FFeatures 1) High output. POUT = 5.4W (VCC = 12V, RL = 3 and THD = 10%) POUT = 2.5W (VCC = 9V, RL = 4 and THD = 10%) 2) Excellent audio quality. THD = 0.1% (f = 1kHz, PO = 0.5W) VNO = 0.3mVrms (Rg = 10k) RR = 60dB (fRR = 100Hz) 3) Wide operating power suppy voltage range. VCC = 5.0V to 18.0V (BA5416: 5.0V to 15.0V) 4) Switching noise ("pop" noise) generated when the power is switched on and off is small. 5) Ripple mixing when motor starts has been prevented. 6) Built-in thermal shutout. 7) Built-in standby switch. Output is not influenced by the standby pin voltage. 8) "On" mute time does not depend on VCC. 9) Soft clipping. 10) Heatsink not required (for BA5415A, with VCC = 9V and RL y 4). FAbsolute maximum ratings (Ta = 25_C) FRecommended operating conditions (Ta = 25_C) 395 Audio ICs FBlock diagram BA5415A / BA5416 FInternal circuit configuration 396 Audio ICs BA5415A / BA5416 FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 12V, RL = 3, RF = 240, Rg = 600, and f = 1kHz) FMeasurement circuit 397 Audio ICs FApplication examples BA5415A / BA5416 398 Audio ICs FOperation notes (1) Input circuit The structure of the input circuit is shown in Fig. 4. The IC can be used without coupling capacitors, but a maximum of 0.5µA of bias current (IBIN) flows from the input pin, so if potentiometer sliding noise results from this, connect an input capacitor CIN as shown below. To prevent degradation of the IC characteristics, the input bias resistor is not built into the IC. Connect an input bias resistor (RIN) between the input and GND (the recommended value is about 33k). BA5415A / BA5416 (3) Oscillation countermeasures We recommend that the capacitor (C1) connected between the B. S pin and the VCC pin for oscillation prevention be a metal-film component with good temperature and high-frequency characteristics. Ceramic capacitors have poor temperature characteristics, so if used, allow sufficient oscillation margin. It is also possible to connect a capacitor for oscillation prevention between the output and GND (C2). The oscillation margin depends on the PCB pattern and the mounting position of the capacitor. Design your PCB after referring to the application example PCB. (2) Gain adjustment The gain is given by the following formula. RNF)RF GV = 20log RF It is possible to reduce the gain by increasing RF, but the amount of feedback will increase, and oscillation will be more likely to occur. We recommend that you set the gain to 30dB or higher. (4) VCC and GND lines The Pre. GND