BA5152F

Audio ICs 1.5V / 15mW dual power amplifier BA5152F The BA5152F is a dual-channel power amplifier designed for 1.5V headphone stereos. The circuit consists of a power supply circuit, mute circuit, bias circuit, and two amplifier circuits. To simplify assembly, the gain is fixed, so external negative-feedback components are not required. FApplications 1.5V headphone Hi-Fi stereos FFeatures 1) High output. POUT = 15mW (RL = 16Ω). 2) Small “pop” noise. 3) Mute circuit terminal provided. 4) Terminals provided for radiation countermeasures. FBlock diagram 5) 6) 7) 8) Good ripple rejection ratio. Few external components required. Good low-voltage characteristics. Built-in power switch circuit. FAbsolute maximum ratings (Ta = 25_C) 367 Audio ICs FRecommended operating conditions (Ta = 25_C) BA5152F FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 1.5V, f= 1kHz and RL = 16Ω) FMeasurement circuit 368 Audio ICs FApplication example BA5152F FApplication board patterns FApplication board component layout 369 Audio ICs FComplete application example circuit BA5152F FCircuit description (1) Power supply block The BA5152F has an internal power switch, so the VCC terminal (pin 9) connects directly to the power source. Pin 13 is the power switch, and if it is left open, no bias current flows in the circuit and the IC will not operate. (2) Mute circuit block When pin 13 is connected to VCC, the IC starts up, but the mute circuit operates to suppress a “pop...