Overview ft2725 is a high efficiency, low EMI, stereo with adjustable maximum output power (APL) and automatic gain control (ALC) output filter-free Class-D audio power amplifier. When ft2725 can 3.7V ~ 9V working in the power supply voltage 9V, THD + N up to 10% can be output 11W of power at each 4Ω speaker or 15W power output on a single 3Ω speaker (PBTL high mode below). ft2725 with adjustable output power of the automatic gain control (ALC) function, which continuously monitors the amplitude of the output signal and reduce the output signal when the signal is too large, to prevent the input of music, speech signal amplitude is too large or power Output signal clipping distortion (producing broken sound) voltage drop caused by significantly improving sound quality. ft2725 the ALC function can monitor the supply voltage, the output power in case of losing it as large as possible, while APL function allows the user to set the maximum allowable output power by external devices. ft2725 with high efficiency (up to 90%), high PSRR (75dB @ 1kHz) and low EMI characteristics, greatly reduces the complexity of the design and production, reducing system cost, reduce the PCB area. In addition, ft2725 also a shutdown mode to reduce current consumption, and there are a variety of protection mechanisms to ensure the safe and reliable chips work. ? Application portable speakers, Bluetooth speakers, FM plug-in speaker MP3 / MID / DVD-performance sound system small LCD TV / monitor feature a wide operating voltage range:?????? 3.7V to 9.0V adjustable? The maximum output power of the automatic gain control (ALC) function? up to 90% efficiency? NON-ALC mode at maximum output power (VDD = 9V, VALC> 0.5VDD, 10% THD + N) 6W / Ch (8Ω speaker) 11W / Ch (4Ω speaker) 15W (3Ω speaker, PBTL mode)? ALC mode under constant output power (VDD = 9V, VALC = 0V, 0.3% THD + N) 4.5W / Ch (8Ω speaker) 8.5W / Ch ? (under 3Ω speaker, PBTL mode) (4Ω speaker) 11.5W THD + N: 0.06% (VDD = 9V, f = 1kHz, 4Ω speaker, Po = 5W) PSRR:? 75dB @ 1kHz up to 10dB of dynamic range ALC? ? Gain:? 32.4dB with volume fade-in / fade-out function mute function selectable spread spectrum (SS) to further reduce EMI PBTL optional feature to drive a single low-impedance speaker resettable overcurrent / short circuit protection????? over-temperature protection Package:? TSSOP-24L and QFN5x5-28L