The HTA8128 is a stereo Class D audio amplifier integrated a boost converter. With wide input voltage range, HTA8128 supports applications with single cell, two cell Lithium batteries, 5V or 12V power supply and so on, and can drive two speakers in BTL mode or one speaker in paralleled PBTL mode. HTA8128 built-in boost converter supports selectable output voltage by external resistors for different applications with different power requirements. It also implements an adjustable switching peak current limit function through external resistors. HTA8128 has a filter-less modulation circuit which can directly drive speakers. HTA8128 can be shut down so that the power consumption can be minimized. As for protection function, over current protection function for speaker output terminals, over temperature protection function, low supply voltage malfunction preventing function and over boost voltage protection are also prepared.HTA8128是一款内置升压的立体声D类音频功率放大器，其支持单节锂电、双节锂电串联、5V、12V等多种输入，升压后的电压提供给功放供电，功放支持双通道立体声BTL输出以及并联PBTL单声道输出。 HTA8128内置的升压电路，可通过FB脚设置升压值，以满足不同的输出功率需求。其还可通过外置电阻调节开关峰值电流限值。此外，HTA8128内部集成免滤波器调制技术，能够直接驱动扬声器，内置的关断功能使待机电流最小化，还集成了输出端过流保护、片内过温保护、输入电源欠压异常保护、升压电压过压保护等功能。