圣邦微代理 SGM4700 2×23W 立体声 D 类音频功放详细介绍

The SGM4700 is a high-power, high-efficiency, stereo  Class-D audio power amplifier with adjustable power limit  (APL) and automatic level control (ALC). It operates with a  wide range of supply voltages from 5V to 20V. With 15V  supply voltage, it can deliver 2 脳 23W output power for a pair  of 4惟 speakers with 1% THD+N, or an ALC output power of 2  脳 20W with THD+N less than 0.5%.  The high efficiency of SGM4700 extends battery life in playing  music and allows it to deliver an output power of 2 脳 20W  without the need for a bulky heat sink on a two-layer system  board. Its high PSRR and low EMI emission reduce system  design and manufacturing complexities, as well as lower  system cost.  The SGM4700 features APL and ALC. The APL limits peak  audio outputs to a user-defined value to protect audio  speakers from excessive power dissipation or over-load. The  APL and ALC adjust the voltage gain of the audio amplifiers in  response to over-limit audio inputs, eliminating output clipping  distortion while maintaining a maximally allowed dynamic  range of audio outputs. The limiting voltage of APL and ALC  can be either a user-defined value or the supply voltage.  The SGM4700 can be configured into driving either a pair of  speakers in Bridge-Tied-Load (BTL) configuration for stereo  applications or a single speaker in Parallel BTL (PBTL)  configuration for mono applications. The SGM4700 features two PWM modulation schemes for  Class-D audio amplifiers: Dual-Side-Modulation (DSM) and Single-Side-Modulation (SSM).  In SGM4700, comprehensive protection modes against  various operating faults ensure its safe and reliable operation.