NXP TDF8551J I2C总线控制4x45W功率放大方案

NXP公司的TDF8551J是采用BCDMOS技术的I2C总线控制4x45W功率放大器,包含有四个BTL配置的放大器,能驱动四个扬声器:两个前面和两个后面通路.每个放大器可独立配置,线路驱动模式的增益为20dB,放大模式的增益为26dB.此外, TDF8551J还集成了6个输出电压稳压器和两个功率开关.本文介绍了TDF8551J主要特性,方框图和测试与应用电路图.

TDF8551J: I2C-bus controlled 4x45 W power amplifier with six voltage regulators

The TDF8551J has a complementary quad audio power amplifier that uses BCDMOS technology. It contains four amplifiers configured in Bridge-Tied Load (BTL) to drive four speakers: two front and two rear channels. The I2C-bus enables diagnostic information of each amplifier and its speaker to be read separately. Both front and both rear channel amplifiers can be configured independently in line driver mode with a gain of 20 dB (differential output) or amplifier mode with a gain of 26 dB (BTL output).

The TDF8551J has six output voltage regulators and two power switches:

• Four switchable regulators and two standby regulators

• Two power switches with loss-of-ground protection and surge protection

• Second supply pin to reduce dissipation by means of an external DC-to-DC converter

• Backup functionality for regulator 2

TDF8551J主要特性:
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