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:
Amplifiers
I2C-bus control
Can drive a 2 load with a battery voltage of up to 16 V and a 4 load with a battery voltage of up to 18 V
DC load detection: open, short and present
AC load (tweeter) detection
Programmable clip detect; 1 % or 3 %
Programmable thermal protection pre-warning
Independent short-circuit protection for each channel
Selectable line driver (20 dB) and amplifier mode (26 dB)
Loss-of-ground and open VP safe
All outputs protected from short-circuit to ground, to VP or across the load
All pins protected from short-circuit to ground
Soft thermal-clipping to prevent audio holes
Low battery detection
Voltage regulators and switches
I2C-bus contr...