LM4915 Used In Double-Channel Amplification Circuit

Published:2011/7/16 8:09:00 Author:Robert | Keyword: Double-Channel, Amplification | From:SeekIC

The picture shows the LM4915 used in double-channel amplification circuit. The left, right sound-channel signals would input to the LM4915's pin 8 and pin 3 separately. After the internal amplifier's amplification the signals would output from the pin 6 and pin 5 separately and then coupling on their own sound-channel speaker directly. The LM4915 amplifier gain is determined by its internal resistance Ri and Rf and the internal certain gain is set to 6dB. The amplifier's maximum power consumption would be PDMAX=4VDD2／π2RL in push-pull output coupling mode and would be PDMAX=VDD2／π2RL in single-port output coupling mode. fc=1／2πRiCi and the Ri=20kΩ. The LM4915's pin 1 is connected external closing control switch. When the pin 1 is connected to high voltage level, (1.8V could be high voltage level), it would allow to work. When the pin 1 is connected to low voltage level, (0.4V could be low voltage level), it would prohibit working to reduce the chip's power consumption.



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