BOSE SoundDock 10 TOP free download

File name SoundDock_10_TOP.pdf

SoundDock 10 Theory of Operation Power Amplifier Power Amplifier electronics integrated into same PCB as 24V switching power supply Class `D' switching amplifiers drive 3 audio channels TI TPA3100D2 drives stereo "twiddler" transducers NXP TDF8599TH drives single woofer channel (dual channel amplifier configured for mono operation with paralleled outputs) Block Diagram Audio Path Continuous analog differential audio inputs from DSP (3 channels) Power Amp ICs provide effective voltage gain of 20x for bass channel, 10x for twiddler channels Outputs of amplifiers are Pulse-Width-Modulated, requires 2nd order low-pass L-C filters to reconstruct continuous signals prior to speaker loads 1 SoundDock 10 Theory of Operation Amplifier Characteristics Supply voltage: +24V Full scale output (after filter): 18V peak into 1.5 ohms for bass 14V peak into 3.5 ohms for twiddlers Full scale input from DSP: 0.95V for bass 1.5V for twiddler channels PWM switching frequency: 288kHz Synchronized to PA_SYNCH_CLK provided by DSP PWM modulation mode: `BD' Bass Amplifier Configuration Slave mode for externally supplied clock Internal PLL disabled BD modulation I2C bus disabled Paralleled outputs Load detection and DC offset protection disabled Twiddler Amplifier Configuration Slave mode for externally supplied clock Gain set to 20dB (GAIN0 and GAIN1 pins grounded) Uses internal PLL (cannot be disabled) Output Filters 2nd order low-pass L-C Inductor is "planar" construction