ST STA350BW 2x50W 2.1通路数字音频系统解决方案

– 5 V to 26 V (operating range)

– 30 V (absolute maximum rating)

■ Four power output configurations(a)

– 2 channels of ternary PWM (stereo mode) (2 x 50 W into 6 ohm at 25 V)

– 3 channels - left, right using binary and LFE using ternary PWM (2.1 mode) (2 x 18 W + 1 x 40W into 2 x 4 ohm , 1 x 8 ohmat 25 V)

– 2 channels of ternary PWM (2 x 50 W) + stereo lineout ternary

– 1 channel of ternary PWM as Mono BTL (1 x 90 W into 3 ohmat 24.5V)

■ FFX®100 dB SNR and Dynamic Range

■ Selectable 32 to 192 kHz input sample rates

■ I2C control with selectable device address

■ Digital gain/attenuation +42 dB to -80 dB with 0.125 dB/step resolution

■ Soft-volume update with programmable ratio

■ Individual channel and master gain/attenuation

■Two independent DRCs configurable as a dual-band anti-clipper (B2DRC) or independent limiters/compressors

■ EQ-DRC for DRC based on filtered signals

■ Dedicated LFE processing for bass boosting with 0.125 dB/step resolution

■ Audio presets:

– 15 preset crossover filters

– 5 preset anti-clipping modes

– Preset nighttime listening mode

■ Individual channel and master soft/hard mute

■ Independent channel volume and DSP bypass

■ Automatic zero-detect mute

■ Automatic invalid input-detect mute

■ I2S input data interface

■ Input and output channel mapping

■ Up to 8 user-programmable biquads per channel

■ 3 coefficient banks for EQ presets storing with fast recall via I2C interface

■ Extended coefficient dynamic up to -4..4 for easy implementation of high shelf filters

■ Bass/treble tones and de-emphasis control

■ Selectable high-pass filter for DC blocking

■ Advanced AM interference frequency switching and noise suppression modes

■ Selectable high- or low-bandwidth noise-shaping topologies

■ Selectable clock input ratio

■ 96 kHz internal processing sample rate with quantization error noise shaping for very low cutoff frequency filters

■ Thermal overload and short-circuit protection embedded

■ Video apps: 576 x Fs input mode supported

■ Fully compatible with STA339BW and STA339BWS

图1。STA350BW方框图

图2。STA350BW单声道并行BTL电路图

图3。STA350BW电源电路图

图4。STA350BW立体声BTL模式输出配置图

STA350BW 2.0通路演示板

The STA350BW demonstration board is specifically configured for 2.0 BTL channels,releasing up to 2 x 50 W into 6 ohm of power output at 25 V of supply voltage using reduced components. It is a complete solution for the digital audio power amplifier.

图5。STA350BW 2.0通路演示板外形图

图6。STA350BW 测试连接框图

图7。STA350BW 2.0通路演示板电路图

图8。STA350BW 输出滤波器电路图

STA350BW 2.0通路演示板材料清单（BOM）：