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The TAS5634 uses a closed-loop feedback design with constant voltage gain. The use of switched mode power supplies (SMPS) makes the internally matched gain resistors ensure high power supply rejection ratio (PSRR) and low output noise.
TAS5634 is a fully integrated power stage compatible with TI's digital input (I2S) audio processor and modulator product portfolio. Similar to TAS5548 and TAS5558, it is also a complete digital input Class D amplifier. The TAS5634 is available in a surface-mount 44-pin HTSSOP package and is a member of the PWM input Class D power stage compatible pin product line (including TAS5612LA, TAS5614LA, and TAS5624A). 
characteristic
Block diagram 
data sheet TAS5634 300W Stereo / 600W Mono High Definition Digital Input, 58V Class D Amplifier Power Stage Data Sheet
TAS5634 300W stereo PurePath (TM) HD digital input high efficiency power stage
TAS5634 is a PWM input Class D amplifier power stage that can provide 2 x 300W (6Ω) or 1 x 600W (3Ω) output power at a nominal supply voltage of 58V. The 58V supply voltage supports higher impedance speaker loads, where BTL is 6Ω and PBTL is 3Ω. The integrated MOSFET and the new gate drive scheme have higher peak efficiency and lower idle loss, which can reduce the size of the heat sink solution.
PWM input, Class D amplifier power stage, compatible with TI digital input (I2S) audio processor and modulator, HD integrated closed-loop feedback, with the following characteristics: When providing 1W power for 6Ω load, THD is 0.025% PSRR is greater than 70dB (no Input signal) SNR greater than 105dB (A-weighted) Output power at 10% THD + N 600W / 3Ω (PBTL mono configuration) 300W / 6Ω (BTL stereo configuration) 230W / 8Ω (BTL stereo configuration) 465W / 3Ω (PBTL Mono configuration) 240W / 6Ω (BTL stereo configuration) 180W / 8Ω (BTL stereo configuration) Efficiency at full scale output power is greater than 91% 1/8 range output power efficiency is greater than 75% 1% THD + N Output power integrated 80 mΩ MOSFET, which can reduce the size of the heat sink. No click device protection at startup: undervoltage protection, overheat protection, overcurrent protection, short circuit protection, and DC speaker protection. Pre-clipped output for class G power control Signal 44-pin HTSSOP (DDV) package with thermal pad on top