ADI公司的ADAU1592 D類(lèi)音頻功率放大器集成了一個(gè)Σ-Δ調制器,是兩路的橋式連接負載(BTL)的開(kāi)關(guān)式音頻功率放大器.它的動(dòng)態(tài)范圍達到101dB,THD+N為0.005%.工作電壓從9V到18V,8歐姆負載時(shí)的效率大于90%,主要應用在平板電視,PC音頻系統和密你音頻設備:本文主要介紹了ADAU1592的主要性能,功能方框圖以及應用電路圖.

Class-D Audio Power Amplifier ADAU1592
概述:
The ADAU1592 is a 2-channel, bridge-tied load (BTL) switching audio power amplifier with an integrated Σ-Δ modulator.

The modulator accepts an analog input signal and generates a switching output to drive speakers directly. A digital, microcontroller-compatible interface provides control of reset, mute, and PGA gain as well as output signals for thermal and overcurrent error conditions. The output stage can operate from supply voltages ranging from 9 V to 18 V. The analog modulator and digital logic operate from a 3.3 V supply.

主要性能:
Integrated stereo modulator and power stage
0.005% THD + N
101 dB dynamic range
PSRR > 65 dB
RDS-ON < 0.3 Ω (per transistor)
Efficiency > 90% (8 Ω)
EMI-optimized modulator
On/off-mute pop-noise suppression
Short-circuit protection
Overtemperature protection
應用范圍:
Flat panel televisions
PC audio systems
Mini-components



圖1. ADAU1592功能方框圖.

For applications with PVDD > 15 V, add components R1 and R2 (10 Ω typical), C5 and C6 (680 pF typical), and D1 through D8 (CRS01/02).



圖2. ADAU1592應用電路圖.