ADI公司的ADAU1592 D类音频功率放大器集成了一个Σ-Δ调制器,是两路的桥式连接负载(BTL)的开关式音频功率放大器.它的动态范围达到101dB,THD+N为0.005%.工作电压从9V到18V,8欧姆负载时的效率大于90%,主要应用在平板电视,PC音频系统和密你音频设备:本文主要介绍了ADAU1592的主要性能,功能方框图以及应用电路图.

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
应用范围:
Flat panel televisions
PC audio systems
Mini-components



图1. ADAU1592功能方框图.

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).



图2. ADAU1592应用电路图.