基于TPA2028D1設計的3W無濾波器D類音頻放大技術
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The TPA2028D1 is a mono, filter-free Class-D audio power amplifier with volume control, dynamic range compression (DRC) and automatic gain control (AGC). It is available in a 1,63 mm x 1,63 mm wafer chip-scale package (WCSP).
The DRC/AGC function in the TPA2028D1 is programmable via a digital I2C interface. The DRC/AGC function can be configured to automatically prevent distortion of the audio signal and enhance quiet passages that are normally not heard. The DRC/AGC can also be configured to protect the speaker from damage at high power levels and compress the dynamic range of music to fit within the dynamic range of the speaker. The gain can be selected from C28 dB to +30 dB in 1-dB steps.
TPA2028D1主要特性:
Fast AGC Start-up Time: 5 ms
Pin-out Compatible with TPA2018D1
Filter-Free Class-D Architecture
3 W Into 4
at 5 V (10% THD+N) 880 mW Into 8
at 3.6 V (10% THD+N) Power Supply Range: 2.5 V to 5.5 V
Flexible Operation With/Without I2C
Programmable DRC/AGC Parameters
Digital I2C Volume Control
Selectable Gain from C28 dB to 30 dB in 1-dB Steps (when compression is used)
Selectable Attack, Release and Hold Times
4 Selectable Compression Ratios
Low Supply Current: 1.8 mA
Low Shutdown Current: 0.2µA
High PSRR: 80 dB
AGC Enable/Disable Function
Limiter Enable/Disable Function
Short-Circuit and Thermal Protection
Space-Saving Package
1,63 mm × 1,63 mm Nano-Free WCSP (YZF)
TPA2028D1應用:
Wireless or Cellular Handsets and PDAs
Portable Navigation Devices
Portable DVD Player
Notebook PCs
Portable Radio
Portable Games
Educational Toys
USB Speakers
圖1.TPA2028D1功能方框圖
圖2.TPA2028D1指標測試方框圖
圖3.TPA2028D1簡化應用方框圖
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