ST公司的TS2012是無濾波器的2x2.8W立體聲D類全差分音頻功率放大器,5V工作時,每路能向8歐姆負載提供1.35W功率, 能提供和AB類音頻放大器相比擬的效率.有四種增益可供選擇: 6, 12, 18或24 dB. TS2012很適合用在手機,PDA和平板電視機.本文介紹了TS2012的主要特性,方框圖以及典型應用電路.此外還介紹了基于TS2012的演示板
STEVAL-CCA007V1的主要特性,電路圖和材料清單(BOM).
TS2012 Filter-free stereo 2x2.8W class D audio power amplifer
The TS2012 is a stereo fully differential class D power amplifier. Able to drive up to 1.35W into an 8 ohmload at 5V per channel. It achieves outstanding efficiency compared to typical class
AB audio amps.
The device has four different gain settings utilizing two discrete pins: G0 and G1.
Pop & click reduction circuitry provides low on/off switch noise while allowing the device to start within 1ms.
Two standby pins (active low) allow each channel to be switched off independently.
The TS2012 is available in a QFN20 package in 4x4 mm dimension.
主要特性:
■Operating range from VCC=2.5V to 5.5V
■Standby mode active low
■Output power per channel : 1.35W @5V or 0.68W @ 3.6V into 8 ohmwith 1% THD+N max.
■Output power per channel : 2.2W @5V into 4ohm with 1% THD+N max.
■Four gains select : 6, 12, 18, 24 dB
■Low current consumption
■PSRR: 70dB typ @ 217Hz with 6dB gain.
■Fast start-up phase: 1ms
■Thermal shutdown protection
■QFN20 4x4mm lead-free package
應用:
■Cellular phone
■PDA
■Flat panel TV
圖1.TS2012方框圖
圖2.TS2012應用電路
圖2.TS2012典型應用電路
STEVAL-CCA007V1演示板
STEVAL-CCA007V1: Filter-free stereo 2 x 2.8 W class D audio power amplifier based on TS2012IQT
This demonstration board is designed for evaluation of the TS2012, a fully differential class D stereo power amplifier. The TS2012 device is housed in a QFN package and mounted on a twolayer PCB with a copper area acting as a heatsink. Easily accessible connectors on the board allow changing or driving gain select pins (G0 and G1) and standby control pins. It is also possible to change the input configuration of the TS2012.
STEVAL-CCA007V1演示板主要特性:
Operating range from VCC = 2.5 V to 5.5 V
Standby mode active low
Output power per channel: 1.3 5 W at 5 V or 0.68 W at 3.6 V into 8 Ω with 1% THD+N max
Output power per channel: 2.2 W at 5 V into 4 Ω with 1% THD+N max
Four gain select settings: 6, 12, 18, 24 dB
Low current consumption
PSRR: 70 dB typ at 217 Hz with 6 dB gain
Fast start-up phase: 1 ms
Thermal shutdown protection
QFN20 4x4 mm lead-free package
圖3.STEVAL-CCA007V1演示板電路圖
STEVAL-CCA007V1演示板材料清單(BOM)
|
