- 您现在的位置：买卖IC网 > PDF目录98271 > TPA2036D1YZFT (TEXAS INSTRUMENTS INC) 2.5 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA9 PDF资料下载
参数资料
| 型号： | TPA2036D1YZFT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 2.5 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA9 |
| 封装： | 1.45 X 1.45 MM, LEAD FREE, BGA-9 |
| 文件页数： | 11/24页 |
| 文件大小： | 743K |
| 代理商： | TPA2036D1YZFT |
0 V
-5 V
+5 V
Current
OUT+
OUT-
Differential
Voltage
Across
Load
0 V
-5 V
+5 V
Current
OUT+
OUT-
Differential
Voltage
Across
Load
Output = 0 V
Output > 0 V
Efficiency: Why You Must Use a Filter With the Traditional Class-D Modulation Scheme
Effects of Applying a Square Wave Into a Speaker
www.ti.com.............................................................................................................................................................................................. SLOS589 – OCTOBER 2008
Figure 36. The TPA2036D1 Output Voltage and Current Waveforms Into an Inductive Load
The main reason that the traditional class-D amplifier needs an output filter is that the switching waveform results
in maximum current flow. This causes more loss in the load, which causes lower efficiency. The ripple current is
large for the traditional modulation scheme because the ripple current is proportional to voltage multiplied by the
time at that voltage. The differential voltage swing is 2 × VDD and the time at each voltage is half the period for
the traditional modulation scheme. An ideal LC filter is needed to store the ripple current from each half cycle for
the next half cycle, while any resistance causes power dissipation. The speaker is both resistive and reactive,
whereas an LC filter is almost purely reactive.
The TPA2036D1 modulation scheme has very little loss in the load without a filter because the pulses are very
short and the change in voltage is VDD instead of 2 × VDD. As the output power increases, the pulses widen
making the ripple current larger. Ripple current could be filtered with an LC filter for increased efficiency, but for
most applications the filter is not needed.
An LC filter with a cutoff frequency less than the class-D switching frequency allows the switching current to flow
through the filter instead of the load. The filter has less resistance than the speaker that results in less power
dissipated, which increases efficiency.
If the amplitude of a square wave is high enough and the frequency of the square wave is within the bandwidth
of the speaker, a square wave could cause the voice coil to jump out of the air gap and/or scar the voice coil. A
250-kHz switching frequency, however, is not significant because the speaker cone movement is proportional to
1/f2 for frequencies beyond the audio band. Therefore, the amount of cone movement at the switching frequency
is very small. However, damage could occur to the speaker if the voice coil is not designed to handle the
additional power. To size the speaker for added power, the ripple current dissipated in the load needs to be
calculated by subtracting the theoretical supplied power, PSUP THEORETICAL, from the actual supply power, PSUP, at
maximum output power, POUT. The switching power dissipated in the speaker is the inverse of the measured
efficiency,
η
MEASURED, minus the theoretical efficiency, ηTHEORETICAL.
Copyright 2008, Texas Instruments Incorporated
19
Product Folder Link(s): TPA2036D1
相关PDF资料 |
PDF描述 |
|---|---|
| TPA2036D1YZF | 2.5 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA9 |
| TPA2037D1YFFR | 3.24 W, 1 CHANNEL, AUDIO AMPLIFIER, BGA9 |
| TPA2037D1YFFT | 3.24 W, 1 CHANNEL, AUDIO AMPLIFIER, BGA9 |
| TPA2039D1YFFR | 3.24 W, 1 CHANNEL, AUDIO AMPLIFIER, BGA9 |
| TPA2039D1YFFT | 3.24 W, 1 CHANNEL, AUDIO AMPLIFIER, BGA9 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TPA2036D1YZFT | 制造商:Texas Instruments 功能描述:2.5-W Mono Class-D Audio Power Amplifier |
| TPA2037D1 | 制造商:TI 制造商全称:Texas Instruments 功能描述:3.2W Mono Class-D Audio Power Amplifier With 6-dB Gain and Auto Short-Circuit Recovery |
| TPA2037D1YFFEVM | 功能描述:音频 IC 开发工具 TPA2037D1YFFEVM Eval Mod RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压:12 V to 38 V |
| TPA2037D1YFFR | 功能描述:音频放大器 Fixed Gain 3.2 W Mono Class-D RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TPA2037D1YFFT | 功能描述:音频放大器 Fixed Gain 3.2 W Mono Class-D RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
发布紧急采购，3分钟左右您将得到回复。