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参数资料
| 型号： | TPA3117D2RHBR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | AUDIO AMPLIFIER, PQCC32 |
| 封装： | 5 X 5 MM, GREEN, PLASTIC, QFN-32 |
| 文件页数： | 7/30页 |
| 文件大小： | 850K |
| 代理商： | TPA3117D2RHBR |
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TPA3117D2 Power Limit Function
Vin=1.13
Freq=1kHz RLoad=8W
VPP
PLIMIT = 1.8V Pout = 5W
PLIMIT = 3V Pout = 10W
PLIMIT = REG_OUT Pout = 11.8W
Vinput
www.ti.com
SLOS672 – OCTOBER 2010
DEVICE INFORMATION
Gain setting via GAIN0 and GAIN1 inputs
The gain of the TPA3117D2 is set by two input terminals, GAIN0 and GAIN1.
The gains listed in Table 1 are realized by changing the taps on the input resistors inside the amplifier. This
causes the input impedance (ZI) to be dependent on the gain setting. The actual gain settings are controlled by
ratios of resistors, so the gain variation from part-to-part is small. However, the input impedance from part-to-part
at the same gain may shift by ±20% due to shifts in the actual resistance of the input resistors.
For design purposes, the input network (discussed in the next section) should be designed assuming an input
impedance of 60 k
, which is the absolute minimum input impedance of the TPA3117D2. At the lower gain
settings, the input impedance could increase as high as 256 k
Table 1. Gain Setting
INPUT IMPEDANCE
AMPLIFIER GAIN (dB)
(k
)
GAIN1
GAIN0
TYP
0
9
213
0
1
12.1
149
1
0
15.2
104
1
18.2
74
SD OPERATION
The TPA3117D2 employs a shutdown mode of operation designed to reduce supply current (ICC) to the absolute
minimum level during periods of nonuse for power conservation. The SD input terminal should be held high (see
specification table for trip point) during normal operation when the amplifier is in use. Pulling SD low causes the
outputs to mute and the amplifier to enter a low-current state. Never leave SD unconnected, because amplifier
operation would be unpredictable.
For the best power-off pop performance, place the amplifier in the shutdown mode prior to removing the power
supply voltage. 5V regulator (REG_OUT) is active in the shutdown state.
PLIMIT
The voltage at pin 7 can used to limit the power to levels below that which is possible based on the supply rail.
Add a resistor divider from REG_OUT to ground to set the voltage at the PLIMIT pin. An external reference may
also be used if tighter tolerance is required. Also add a 1mF capacitor from pin 7 to ground.
Figure 34. PLIMIT Circuit Operation
Copyright 2010, Texas Instruments Incorporated
15
Product Folder Link(s) :TPA3117D2
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相关代理商/技术参数 |
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|---|---|
| TPA3117D2RHBT | 功能描述:音频放大器 10W Filter-Free Stereo Class-D Amp 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 |
| TPA3117D2RHBT | 制造商:Texas Instruments 功能描述:; Amplifier Class:D; No. of Channels:2; 制造商:Texas Instruments 功能描述:IC, AUDIO PWR AMP, CLASS D 15W QFN-32 |
| TPA3118D2 | 制造商:TI 制造商全称:Texas Instruments 功能描述:15W,30W,50W Filter-Free Class-D Stereo Amplifier Family with AM Avoidance |
| TPA3118D2DAP | 功能描述:音频放大器 50W Stereo Class-D Audio Amp 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 |
| TPA3118D2DAPR | 功能描述:音频放大器 50W Stereo Class-D Audio Amp 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 |
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