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参数资料
| 型号： | NCP2809ADMR2 |
| 厂商： | ON Semiconductor |
| 文件页数： | 7/24页 |
| 文件大小： | 0K |
| 描述： | IC AMP STEREO AUD 135ME MICRO-10 |
| 产品变化通告： | LTB Notification 03/Jan/2008 |
| 标准包装： | 4,000 |
| 系列： | NOCAP™ |
| 类型： | AB 类 |
| 输出类型： | 耳机，2-通道（立体声） |
| 在某负载时最大输出功率 x 通道数量： | 135mW x 2 @ 16 欧姆 |
| 电源电压： | 2.2 V ~ 5.5 V |
| 特点： | 消除爆音，短路保护和热保护，关闭 |
| 安装类型： | 表面贴装 |
| 供应商设备封装： | 10-微型 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
NCP2809 Series
http://onsemi.com
15
The dissipated power by the device is
PD + PTOT * POUT
PD +
Vo
RL
VP
p *
VO
2
At a given power supply voltage, the maximum power
dissipated is:
PDmax +
VP2
2p2.RL
Of course, if the device is used in a typical stereo
application, each load with the same output power will give
the same dissipated power. Thus the total lost power for the
device is:
PD +
Vo
RL
2VP
p *
VO
And in this case, the maximum power dissipated will be:
PDmax +
VP2
p2.RL
In single ended operation, the efficiency is:
h +
p.VO
2VP
If the application requires a NOCAP scheme without
output coupling capacitors, then the current provided by
the battery for one output is as following:
Vo(t) is the AC voltage seen by the load. Here we
consider a sine wave signal with a period T and a peak
voltage VO.
RL is the load.
T
TIME
T/2
VO/RL
Ip(t)
So, the total power delivered by the battery to the device is:
PTOT + Vp
Ipavg
Ipavg + 1p
p
0
Vo
RL
sin(t)dt +
2Vo
p.RL
PTOT +
2Vp.Vo
p.RL
The power in the load is POUT
POUT +
VO2
2RL
The dissipated power by the device is
PD + PTOT * POUT
PD +
Vo
RL
2VP
p *
VO
2
At a given power supply voltage, the maximum power
dissipated happens when VO = Vp/2.
PDmax +
0.19VP2
RL
Of course, if the device is used in a typical stereo
application, each load with the same output power will give
the same dissipated power. Thus the total lost power for the
device is:
PD +
Vo
RL
4VP
p *
VO
And in this case, the maximum power dissipated will be:
PDmax +
0.38VP2
RL
In NOCAP operation, the efficiency is:
h +
p.VO
4VP
GainSetting Selection
With NCP2809 Audio Amplifier family, you can select
a closedloop gain of 0db for the NCP2809A and an
external gain setting with the NCP2809B. In order to
optimize device and system performance, NCP2809 needs
to be used in low gain configurations. It minimizes THD+N
values and maximizes the signaltonoise ratio, and the
amplifier can still be used without running into the
bandwidth limitations.
NCP2809A can be used when a 0 dB gain is required.
Adjustable gain is available on NCP2809B.
NCP2809 Amplifier External Components
Input Capacitor Selection (Cin)
The input coupling capacitor blocks the DC voltage at
the amplifier input terminal. This capacitor creates a
highpass filter with the internal (A version with 20 k
W) or
external (B version) resistor. Its cutoff frequency is given
by:
fc +
1
2* p *Rin *Cin
(eq. 1)
The size of the capacitor must be large enough to couple
in low frequencies without severe attenuation. However a
large input coupling capacitor requires more time to reach
its quiescent DC voltage (VP/2) and can increase the
turnon pops.
An input capacitor value of 100 nF performs well in
many applications (in case of Rin = 20 kW).
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP2809ADMR2G | 功能描述:音频放大器 135mW Stereo Audio PWR Industrial Temp 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 |
| NCP2809AEVB | 功能描述:音频 IC 开发工具 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 |
| NCP2809B | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:NOCAP 135 mW Stereo Headphone Power Amplifier |
| NCP2809BDMR2 | 功能描述:音频放大器 135mW Stereo Audio 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 |
| NCP2809BDMR2G | 功能描述:音频放大器 135mW Stereo Audio PWR Industrial Temp 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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