参数资料
| 型号： | NCP2821FCT1G |
| 厂商： | ON Semiconductor |
| 文件页数： | 4/19页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO D 2.65W 9-FLIPCHIP |
| 产品变化通告： | Product Discontinuation 09/Jan/2008 |
| 标准包装： | 3,000 |
| 类型： | D 类 |
| 输出类型： | 1-通道（单声道） |
| 在某负载时最大输出功率 x 通道数量： | 2.65W x 1 @ 4 欧姆 |
| 电源电压： | 2.2 V ~ 5.5 V |
| 特点： | 消除爆音，差分输入，关闭 |
| 安装类型： | 表面贴装 |
| 供应商设备封装： | 9-覆晶 |
| 封装/外壳： | 9-WFBGA，FCBGA |
| 包装： | 带卷 (TR) |
NCP2821
http://onsemi.com
12
DESCRIPTION INFORMATION
Detailed Description
The basic structure of the NCP2821 is composed of one
analog preamplifier, a pulse width modulator and an
Hbridge CMOS power stage. The first stage is externally
configurable with gainsetting resistor Ri and the internal
fixed feedback resistor Rf (the closedloop gain is fixed by
the ratios of these resistors) and the other stage is fixed. The
load is driven differentially through two output stages.
The differential PWM output signal is a digital image of
the analog audio input signal. The human ear is a band pass
filter regarding acoustic waveforms, the typical values of
which are 20 Hz and 20 kHz. Thus, the user will hear only
the amplified audio input signal within the frequency range.
The switching frequency and its harmonics are fully filtered.
The inductive parasitic element of the loudspeaker helps to
guarantee a superior distortion value.
Power Amplifier
The output PMOS and NMOS transistors of the amplifier
have been designed to deliver the output power of the
specifications without clipping. The channel resistance
(Ron) of the NMOS and PMOS transistors is typically 0.3 W.
Turn On and Turn Off Transitions
In order to eliminate “pop and click” noises during
transition, the output power in the load must not be
established or cutoff suddenly. When a logic high is applied
to the shutdown pin, the internal biasing voltage rises
quickly and, 4 ms later, once the output DC level is around
the common mode voltage, the gain is established slowly
(5.0 ms). This method to turn on the device is optimized in
terms of rejection of “pop and click” noises. Thus, the total
turn on time to get full power to the load is 9 ms (typical)
(see Figure 35).
The device has the same behavior when it is turnedoff by
a logic low on the shutdown pin. No power is delivered to the
load 5 ms after a falling edge on the shutdown pin
(see Figure 36). Due to the fast turn on and off times, the
shutdown signal can be used as a mute signal as well.
Shutdown Function
The device enters shutdown mode when the shutdown
signal is low. During the shutdown mode, the DC quiescent
current of the circuit does not exceed 1.5
mA.
Current Breaker Circuit
The maximum output power of the circuit corresponds to
an average current in the load of 820 mA.
In order to limit the excessive power dissipation in the
load if a shortcircuit occurs, a current breaker cell shuts
down the output stage. The current in the four output MOS
transistors are realtime controlled, and if one current
exceeds the threshold set to 1.5 A, the MOS transistor is
opened and the current is reduced to zero. As soon as the
shortcircuit is removed, the circuit is able to deliver the
expected output power.
This patented structure protects the NCP2821. Since it
completely turns off the load, it minimizes the risk of the
chip overheating which could occur if a soft current limiting
circuit was used.
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相关代理商/技术参数 |
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| NCP2823 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:High Efficiency 3W Filterless Class D Audio Amplifier |
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| NCP2823AGEVB | 功能描述:音频 IC 开发工具 NCP2823A EVAL BOARD 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 |
| NCP2823BFCT2G | 功能描述:音频放大器 GRESHAM FCI 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 |
| NCP2823BGEVB | 功能描述:音频 IC 开发工具 NCP2823B EVB 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 |
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