- 您現(xiàn)在的位置：買(mǎi)賣IC網(wǎng) > PDF目錄10282 > NCP2809ADMR2 (ON Semiconductor)IC AMP STEREO AUD 135ME MICRO-10 PDF資料下載
參數(shù)資料
| 型號(hào)： | NCP2809ADMR2 |
| 廠商： | ON Semiconductor |
| 文件頁(yè)數(shù)： | 6/24頁(yè) |
| 文件大小： | 0K |
| 描述： | IC AMP STEREO AUD 135ME MICRO-10 |
| 產(chǎn)品變化通告： | LTB Notification 03/Jan/2008 |
| 標(biāo)準(zhǔn)包裝： | 4,000 |
| 系列： | NOCAP™ |
| 類型： | AB 類 |
| 輸出類型： | 耳機(jī)，2-通道（立體聲） |
| 在某負(fù)載時(shí)最大輸出功率 x 通道數(shù)量： | 135mW x 2 @ 16 歐姆 |
| 電源電壓： | 2.2 V ~ 5.5 V |
| 特點(diǎn)： | 消除爆音，短路保護(hù)和熱保護(hù)，關(guān)閉 |
| 安裝類型： | 表面貼裝 |
| 供應(yīng)商設(shè)備封裝： | 10-微型 |
| 封裝/外殼： | 10-TFSOP，10-MSOP（0.118"，3.00mm 寬） |
| 包裝： | 帶卷 (TR) |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)當(dāng)前第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)第20頁(yè)第21頁(yè)第22頁(yè)第23頁(yè)第24頁(yè)
NCP2809 Series
http://onsemi.com
14
APPLICATION INFORMATION
Detailed Description
The NCP2809 power audio amplifier can operate from
2.6 V to 5.0 V power supply. It delivers 24 mWrms output
power to a 16
W load (VP = 2.4 V) and 131 mWrms output
power to a 16
W load (VP = 5.0 V).
The structure of NCP2809 is basically composed of two
identical internal power amplifiers; NCP2809A has a fixed
internal gain of 0 dB and the gain can be set externally with
the NCP2809B.
Internal Power Amplifier
The output Pmos and Nmos transistors of the amplifier are
designed to deliver the specified output power without
clipping. The channel resistance (Ron) of the Nmos and Pmos
transistors does not exceed 3.0
W when driving current.
The structure of the internal power amplifier is
composed of three symmetrical gain stages, first and
medium gain stages are transconductance gain stages in
order to maximize bandwidth and DC gain.
TurnOn and TurnOff Transitions
A Turnon/off transition is shown in the following plot
In order to eliminate “pop and click” noises during
transitions, output power in the load must be slowly
established or cut. When logic high is applied to the
shutdown pin, the bypass voltage begins to rise
exponentially and once the output DC level is around the
common mode voltage, the gain is established slowly
(50 ms). This way to turnon the device is optimized in
terms of rejection of “pop and click” noises.
A theoretical value of turnon time at 25
°C is given by
the following formula.
Cby: Bypass Capacitor
R: Internal 300 k resistor with a 25% accuracy
Ton = 0.95 * R * Cby
When logic is turned low on shutdown pin, the device
enters in shutdown mode:
50 ms later the audio signal is cut off as the gain is
turned to zero internally as shown in Figure 41.
385 ms later, the DC signal will reach 0.7 V due to
exponential discharge of the bypass voltage. It is then tied
to Ground as shown in Figure 40.
A theoretical approach of this time is:
Toff = R * Cby * Ln(Vp/1.4)
Shutdown Function
The device enters shutdown mode when shutdown signal
is low. During the shutdown mode, the DC quiescent
current of the circuit does not exceed 600 nA.
Current Limit Protection Circuitry
The maximum output power of the circuit (POrms =
135 mW, VP = 5.0 V, RL = 16 W) requires a peak current in
the load of 130 mA.
In order to limit excessive power dissipation in the load
when a shortcircuit occurs, the current limit in the load is
fixed to 250 mA. The current in the output MOS transistors
is realtime monitored, and when exceeding 250 mA, the
gate voltage of the corresponding MOS transistor is clipped
and no more current can be delivered.
Thermal Overload Protection Circuitry
Internal amplifiers are switched off when temperature
exceeds 160
°C, and will be switched back on only when the
temperature goes below 140
°C.
NCP2809 is a stereo power audio amplifier.
If the application requires a Single Ended topology with
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 + 1
2p
p
0
Vo
RL
sin(t)dt +
Vo
p.RL
PTOT +
Vp.Vo
p.RL
The power in the load is POUT.
POUT +
VO2
2RL
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| D38999/26WJ24BB | CONN HSG PLUG 24POS STRGHT SCKT |
| D38999/24WH53SALC | CONN HSG RCPT 53POS JAM NUT SCKT |
| VE-2NK-MY | CONVERTER MOD DC/DC 40V 50W |
| AD7324BRUZ-REEL7 | IC ADC 12BIT+ SAR 4CHAN 16TSSOP |
| D38999/26WJ19AN | CONN HSG PLUG 19POS STRGHT PINS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NCP2809ADMR2G | 功能描述:音頻放大器 135mW Stereo Audio PWR Industrial Temp RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| NCP2809AEVB | 功能描述:音頻 IC 開(kāi)發(fā)工具 RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評(píng)估:TAS5614L 工作電源電壓:12 V to 38 V |
| NCP2809B | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:NOCAP 135 mW Stereo Headphone Power Amplifier |
| NCP2809BDMR2 | 功能描述:音頻放大器 135mW Stereo Audio RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| NCP2809BDMR2G | 功能描述:音頻放大器 135mW Stereo Audio PWR Industrial Temp RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。