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參數(shù)資料
| 型號(hào)： | NCP4896 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | 1.0Watt Audio Power Amplifier with Earpiece Driving Capability(1.0W立體聲單端/差動(dòng)音頻放大器) |
| 中文描述： | 1.0Watt音頻功率放大器驅(qū)動(dòng)能力與聽(tīng)筒（1.0W立體聲單端/差動(dòng)音頻放大器） |
| 文件頁(yè)數(shù)： | 12/16頁(yè) |
| 文件大?。?/td> | 126K |
| 代理商： | NCP4896 |
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NCP4896
http://onsemi.com
12
Thermal Overload Protection
Internal amplifiers are switched off when the
temperature exceeds 160
°
C, and will be switched on again
only when the temperature decreases below 140
°
C.
The NCP4896 is unitygain stable and requires no
external components besides gainsetting resistors, an
input coupling capacitor and a proper bypassing capacitor
in the typical application.
Both internal amplifiers are externally configurable (RF
and R
in
) with gain configuration.
The differentialended amplifier presents two major
advantages:
The possible output power is four times larger (the
output swing is doubled) as compared to a singleended
amplifier under the same conditions.
Output pins (OUTA and OUTB) are biased at the same
potential VP/2, this eliminates the need for an output
coupling capacitor required with a singleended
amplifier configuration.
The differential closed loopgain of the amplifier is
*Rf
Rin
Vinrms
the voltage seen by the load and V
inrms
is the rms value of
the input differential signal.
Output power delivered to the load is given by
(Vopeak)2
2 *RL
output voltage).
When choosing gain configuration to obtain the desired
output power, check that the amplifier is not current limited
or clipped.
The maximum current which can be delivered to the load
Vopeak
RL
given by
Avd
Vorms
.
V
orms
is the rms value of
Porms
(Vopeak is the peak differential
is 500 mA
Iopeak
.
GainSetting Resistor Selection (R
in
and RF)
R
in
and RF
set the closedloop gain of both amplifier.
In order to optimize device and system performance, the
NCP4896 should be used in low gain configurations.
The low gain configuration minimizes THD + noise
values and maximizes the signal to noise ratio, and the
amplifier can still be used without running into the
bandwidth limitations.
A closed loop gain in the range from 2 to 5 is
recommended to optimize overall system performance.
An input resistor (R
in
) value of 22 k is realistic in most
of applications, and doesn’t require the use of a too large
capacitor C
in
.
Input Capacitor Selection (C
in
)
The input coupling capacitor blocks the DC voltage at
the amplifier input terminal. This capacitor creates a
highpass filter with Rin, the cutoff frequency is given by
1
2 *
*Rin* Cin
The value of the capacitor must be high enough to ensure
good coupling at low frequencies without 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 between 0.1 and 0.39 F
performs well in many applications (With R
in
= 22 k ).
fc
.
Bypass Capacitor Selection (Cby)
The bypass capacitor Cby provides halfsupply filtering
and determines how fast the NCP4896 turns on.
This capacitor is a critical component to minimize the
turnon pop. A 1.0
F bypass capacitor value
(C
in
= < 0.39 F) should produce clickless and popless
shutdown transitions. The amplifier is still functional with
a 0.1 F capacitor value but is more susceptible to “pop and
click” noises.
Thus, a 1.0 F bypassing capacitor is recommended.
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| NCP4896/D | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:1W Audio Amplifier with Earpiece Driving Capability |
| NCP4896EVB | 功能描述:音頻 IC 開(kāi)發(fā)工具 ANA NCP4896 EVAL BRD RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類(lèi)型:Audio Amplifiers 工具用于評(píng)估:TAS5614L 工作電源電壓:12 V to 38 V |
| NCP4896FCT1G | 功能描述:音頻放大器 1W Audio w/EarPiece Driving Ind. Temp RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類(lèi)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 |
| NCP500 | 制造商:ONSEMI 制造商全稱(chēng):ON Semiconductor 功能描述:AC-DC Offline Switching Controllers/Regulators |
| NCP500/D | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:150 mA CMOS Low Noise Low-Dropout Voltage Regulator |
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