參數(shù)資料
型號(hào)： NCP2809BMUTXG
廠(chǎng)商： ON Semiconductor
文件頁(yè)數(shù)： 7/24頁(yè)
文件大小： 0K
描述： IC HEADPHONE PWR AMP 135MW 10DFN
標(biāo)準(zhǔn)包裝： 3,000
系列： NOCAP™
類(lèi)型： AB 類(lèi)
輸出類(lèi)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(lèi)型： 表面貼裝
供應(yīng)商設(shè)備封裝： 10-UDFN（3x3）
封裝/外殼： 10-UFDFN 裸露焊盤(pán)
包裝： 帶卷 (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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