參數(shù)資料
型號(hào)： SSM2211-EVAL
廠商： Analog Devices, Inc.
英文描述： Low Distortion, 1.5 W Audio Power Amplifier
中文描述： 低失真，1.5 W音頻功率放大器
文件頁(yè)數(shù)： 16/24頁(yè)
文件大?。?/td> 408K
代理商： SSM2211-EVAL
SSM2211
POWER DISSIPATION
Another important advantage in using a bridged-output config-
uration is the fact that bridged-output amplifiers are more
efficient than single-ended amplifiers in delivering power to a
load. Efficiency is defined as the ratio of power from the power
supply to power delivered to the load
Rev. D | Page 16 of 24
SY
L
P
P
=
η
An amplifier with a higher efficiency has less internal power
dissipation, which results in a lower die-to-case junction tem-
perature as compared to an amplifier that is less efficient. This is
important when considering the amplifier maximum power
dissipation rating vs. ambient temperature. An internal power
dissipation vs. output power equation can be derived to fully
understand this.
The internal power dissipation of the amplifier is the internal
voltage drop multiplied by the average value of the supply
current. An easier way to find internal power dissipation is to
measure the difference between the power delivered by the
supply voltage source and the power delivered into the load.
The waveform of the supply current for a bridged-output
amplifier is shown in Figure 43.
T
T
0
V
OUT
V
PEAK
I
SY
I
DD, PEAK
TIME
I
DD, AVG
TIME
Figure 43. Bridged Amplifier Output Voltage and Supply Current vs. Time
By integrating the supply current over a period, T, then dividing
the result by T, I
DD,AVG
can be found. Expressed in terms of peak
output voltage and load resistance
V
I
π
L
PEAK
R
AVG
DD
2
,
=
(5)
Therefore, power delivered by the supply, neglecting the bias
current for the device, is
V
V
P
π
L
PEAK
DD
SY
R
×
=
2
(6)
The power dissipated by the amplifier internally is simply the
difference between Equation 6 and Equation 3. The equation
for internal power dissipated, P
DISS
, expressed in terms of power
delivered to the load and load resistance, is
L
PEAK
V
DD
π
DISS
P
R
V
×
=
2
2
(7)
The graph of this equation is shown in Figure 44.
OUTPUT POWER (W)
1.5
0
0
1.5
P
0.5
1.0
1.0
0.5
V
DD
= 5V
R
L
= 4
Ω
R
L
= 8
Ω
R
L
= 16
Ω
0
Figure 44. Power Dissipation vs. Output Power with V
DD
= 5 V
Because the efficiency of a bridged-output amplifier (Equation 3
divided by Equation 6) increases with the square root of P
L
, the
power dissipated internally by the device stays relatively flat and
actually decreases with higher output power. The maximum
power dissipation of the device can be found by differentiating
Equation 7 with respect to load power and setting the derivative
equal to zero. This yields
0
1
2
2
1
=
×
π
×
=
L
L
DD
L
DISS
P
P
R
V
P
(8)
and occurs when
L
DD
R
MAX
DISS
P
V
2
π
2
,
2
=
(9)
Using Equation 9 and the power derating curve in Figure 31,
the maximum ambient temperature can be found easily. This
ensures that the SSM2211 does not exceed its maximum
junction temperature of 150°C. The power dissipation for a
single-ended output application where the load is capacitively
coupled is given by
L
L
L
DD
DISS
P
P
P
R
V
×
π
×
=
2
2
(10)
The graph of Equation 10 is shown in Figure 45.
相關(guān)PDF資料
PDF描述
SSM2211SZ1 Low Distortion, 1.5 W Audio Power Amplifier
SSM2211SZ-REEL1 Low Distortion, 1.5 W Audio Power Amplifier
SSM2211SZ-REEL71 Low Distortion, 1.5 W Audio Power Amplifier
SSM2211CP-R2 Low Distortion, 1.5 W Audio Power Amplifier
SSM2211CP-REEL Low Distortion, 1.5 W Audio Power Amplifier
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SSM2211P 制造商:Rochester Electronics LLC 功能描述:1 WATT AUDIO AMPLIFIER - Bulk
SSM2211S 制造商:Analog Devices 功能描述:Audio Amp Speaker 1-CH Mono Class-AB 8-Pin SOIC N 制造商:Rochester Electronics LLC 功能描述:1 WATT AUDIO AMPLIFIER - Bulk 制造商:Analog Devices 功能描述:IC SM AMP AUDIO POWER 1.5W
SSM2211S-REEL 制造商:Analog Devices 功能描述:Audio Amp Speaker 1-CH Mono Class-AB 8-Pin SOIC N T/R 制造商:Analog Devices 功能描述:IC AMP AUDIO
SSM2211S-REEL7 制造商:Analog Devices 功能描述:Audio Amp Speaker 1-CH Mono Class-AB 8-Pin SOIC N T/R 制造商:Rochester Electronics LLC 功能描述:1 WATT AUDIO AMPLIFIER - Tape and Reel
SSM2211SZ 功能描述:IC AMP AUDIO PWR 1W MONO 8SOIC RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻放大器 系列:- 標(biāo)準(zhǔn)包裝:80 系列:- 類型:AB 類 輸出類型:1-通道（單聲道） 在某負(fù)載時(shí)最大輸出功率 x 通道數(shù)量:1.25W x 1 @ 8 歐姆 電源電壓:2.5 V ~ 5.5 V 特點(diǎn):消除爆音，差分輸入，關(guān)閉，熱保護(hù) 安裝類型:表面貼裝 供應(yīng)商設(shè)備封裝:8-MSOP-PowerPad 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:管件 配用:296-31419-ND - EVAL MODULE FOR TPA6205A1 其它名稱:296-34563-5TPA6205A1DGN-ND
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*