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參數(shù)資料
| 型號： | SSM2211CP-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | Low Distortion, 1.5 W Audio Power Amplifier |
| 中文描述： | 1.5 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封裝： | 3 X 3 MM, LFCSP-8 |
| 文件頁數(shù)： | 16/24頁 |
| 文件大小： | 408K |
| 代理商： | SSM2211CP-REEL7 |
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.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| SSM2211CPZ-R2 | 功能描述:IC AMP AUDIO PWR 1W MONO 8LFCSP RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻放大器 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:DirectDrive® 類型:H 類 輸出類型:耳機，2-通道（立體聲） 在某負載時最大輸出功率 x 通道數(shù)量:35mW x 2 @ 16 歐姆 電源電壓:1.62 V ~ 1.98 V 特點:I²C，麥克風，靜音，短路保護，音量控制 安裝類型:表面貼裝 供應商設備封裝:25-WLP（2.09x2.09） 封裝/外殼:25-WFBGA，WLCSP 包裝:帶卷 (TR) |
| SSM2211CPZ-R21 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Distortion, 1.5 W Audio Power Amplifier |
| SSM2211CPZ-REEL | 功能描述:IC AMP AUDIO PWR 1W MONO 8LFCSP RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻放大器 系列:- 標準包裝:2,000 系列:- 類型:AB 類 輸出類型:2 通道（立體聲） 在某負載時最大輸出功率 x 通道數(shù)量:- 電源電壓:4 V ~ 18 V 特點:- 安裝類型:通孔 供應商設備封裝:8-DIP 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 |
| SSM2211CPZ-REEL1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Distortion, 1.5 W Audio Power Amplifier |
| SSM2211CPZ-REEL7 | 功能描述:IC AMP AUDIO PWR 1W MONO 8LFCSP RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻放大器 系列:- 標準包裝:2,000 系列:- 類型:AB 類 輸出類型:2 通道（立體聲） 在某負載時最大輸出功率 x 通道數(shù)量:- 電源電壓:4 V ~ 18 V 特點:- 安裝類型:通孔 供應商設備封裝:8-DIP 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 |
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