LM4880_07 [UTC]
DUAL 250mW AUDIO POWER AMPLIFIER WITH SHUTDOWN MODE; 具有关断功能双模双250mW的音频功率放大器型号: | LM4880_07 |
厂家: | Unisonic Technologies |
描述: | DUAL 250mW AUDIO POWER AMPLIFIER WITH SHUTDOWN MODE |
文件: | 总11页 (文件大小:286K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
UNISONIC TECHNOLOGIES CO., LTD
LM4880
CMOS IC
DUAL 250mW AUDIO POWER
AMPLIFIER WITH SHUTDOWN
MODE
DESCRIPTION
The UTC LM4880 is a dual audio power amplifier capable of
delivering typically 250mW per channel of continuous average power
to an 8Ω load with 0.1% THD+N using a 5V power supply.
The UTC LM4880 features an externally controlled, low-power
consumption shutdown mode, as well as an internal thermal
shutdown protection mechanism.
The unity-gain stable UTC LM4880 can be configured by external
gain-setting resistors.
FEATURES
*Pb-free plating product number: LM4880L
* No bootstrap capacitors or snubber circuits are necessary
* Unity-gain stable
* External gain configuration capability
APPLICATIONS
* Personal Computers
* CD-ROM Players
* Headphone Amplifier
ORDERING INFORMATION
Ordering Number
Package
Packing
Normal
Lead Free Plating
LM4880-D08-T
LM4880-SH2-R
LM4880-SH2-T
LM4880L-D08-T
LM4880L-SH2-R
LM4880L-SH2-T
DIP-8
Tube
Tape Reel
Tube
HSOP-8
HSOP-8
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LM4880
CMOS IC
PIN CONFIGURATION
PIN DESCRIPTION
PIN NO
PIN NAME
OUT A
I/O
DESCRIPTION
1
2
3
4
O
I
Channel A output
IN A
Channel A audio input
BYPASS
GND
I
Connect to internal voltage divider for middle supply bias
Ground
Shutdown mode control input, high active, place LM4880 into shutdown
5
SHUTDOWN
I
mode, when held high
Channel B audio input
Channel B output
Supply voltage
6
7
8
IN B
I
OUT B
VDD
O
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LM4880
CMOS IC
ABSOLUTE MAXIMUM RATINGS (Note 2)
PARAMETER
SYMBOL
VDD
RATINGS
6.0
UNIT
Supply Voltage
Input Voltage
V
V
V
V
VIN
-0.3 ~ VDD+0.3
3500
ESD Susceptibility (Note 3)
ESD Susceptibility (Note 4)
Power Dissipation (Note 5)
Junction Temperature
ESD
250
PD
TJ
Internally limited
150
°C
°C
°C
Operating Temperature
Storage Temperature
TOPR
TSTG
-40 ~ +85
-65 ~ +150
Note Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
THERMAL DATA
PARAMETER
SYMBOL
RATINGS
107
UNIT
DIP-8
HSOP-8
DIP-8
Thermal Resistance From Junction to Ambient
Thermal Resistance From Junction to Case
θJA
°C/W
42.3
37
θJC
°C/W
HSOP-8
12
OPERATING RATINGS
PARAMETER
SYMBOL
VDD
RATINGS
2.7 ~ 5.5
-40 ~ +85
UNIT
V
Supply Voltage
Temperature Range (TMIN≤Ta≤TMAX
)
Ta
°C
ELECTRICAL CHARACTERISTICS (Note 1,2)
(Ta=25°C , The following specifications apply for VDD=5V, f=1kHz unless otherwise specified)
PARAMETER
Supply Voltage
SYMBOL
VDD
TEST CONDITIONS
VIN=0V, IOUT=0A
MIN
2.7
TYP
MAX UNIT
5.5
6.0
5
V
Quiescent Power Supply Current
Shutdown Current
IDD
3.6
0.7
5
mA
µA
ISHDN
VPIN5=VDD
Output Offset Voltage
VO(OFF)
VIN=0V
50
mV
mW
mW
mW
mW
%
THD=0.1%(max) RL=8Ω
200
250
85
, f=1KHz
RL=32Ω
RL=8Ω
RL=32Ω
Output Power
POUT
THD+N=10%,
f=1KHz
325
110
0.03
0.02
RL=8Ω, POUT=200mW, f=1KHz
RL=32Ω, POUT=75mW, f=1KHz
Cb=1.0µF
Total Harmonic Distortion + Noise
Power Supply Rejection Ratio
THD+N
PSRR
%
50
dB
VRIPPLE=200mVrms, f=100Hz
Note 1: All voltages are measured with respect to the ground pin, unless otherwise specified.
Note 2: Absolute Maximum Ratings indicate limits beyond which damage may occur. Operating ratings indicate
conditions for which the device is functional, but do not guarantee specific performance limits. Electrical
Characteristics state DC and AC electrical specifications under particular test conditions which guarantee
specific performance limits. This assumes that the device is within the operating ratings. Specifications are
not guaranteed for parameters where no limit is given, however, the typical value is a good indication of
device performance.
Note 3: Human body model, 100 pF discharged through a 1.5 kΩ resistor.
Note 4: Machine model, 220 pF ~ 240 pF discharged through all pins.
Note 5: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJMAX, θJA,
and the ambient temperature TA. The maximum allowable power dissipation is PDMAX = (TJMAX - TA) /θJA or the
number given in the Absolute Maximum Ratings, whichever is lower. For the UTC LM4880, TJMAX = 15℃, and
the typical junction-to-ambient thermal resistance is 170℃/W for SOP-8 package and 107℃/W for DIP-8
package.
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LM4880
CMOS IC
TYPICAL APPLICATION
VDD
+
CS
0.1 F
RF
20k
μ
Ω
Audio
Input
8
*Ci
2
IN A
+
*Co
+
-
OUT A
1
Ri
20k
+
Ω
L
Ω
Ω
R
15k
Ω
50k
Ω
8
or
32
VDD/2
Shutdown
Bypass
5
3
Bias
+
CB
50k
Ω
1.0
F
μ
*Co
+
Audio
Input
+
-
Ri
7
OUT B
*Ci
Ω
20k
IN B
6
+
RL
15k
Ω
8
Ω
or
32
Ω
RF
20k
Ω
GND
4
Figure 1.Typical Audio Amplifier Application Circuit
EXTERNAL COMPONENTS DESCRIPTION (Figure 1)
COMPONENTS FUNCTIONAL DESCRIPTION
Inverting input resistance which sets the closed-loop gain in conjunction with RF. This resistor
also forms a high pass filter with Ci at fc = 1/(2πRiCi).
1.
2.
Ri
Ci
Input coupling capacitor which blocks the DC voltage at the amplifier’s input terminals. Also
creates a high pass filter with Ri at fc = 1/(2πRiCi).
3.
4.
5.
RF
Cs
CB
Feedback resistance which sets closed-loop gain in conjunction with Ri.
Supply bypass capacitor which provides power supply filtering.
Bypass pin capacitor which provides half-supply filtering.
Output coupling capacitor which blocks the DC voltage at the amplifier’s output. Forms a high
pass filter with RL at fo = 1/(2πRLCo).
6.
CO
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LM4880
CMOS IC
AUTOMATIC SHUTDOWN CIRCUIT
VDD
20kΩ
0.1μF
AUDIO
INPUT
HEADPHONE JACK
2
3
8
+
-
100μF
UTC
1
+
0.33μF 20kΩ
LM4880
5
RO
1kΩ
Rp
1MΩ
VDD
+
4
+
Rsd
100kΩ
1μF
TO CHANNEL B
OUTPUT(PIN 7)
VIA COUPLING
CAPACITOR
Figure 2. Automatic Shutdown Circuit
AUTOMATIC SWITCHING CIRCUIT
VDD
20kΩ
AUDIO
INPUT
0.1μF
HEADPHONE JACK
20kΩ
2
3
8
+
100µF
+
-
UTC
1
0.33μF
LM4880
VDD
5
RO
1kΩ
+
4
+
Rp
1MΩ
1μF
Rsd
100kΩ
TO UTC LM4880
CHANNEL B OUTPUT
(PIN 7) VIA COUPLING
CAPACITOR
20kΩ
V DD
0.1µF
6
-
20kΩ
4
3
+
5
RL
8Ω
LM4861
0.33μF
8
+
+
1
7
1μF
2
Figure 3.Automatic Switching Circuit
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LM4880
CMOS IC
TYPICAL CHARACTERISTICS
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LM4880
CMOS IC
TYPICAL CHARACTERISTICS(Cont.)
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LM4880
CMOS IC
TYPICAL CHARACTERISTICS(Cont.)
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LM4880
CMOS IC
TYPICAL CHARACTERISTICS(Cont.)
Channel Separation
Output Attenuatin in Shutdown Mode
0.0
-20.00
-40.00
-60.00
0.0
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
100.0
RL=8Ω
0dB=1.3Vrms
RL=8Ω
VDD =5.0V
VPIN3=5.0V
POUT =200mW
0dB=200mW
GV=1
CB=1.0μF
Channel B to A
Channel A to B
Ri=RF=10kΩ
-80.00
-100.0
-120.0
-140.0
Ri=10kΩ
RF =20kΩ
Ri=RF=20KΩ
20
1k
10k 20k
100
20
100
1k
Frequency (Hz)
10k 20k
Frequency (Hz)
Noise Floor
Power Supply Rejection Ratio
VPIN3=2.5V(FORCED)
1m
100μ
10μ
1μ
70
RL=8Ω
GV=1
BW<22kHz
60
50
40
30
20
VDD=5.0V
VRIPPLE
=200mVrms
10
0
0dB=200mVrms
CB=0.1μF
Ω
RL=8
10k 20k
10
100
1k
Frequency (Hz)
10k
100k
20
100
1k
Frequency (Hz)
Open Loop Frequency Response
Supply Current vs Supply Voltage
22
5
100
80
60
40
20
0
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
VPIN5 =0V
RL
=
180
135
90
Gain
Phase
45
0
3.0
10
100
1k
10k 100k 1M 10M 100M
2.5
3.5
4.0
4.5
5.0
5.5
Frequency (Hz)
Supply Voltage (V)
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LM4880
CMOS IC
TYPICAL CHARACTERISTICS(Cont.)
Frequency Response vs. Output Capacitor Size
Frequency Response vs. Output Capacitor Size
5.0000
5.0000
GV =-1, Ci=10μF
GV =-1, Ci =10μF
Ri=20k RL =8Ω
Ri=20k RL=32Ω
Ω,
Ω,
0.0
-5.000
-10.00
-15.00
-20.00
0.0
-5.000
-10.00
-15.00
-20.00
μ
Co=220
F
μ
Co=47 F
μ
Co=470
μ
F
Co=100
F
μ
Co=220
F
μ
Co=1000
F
μ
Co=470
F
μ
F
Co=2200
20
100
1k
Frequency (Hz)
10k
100k
20
100
1k
Frequency (Hz)
10k
100k
Frequency Response vs Input Capacitor Size
Typical Application Frequency Response
5.0000
0.0
5.0000
0.0
i
μ
Ci=0.1
F
μ
Ci=0.1
F
μ
Co=470
F
-5.000
-5.000
-10.00
-15.00
-20.00
μ
Ci=0.22
F
μ
Ci=0.47
F
μ
Ci=1.0 F
-10.00
-15.00
-20.00
μ
Co=470
F
μ
Ci=1.0
F
Gv=-1
Ri=20kΩ
Gv=-1
Ω
Ri=20k
μ
CoUT=10000
RL=8
F
Ω
RL=8
Ω
100
1k
100
1k
20
10k
100k
20
10k
100k
Frequency (Hz)
Frequency (Hz)
Typical Application Frequency Response
5.0000
0.0
μ
Ci=1.0
Co=220
F
μ
-5.000
-10.00
-15.00
-20.00
F
μ
Ci=0.1
F
μ
Co=220
F
Gv=-1
Ri=20k
RL=32Ω
Ω
10k
100k
20
100
1k
Frequency (Hz)
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LM4880
CMOS IC
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
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