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參數(shù)資料
| 型號： | LM4781TA |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | Overture⑩ Audio Power Amplifier Series 3 Channel 35W Audio Power Amplifier with Mute |
| 中文描述： | 35 W, 3 CHANNEL, AUDIO AMPLIFIER, PZFM27 |
| 封裝： | PLASTIC, TO-220, 27 PIN |
| 文件頁數(shù)： | 4/25頁 |
| 文件大小： | 1125K |
| 代理商： | LM4781TA |
Electrical Characteristics
(Notes 1, 2) (Continued)
The following specifications apply for V
+
= +28V, V
-
= 28V, I
MUTE
= -1mA/channel and R
L
= 8
unless otherwise specified.
Limits apply for T
A
= 25C.
Symbol
Parameter
Conditions
LM4781
Units
(Limits)
Typical
(Note 6)
110
Limit
(Notes 7, 8)
75
CMRR
Common Mode Rejection Ratio
(Note 15)
Open Loop Voltage Gain
V
+
= 30V to 10V, V
-
= -10V to -30V
V
CM
= 20V to -20V, I
O
= 0mA
|V
+
| = |V
-
| = 28V, R
L
= 2k
V
O
= 20V
|V
+
| = |V
-
| = 28V, f
IN
= 100kHz
V
IN
= 50mV
RMS
IHF-A-Weighting Filter,
R
IN
= 600
(Input Referred)
P
O
= 1W
RMS
; A-Weighted Filter
f
IN
= 1kHz, R
S
= 25
P
O
= 25W
RMS
; A-Weighted Filter
f
IN
= 1kHz, R
S
= 25
60Hz, 7kHz, 4:1 (SMPTE)
60Hz, 7kHz, 1:1 (SMPTE)
dB (min)
A
VOL
115
80
dB (min)
GBWP
Gain Bandwidth Product
8
2
MHz (min)
e
IN
Input Noise
3.0
8
μV (max)
SNR
Signal-to-Noise Ratio
93
dB
107
dB
IMD
Intermodulation Distortion
0.004
0.006
%
%
Note 1:
All voltages are measured with respect to the ground pins, unless otherwise specified.
Note 2:
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits. Electrical Characteristics state DC andAC 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:
The maximum power dissipation must be de-rated at elevated temperatures and is dictated by T
,
θ
, and the ambient temperature T
. The maximum
allowable power dissipation is P
DMAX
= (T
JMAX
-T
A
)/
θ
JC
or the number given in the Absolute Maximum Ratings, whichever is lower. For the LM4781, T
JMAX
= 150C
and the typical
θ
JC
is 0.9C/W. Refer to the
DETERMINING THE CORRECT HEAT SINK
section for more information.
Note 4:
Human body model, 100pF discharged through a 1.5k
resistor.
Note 5:
Machine Model: a 220pF - 240pF discharged through all pins.
Note 6:
Typical specifications are measured at 25C and represent the parametric norm.
Note 7:
Tested limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 8:
Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.
Note 9:
The maximum operating junction temperature is 150C. However, the instantaneous Safe Operating Area temperature is 250C.
Note 10:
V
-
must have at least - 9V at its pin with reference to GND in order for the under-voltage protection circuitry to be disabled. In addition, the voltage
differential between V
and V
must be greater than 14V.
Note 11:
Cross talk performance was measured using the demo board shown in the datasheet. PCB layout will affect cross talk. It is recommended that the input
and output traces be separated by as much distance as possible. Return ground traces from outputs should also be independent back to sinlge ground point and
use as wide of traces as possible.
Note 12:
The output dropout voltage is the supply voltage minus the clipping voltage. Refer to the Clipping Voltage vs. Supply Voltage graph in the
Typical
Performance Characteristics
section.
Note 13:
The Differential Input Voltage Absolute Maximum Rating is based on supply voltages V
+
= 30V and V
-
= - 30V.
Note 14:
The TA27A is a non-isolated package. The package’s metal back and any heat sink to which it is mounted are connected to the V
-
potential when using
only thermal compound. If a mica washer is used in addition to thermal compound,
θ
CS
(case to sink) is increased, but the heat sink will be electrically isolated from
V
.
Note 15:
DC electrical test.
L
www.national.com
4
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