LM4781TA/NOPB National Semiconductor, LM4781TA/NOPB Datasheet - Page 4

• Manufacturer Part Number: LM4781TA/NOPB
• Description: IC AMP AUDIO PWR 35W AB TO220-27
• Manufacturer: National Semiconductor
• Series: Overture™r
• Type: Class ABr

Specifications of LM4781TA/NOPB

• Output Type: 3-Channel
• Max Output Power X Channels @ Load: 35W x 3 @ 8 Ohm
• Voltage - Supply: 20 V ~ 70 V, ±10 V ~ 35 V
• Features: Depop, Mute, Short-Circuit and Thermal Protection
• Mounting Type: Through Hole
• Package / Case: TO-220-27 (Bent and Staggered Leads)
• For Use With: LM4781TABD - BOARD EVALUATION LM4781TA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: *LM4781TA; *LM4781TA/NOPB; LM4781TA

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CMRR
A
GBWP
e
SNR
IMD
IN
VOL
Electrical Characteristics
The following specifications apply for V
Limits apply for T
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 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: The maximum power dissipation must be de-rated at elevated temperatures and is dictated by T
allowable power dissipation is P
and the typical θ
Note 4: Human body model, 100pF discharged through a 1.5kΩ resistor.
Note 5: Machine Model: a 220pF - 240pF discharged through all pins.
Note 6: Typical specifications are measured at 25˚C 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 150˚C. However, the instantaneous Safe Operating Area temperature is 250˚C.
Note 10: V
differential between V
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
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
only thermal compound. If a mica washer is used in addition to thermal compound, θ
V
Note 15: DC electrical test.
-
Symbol
.
-
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
JC
Common Mode Rejection Ratio
(Note 15)
Open Loop Voltage Gain
Gain Bandwidth Product
Input Noise
Signal-to-Noise Ratio
Intermodulation Distortion
is 0.9˚C/W. Refer to the DETERMINING THE CORRECT HEAT SINK section for more information.
+
A
and V
= 25˚C.
-
must be greater than 14V.
DMAX
Parameter
= (T
JMAX
-T
A
+
)/θ
= +28V, V
JC
(Notes 1, 2) (Continued)
or the number given in the Absolute Maximum Ratings, whichever is lower. For the LM4781, T
V
V
|V
∆V
|V
V
IHF-A-Weighting Filter,
R
P
f
P
f
60Hz, 7kHz, 4:1 (SMPTE)
60Hz, 7kHz, 1:1 (SMPTE)
IN
IN
+
CM
IN
O
O
IN
+
+
O
| = |V
| = |V
= 1kHz, R
= 1kHz, R
= 30V to 10V, V
-
= 1W
= 25W
= 50mV
= 600Ω (Input Referred)
= −28V, I
= 20V to -20V, I
= 20V
-
-
RMS
| = 28V, R
| = 28V, f
RMS
RMS
; A-Weighted Filter
S
S
MUTE
; A-Weighted Filter
4
= 25Ω
= 25Ω
Conditions
CS
IN
L
-
(case to sink) is increased, but the heat sink will be electrically isolated from
= -1mA/channel and R
= -10V to -30V
= 100kHz
O
= 2kΩ
= 0mA
+
= 30V and V
JMAX
, θ
JC
-
, and the ambient temperature T
= - 30V.
L
(Note 6) (Notes 7, 8)
Typical
= 8Ω unless otherwise specified.
0.004
0.006
110
115
107
3.0
93
8
LM4781
Limit
75
80
2
8
-
potential when using
A
. The maximum
JMAX
MHz (min)
µV (max)
dB (min)
dB (min)
(Limits)
Units
= 150˚C
dB
dB
%
%