LM4873MT National Semiconductor, LM4873MT Datasheet - Page 6

• Manufacturer Part Number: LM4873MT
• Description: Dual 2.1W Audio Amplifier Plus Stereo Headphone Function
• Manufacturer: National Semiconductor

www.national.com
External Components Description
Typical Performance Characteristics
MTE (20 pin)Specific Characteristics
LM4873MTE
THD+N vs Output Power
LM4873MTE
THD+N vs Frequency
Note 20: These curves show the thermal dissipation ability of the LM4873MTE at different ambient temperatures given these conditions:
it. Board information - copper dimensions: 74x74mm, copper coverage: 100% (buried layer) and 12% (top/bottom layers), 16 vias under the exposed-DAP.
Components
( Figure 1 )
1.
2.
3.
4.
5.
500LFPM + JEDEC board: The part is soldered to a 1S2P 20-lead exposed-DAP TSSOP test board with 500 linear feet per minute of forced-air flow across
500LFPM + 2.5in
2.5in
Not Attached: The part is not soldered down and is not forced-air cooled.
2
: The part is soldered to a 2.5in
C
C
R
R
C
B
s
i
i
f
2
: The part is soldered to a 2.5in
Inverting input resistance which sets the closed-loop gain in conjunction with R
high pass filter with C
Input coupling capacitor which blocks the DC voltage at the amplifier’s input terminals. Also creates a
highpass filter with R
for an explanation of how to determine the value of C
Feedback resistance which sets the closed-loop gain in conjunction with R
Supply bypass capacitor which provides power supply filtering. Refer to the Power Supply Bypassing
section for information concerning proper placement and selection of the supply bypass capacitor.
Bypass pin capacitor which provides half-supply filtering. Refer to the section, Proper Selection of
External Components, for information concerning proper placement and selection of C
DS100993-36
2
, 1oz. copper plane.
DS100993-33
i
at f
i
2
at f
, 1 oz. copper plane with 500 linear feet per minute of forced-air flow across it.
LM4873MTE
Power Dissipation vs Power Output
c
c
= 1/(2 R
= 1/(2 R
i
C
i
C
i
). Refer to the section, Proper Selection of External Components,
i
).
Functional Description
LM4873MTE
THD+N vs Frequency
6
DS100993-90
i
.
LM4873MTE(Note 20)
Power Derating Curve
i
.
f
. This resistor also forms a
DS100993-34
B
.
DS100993-95