lm4995tmx National Semiconductor Corporation, lm4995tmx Datasheet - Page 5

• Manufacturer Part Number: lm4995tmx
• Description: Boomer-r Audio Power Amplifier Series1.3 W Audio Power Amplifier
• Manufacturer: National Semiconductor Corporation

I
I
V
P
T
THD+N
PSRR
V
V
DD
SD
Symbol
WU
OS
o
SDIH
SDIL
Electrical Characteristics V
The following specifications apply for the circuit shown in Figure 1, unless otherwise specified. Limits apply for T
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 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 derated at elevated temperatures and is dictated by T
allowable power dissipation is P
curves for additional information.
Note 4: Human body model, 100pF discharged through a 1.5kΩ resistor.
Note 5: Machine Model, 220pF–240pF discharged through all pins.
Note 6: Typicals are measured at 25°C and represent the parametric norm.
Note 7: 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: R
Note 10: If the product is in Shutdown mode and V
circuits. If the source impedance limits the current to a max of 10mA, then the device will be protected. If the device is enabled when V
and less than 6.5V, no damage will occur, although operation life will be reduced. Operation above 6.5V with no current limit will result in permanent damage.
Note 11: Maximum power dissipation in the device (P
Equation 1 shown in the Application Information section. It may also be obtained from the power dissipation graphs.
External Components Description
(Figure 1)
Components
1.
2.
3.
4.
5.
OUT
Quiescent Power Supply Current
Shutdown Current
Output Offset Voltage
Output Power
Wake-up time
Total Harmonic Distortion + Noise
Power Supply Rejection Ratio
Shutdown Voltage Input High
Shutdown Voltage Input Low
C
C
R
R
C
is measured from the output pin to ground. This value represents the parallel combination of the 10kΩ output resistors and the two 20kΩ resistors.
S
B
i
i
f
Inverting input resistance which sets the closed-loop gain in conjunction with R
pass filter with C
Input coupling capacitor which blocks the DC voltage at the amplifiers input terminals. Also creates a highpass filter
with R
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
Parameter
i
at f
DMAX
C
= (T
= 1/(2π R
JMAX
i
at f
–T
C
A
)/θ
i
= 1/(2π R
C
DD
i
JA
). Refer to the section, Proper Selection of External Components, for an explanation of
or the number given in Absolute Maximum Ratings, whichever is lower. For the LM4995, see power derating
DMAX
exceeds 6V (to a max of 8V V
DD
) occurs at an output power level significantly below full output power. P
V
V
V
No Load
THD+N = 1% (max); f = 1 kHz
P
V
Input terminated to GND
i
C
i
IN
IN
SD
o
ripple
.
= 3.0V
i
= 250mW
).
= 0V, I
= 0V, I
= V
= 200mV sine p-p
GND
o
o
= 0A, No Load
= 0A, 8Ω Load
Conditions
RMS
Functional Description
(Notes 1, 2)
5
; f = 1kHz
DD
), then most of the excess current will flow through the ESD protection
JMAX
, θ
74 (f = 217Hz)
75 (f = 1kHz)
JA
, and the ambient temperature T
(Note 6)
Typical
i
0.01
0.07
.
400
110
1.3
1.6
1.2
5
1
B
f
. This resistor also forms a high
.
LM4995
(Notes 7, 8)
DMAX
Limit
DD
can be calculated using
is greater than 5.5V
A
= 25°C.
A
. The maximum
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(Limits)
Units
mW
mA
mA
mV
µA
ms
dB
%
V
V