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LM4731 Datasheet(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM4731
Description  Stereo 25W Audio Power Amplifier with Mute and Standby Modes
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM4731 Datasheet(HTML) 4 Page - National Semiconductor (TI)

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Electrical Characteristics (Notes 1, 2) (Continued)
The following specifications apply for V
+ = +22V, V- = −22V and R
L =8
Ω unless otherwise specified. Limits apply for T
A =
(Note 6)
(Notes 7, 8)
Mute Low Input Voltage
Not in Mute Mode (Play)
V (max)
Mute High Input Voltage
In Mute Mode
V (min)
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 a device’s performance.
Note 3: The maximum power dissipation must be de-rated at elevated temperatures and is dictated by TJMAX, θJC, and the ambient temperature TA. The maximum
allowable power dissipation is PDMAX =(TJMAX -TA)/ θJC or the number given in the Absolute Maximum Ratings, whichever is lower. For the LM4731, TJMAX = 150˚C
and the typical
θJC is 1.5˚C/W for the TA15A package . Refer to the Thermal Considerations section for more information.
Note 4: Human body model, 100 pF discharged through a 1.5 k
Ω resistor.
Note 5: Machine Model: a 220pF - 240pF discharged through all pins.
Note 6: Typical specifications are sepcified 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 operating junction temperature maximum is 150˚C. However, the instantaneous Safe Operating Area temperature is 250˚C.
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: The feedback compensation network limits the bandwidth of the closed-loop response causing the skew rate to be reduced by the high frequency roll-off.
Without feedback compensation the slew rate is typically larger.
Note 12: The LM4731TA package TA15A is a non-isolated package setting the tab of the device and the heat sink to V-potential when the LM4731TA is directly
mounted to the heat sink using only thermal compound. If a mica washer is used in addition to thermal compound,
θCS (case to sink) is increased, but the heat sink
will be electrically isolated from V-.
Bridged Amplifier Application Circuit
FIGURE 2. Bridged Amplifier Application Circuit

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