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TPA0112 Datasheet(PDF) 29 Page - Texas Instruments

Part # TPA0112
Description  2-W STEREO AUDIO POWER AMPLIFIER WITH FOUR SELECTABLE GAIN SETTINGS
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TPA0112 Datasheet(HTML) 29 Page - Texas Instruments

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TPA0112
2-W STEREO AUDIO POWER AMPLIFIER
WITH FOUR SELECTABLE GAIN SETTINGS
SLOS204B – MAY 1999 – REVISED MARCH 2000
29
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
crest factor and thermal considerations (continued)
Table 5. TPA0112 Power Rating, 5-V, 8-
Ω, Stereo
PEAK OUTPUT POWER
AVERAGE OUTPUT POWER
POWER DISSIPATION
(W/Channel)
MAXIMUM AMBIENT
TEMPERATURE
2.5 W
1250 mW (3 dB crest factor)
0.55
100
°C
2.5 W
1000 mW (4 dB crest factor)
0.62
94
°C
2.5 W
500 mW (7 dB crest factor)
0.59
97
°C
2.5 W
250 mW (10 dB crest factor)
0.53
102
°C
The maximum dissipated power, PDmax, is reached at a much lower output power level for an 8 Ω load than for
a 3
Ω load. As a result, this simple formula for calculating PDmax may be used for an 8 Ω application:
P
Dmax +
2V2
DD
p2R
L
(11)
However, in the case of a 3
Ω load, the PDmax occurs at a point well above the normal operating power level.
The amplifier may therefore be operated at a higher ambient temperature than required by the PDmax formula
for a 3
Ω load.
The maximum ambient temperature depends on the heat sinking ability of the PCB system. The derating factor
for the PWP package is shown in the dissipation rating table (see page 4). Converting this to
ΘJA:
Θ
JA +
1
Derating Factor
+
1
0.022
+ 45°C W
(12)
To calculate maximum ambient temperatures, first consider that the numbers from the dissipation graphs are
per channel so the dissipated power needs to be doubled for two channel operation. Given
ΘJA, the maximum
allowable junction temperature, and the total internal dissipation, the maximum ambient temperature can be
calculated with the following equation. The maximum recommended junction temperature for the TPA0112 is
150
°C. The internal dissipation figures are taken from the Power Dissipation vs Output Power graphs.
T
A Max + TJ Max * ΘJA PD
+ 150 * 45(0.6
2)
+ 96°C (15 dB crest factor)
(13)
NOTE:
Internal dissipation of 0.6 W is estimated for a 2-W system with 15 dB crest factor per channel.
Tables 4 and 5 show that for some applications no airflow is required to keep junction temperatures in the
specified range. The TPA0112 is designed with thermal protection that turns the device off when the junction
temperature surpasses 150
°C to prevent damage to the IC. Tables 4 and 5 were calculated for maximum
listening volume without distortion. When the output level is reduced the numbers in the table change
significantly. Also, using 8-
Ω speakers dramatically increases the thermal performance by increasing amplifier
efficiency.


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