參數(shù)資料
型號(hào)： TPA0122PWPRG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 音頻控制
英文描述： 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO24
封裝： GREEN, PLASTIC, HTSSOP-24
文件頁(yè)數(shù)： 20/33頁(yè)
文件大小： 688K
代理商： TPA0122PWPRG4
www.ti.com
P
Dmax +
2V2
DD
p 2
R
L
(11)
Θ
JA +
1
Derating Factor
+
1
0.022
+ 45
°C W
(12)
T
A Max + TJ Max * ΘJA PD
+ 150 * 45(0.6
2) + 96°C (15 * dB crest factor)
(13)
SE/BTL OPERATION
TPA0122
SLOS247C – JUNE 1999 – REVISED SEPTEMBER 2004
Table 5. TPA0122 Power Rating, 5-V, 8-
Stereo
POWER DISSIPATION
MAXIMUM AMBIENT
PEAK OUTPUT POWER
AVERAGE OUTPUT POWER
(W/Channel)
TEMPERATURE(1)
2.5 W
1250 mW (3-dB crest factor)
0.55
85
°C
2.5 W
1000 mW (4-dB crest factor)
0.62
85
°C
2.5 W
500 mW (7-dB crest factor)
0.59
85
°C
2.5 W
250 mW (10-dB crest factor)
0.53
85
°C
(1)
Package limited to 85
°C ambient.
The maximum dissipated power, PDmax, is reached at a much lower output power level for a 3- load than for an
8-
load. As a result, this simple formula for calculating P
Dmax may be used for a 3- application:
However, in the case of an 8-
load, the P
Dmax 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 8-
load, but do not exceed the maximum ambient temperature of 85°C.
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. Converting this to
θ
JA:
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
θ
JA, 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 TPA0122 is
150
°C. The internal dissipation figures are taken from the Power Dissipation vs Output Power graphs.
NOTE:
Internal dissipation of 0.6 W is estimated for a 2-W system with 15-dB crest factor per
channel. Due to package limitations, the actual TA Max is 85°C.
Table 4 and Table 5 show that for some applications no airflow is required to keep junction temperatures in the
specified range. The TPA0122 is designed with thermal protection that turns the device off when the junction
temperature surpasses 150
°C to prevent damage to the IC. Table 4 and Table 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-
speakers dramatically increases the thermal performance by increasing amplifier
efficiency.
The ability of the TPA0122 to easily switch between BTL and SE modes is one of its most important cost-saving
features. This feature eliminates the requirement for an additional headphone amplifier in applications where
internal stereo speakers are driven in BTL mode but external headphone or speakers must be accommodated.
Internal to the TPA0122, two separate amplifiers drive OUT+ and OUT–. The SE/BTL input (terminal 15) controls
the operation of the follower amplifier that drives LOUT- and ROUT– (terminals 9 and 16). When SE/BTL is held
low, the amplifier is on and the TPA0122 is in the BTL mode. When SE/BTL is held high, the OUT– amplifiers
are in a high output impedance state, which configures the TPA0122 as an SE driver from LOUT+ and ROUT+
(terminals 4 and 21). IDD is reduced by approximately one-half in SE mode. Control of the SE/BTL input can be
from a logic-level CMOS source or, more typically, from a resistor divider network as shown in Figure 47.
27
相關(guān)PDF資料
PDF描述
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TPA0132PWPG4 功能描述:音頻放大器 2W Stereo APA With DC Volume Control RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
TPA0132PWPR 功能描述:音頻放大器 2W Stereo APA With DC Volume Control RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
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