參數(shù)資料
型號(hào)： TPA751GQS
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 音頻／視頻放大
英文描述： 0.7 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA24
封裝： 3 X3 MM, PLASTIC, BGA-24
文件頁(yè)數(shù)： 11/32頁(yè)
文件大?。?/td> 910K
代理商： TPA751GQS
TPA751
700mW MONO LOW VOLTAGE AUDIO POWER AMPLIFIER
WITH DIFFERENTIAL INPUTS
SLOS336C DECEMBER 2000 REVISED OCTOBER 2002
19
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
headroom and thermal considerations
Linear power amplifiers dissipate a significant amount of heat in the package under normal operating conditions.
A typical music CD requires 12 dB to 15 dB of dynamic headroom to pass the loudest portions without distortion
as compared with the average power output. From the TPA751 data sheet, one can see that when the TPA751
is operating from a 5-V supply into an 8-
speaker that 700 mW peaks are available. Converting watts to dB:
P
dB +
10 Log
P
W
P
ref
+ 10Log 700 mW
1W
+ –1.5 dB
Subtracting the headroom restriction to obtain the average listening level without distortion yields:
1.5 dB 15 dB = 16.5 (15 dB headroom)
1.5 dB 12 dB = 13.5 (12 dB headroom)
1.5 dB 9 dB = 10.5 (9 dB headroom)
1.5 dB 6 dB = 7.5 (6 dB headroom)
1.5 dB 3 dB = 4.5 (3 dB headroom)
Converting dB back into watts:
P
W + 10
PdB 10 xP
ref
= 22 mW (15 dB headroom)
= 44 mW (12 dB headroom)
= 88 mW (9 dB headroom)
= 175 mW (6 dB headroom)
= 350 mW (3 dB headroom)
This is valuable information to consider when attempting to estimate the heat dissipation requirements for the
amplifier system. Comparing the absolute worst case, which is 700 mW of continuous power output with 0 dB
of headroom, against 12 dB and 15 dB applications drastically affects maximum ambient temperature ratings
for the system. Using the power dissipation curves for a 5-V, 8-
system, the internal dissipation in the TPA751
and maximum ambient temperatures is shown in Table 1.
Table 1. TPA751 Power Rating, 5-V, 8-
, BTL
PEAK OUTPUT
POWER
AVERAGE
POWER
DISSIPATION
D PACKAGE
(SOIC)
DGN PACKAGE
(MSOP)
GQS PACKAGE
(MicroStar Junior
)
POWER
(mW)
AVERAGE
OUTPUT POWER
DISSIPATION
(mW)
MAXIMUM AMBIENT
TEMPERATURE
MAXIMUM AMBIENT
TEMPERATURE
MAXIMUM AMBIENT
TEMPERATURE
700
700 mW
675
34
°C
110
°C
99
°C
700
350 mW (3 dB)
595
47
°C
115
°C
105
°C
700
176 mW (6 dB)
475
68
°C
122
°C
114
°C
700
88 mW (9 dB)
350
89
°C
125
°C
123
°C
700
44 mW (12 dB)
225
111
°C
125
°C
125
°C
Table 1 shows that the TPA751 can be used to its full 700-mW rating without any heat sinking in still air up to
110
°C, 34°C, and 99°C for the DGN package (MSOP), D package (SOIC), and GQS (MicroStar Junior)
package, respectively.
相關(guān)PDF資料
PDF描述
TPD12S521DBTR SPECIALTY CONSUMER CIRCUIT, PDSO38
TPD12S521DBTRG4 SPECIALTY CONSUMER CIRCUIT, PDSO38
TPD4104AKLBR BRUSHLESS DC MOTOR CONTROLLER, 3 A, PZFM23
TPD4104AKLBF BRUSHLESS DC MOTOR CONTROLLER, 3 A, PZFM23
TPD4104KLBF BRUSHLESS DC MOTOR CONTROLLER, 3 A, PZFM23
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPA751GQSR 功能描述:音頻放大器 Mono Diff Input Class-AB RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類(lèi)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
TPA77930DGK 制造商:Rochester Electronics LLC 功能描述:- Bulk
TPA-B-20 功能描述:保險(xiǎn)絲 TELPOWER ALARM FUSE RoHS:否 制造商:Littelfuse 產(chǎn)品:Surface Mount Fuses 電流額定值:0.5 A 電壓額定值:600 V 保險(xiǎn)絲類(lèi)型:Fast Acting 保險(xiǎn)絲大小/組:Nano 尺寸:12.1 mm L x 4.5 mm W 安裝風(fēng)格: 端接類(lèi)型:SMD/SMT 系列:485
TPA-B-25 功能描述:保險(xiǎn)絲 TELPOWER ALARM FUSE RoHS:否 制造商:Littelfuse 產(chǎn)品:Surface Mount Fuses 電流額定值:0.5 A 電壓額定值:600 V 保險(xiǎn)絲類(lèi)型:Fast Acting 保險(xiǎn)絲大小/組:Nano 尺寸:12.1 mm L x 4.5 mm W 安裝風(fēng)格: 端接類(lèi)型:SMD/SMT 系列:485
TPA-B-30 功能描述:保險(xiǎn)絲 TELPOWER ALARM FUSE RoHS:否 制造商:Littelfuse 產(chǎn)品:Surface Mount Fuses 電流額定值:0.5 A 電壓額定值:600 V 保險(xiǎn)絲類(lèi)型:Fast Acting 保險(xiǎn)絲大小/組:Nano 尺寸:12.1 mm L x 4.5 mm W 安裝風(fēng)格: 端接類(lèi)型:SMD/SMT 系列:485
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*