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参数资料
| 型号： | TDA8944AJ |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 7 W, 2 CHANNEL, AUDIO AMPLIFIER, PZIP17 |
| 封装： | PLASTIC, DIL-BENT-SIL, 17 PIN |
| 文件页数： | 18/20页 |
| 文件大小： | 376K |
| 代理商： | TDA8944AJ |
Philips Semiconductors
TDA8944AJ
2 x 7 W BTL audio amplier with DC gain control
Product data
Rev. 01 — 01 March 2002
7 of 20
9397 750 09433
Koninklijke Philips Electronics N.V. 2002. All rights reserved.
8.6 Built-in protection circuits
The TDA8944AJ contains two types of protection circuits, i.e. short-circuit and
thermal shutdown.
8.6.1
Short-circuit protection
Short-circuit to ground or supply line — This is detected by a so-called ‘missing
current’ detection circuit which measures the current in the positive supply line and
the current in the ground line. A difference between both currents larger than 0.8 A,
switches the power stage to the standby mode; high impedance of the outputs and
very low supply current.
Short-circuit across the load — This is detected by an absolute-current
measurement. An absolute-current larger than 2 A, switches the power stage to
standby mode; high impedance of the outputs and a very low supply current.
8.6.2
Thermal shutdown protection
The junction temperature is measured by a temperature sensor; at a junction
temperature of approximately 150
°C this detection circuit switches the power stage
to the standby mode; high impedance of the outputs and very low supply current.
9.
Limiting values
10. Thermal characteristics
Table 5:
Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol
Parameter
Conditions
Min
Max
Unit
VCC
supply voltage
no signal
0.3
+25
V
operating
0.3
+18
V
VI
input voltage
0.3
VCC + 0.3
V
IORM
repetitive peak output current
-
2
A
Tstg
storage temperature
non-operating
55
+150
°C
Tamb
operating ambient temperature
40
+85
°C
Ptot
total power dissipation
-
18
W
VCC(sc)
supply voltage to guarantee short-circuit
protection
-15
V
Table 6:
Thermal characteristics
Symbol
Parameter
Conditions
Value
Unit
Rth(j-a)
thermal resistance from junction to ambient
in free air
40
K/W
Rth(j-mb)
thermal resistance from junction to mounting base both channels driven
4.5
K/W
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| TDA8944AJ/N2,112 | 功能描述:音频放大器 2X6W AUDIO AMP. + VOL. CONTROL RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
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| TDA8944J/N1 | 制造商:NXP Semiconductors 功能描述:AMP AUDIO PWR 7W STER 17SIL |
| TDA8944J/N1,112 | 功能描述:音频放大器 7 WATT STEREO AMP RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TDA8944J/N1112 | 制造商:NXP Semiconductors 功能描述:IC AUDIO AMP AB 7W SIP-17 |
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