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参数资料
| 型号： | TDA7056AT/N2 |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 音频控制 |
| 英文描述： | 1 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO20 |
| 封装： | PLASTIC, SOT-163, SO-20 |
| 文件页数： | 18/22页 |
| 文件大小： | 164K |
| 代理商： | TDA7056AT/N2 |
1998 Feb 23
5
Philips Semiconductors
Product specication
3 W mono BTL audio amplier with DC
volume control
TDA7056AT
FUNCTIONAL DESCRIPTION
The TDA7056AT is a mono BTL output amplifier with DC
volume control. It is designed for use in TVs and monitors
but is also suitable for battery-fed portable recorders and
radios.
In conventional DC volume circuits the control or input
stage is AC-coupled to the output stage via external
capacitors to keep the offset voltage low. In the
TDA7056AT the DC volume control stage is integrated into
the input stage so that no coupling capacitors are required.
With this configuration, a low offset voltage is still
maintained and the minimum supply voltage remains low.
The BTL principle offers the following advantages:
Lower peak value of the supply current
The frequency of the ripple on the supply voltage is twice
the signal frequency.
Consequently, a reduced power supply with smaller
capacitors can be used which also results in cost
reductions. For portable applications there is a trend to
decrease the supply voltage, resulting in a reduction of
output power at conventional output stages. Using the BTL
principle increases the output power.
The maximum gain of the amplifier is fixed at 35.5 dB.
The DC volume control stage has a logarithmic control
characteristic.
The total gain can be controlled from +35.5 to
44 dB.
If the DC volume control voltage is below 0.3 V, the device
switches to the mute mode.
The amplifier is short-circuit proof to ground, VP and
across the load. A thermal protection circuit is also
implemented. If the crystal temperature rises above
+150
°C the gain will be reduced, thereby reducing the
output power. Special attention is given to switch-on and
switch-off clicks, low HF radiation and a good overall
stability.
Power dissipation
Assume VP = 12 V; RL =16 .
The maximum sine wave dissipation is 1.8 W.
The Rth vj-a of the package is 60 K/W.
Therefore Tamb(max) = 150 60 × 1.8=42 °C.
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
THERMAL CHARACTERISTICS
SYMBOL
PARAMETER
CONDITIONS
MIN.
MAX.
UNIT
VP
supply voltage
18
V
V5, 7
input voltage pins 5 and 7
5V
IORM
repetitive peak output current
1.25
A
IOSM
non-repetitive peak output current
1.5
A
Ptot
total power dissipation
Tcase < 60 °C
1.5
W
Tamb
operating ambient temperature
40
+85
°C
Tstg
storage temperature
55
+150
°C
Tvj
virtual junction temperature
150
°C
tsc
short-circuit time
1h
SYMBOL
PARAMETER
CONDITIONS
VALUE
UNIT
Rth(j-a)
thermal resistance from junction to ambient
in free air
60
K/W
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TDA7056B | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:5 W mono BTL audio amplifier with DC volume control |
| TDA7056B/N1 | 制造商:NXP Semiconductors 功能描述:AMP AUDIO 5.5W MONO AB 9SIL 制造商:NXP Semiconductors 功能描述:AMP, AUDIO, 5.5W, MONO, AB, 9SIL |
| TDA7056B/N1,112 | 功能描述:音频放大器 5W BTL MONO PWR 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 |
| TDA7056B/N1112 | 制造商:NXP Semiconductors 功能描述:IC AUDIO AMP AB 3.5W SIP-9 |
| TDA7057 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:2*8W stereo BTL audio output amplifier with DC volume control |
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