參數(shù)資料
型號(hào)： TDA8946
廠商： NXP Semiconductors N.V.
元件分類(lèi)： 運(yùn)動(dòng)控制電子
英文描述： 2 x 15 W stereo Bridge Tied Load BTL audio amplifier
中文描述： 2 x 15瓦的立體聲橋接負(fù)載橋接音頻放大器
文件頁(yè)數(shù)： 6/23頁(yè)
文件大?。?/td> 393K
代理商： TDA8946
Philips Semiconductors
TDA8946J
2 x 15 W stereo BTL audio amplifier
Product specification
Rev. 02 — 14 March 2000
6 of 23
9397 750 06863
Philips Electronics N.V. 2000. All rights reserved.
Mute —
In this mode the amplifier is DC-biased but not operational (no audio output);
the DC level of the input and output pins remain on half the supply voltage. This
allows the input coupling and Supply Voltage Ripple Rejection (SVRR) capacitors to
be charged to avoid pop-noise. The device is in mute mode when
3 V < V
MODE
< (V
CC
1.5 V).
Operating —
In this mode the amplifier is operating normally. The operating mode is
activated at V
MODE
< 0.5 V.
8.3.1
Switch-on and switch-off
To avoid audible plops during supply voltage switch-on or switch-off, the device is set
to standby mode before the supply voltage is applied (switch-on) or removed
(switch-off).
The switch-on and switch-off time can be influenced by an RC-circuit on the MODE
pin. Rapid on/off switching of the device or the MODE pin may cause ‘click- and
pop-noise’. This can be prevented by proper timing of the RC-circuit on the MODE
pin.
8.4 Supply Voltage Ripple Rejection (SVRR)
The SVRR is measured with an electrolytic capacitor of 10
μ
F on pin SVR at a
bandwidth of 10 Hz to 80 kHz.
Figure 13 on page 12
illustrates the SVRR as function
of the frequency. A larger capacitor value on the SVR pin improves the ripple rejection
behaviour at the lower frequencies.
8.5 Built-in protection circuits
The TDA8946J contains two types of protection circuits, i.e. short-circuit and thermal
shutdown.
8.5.1
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 0.7 A,
switches the power stage to standby mode (high impedance).
Short-circuit across the load —
This is detected by an absolute-current
measurement. An absolute-current larger than 3 A, switches the power stage to
standby mode (high impedance).
8.5.2
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 standby mode (high impedance).
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TDA8946AJ 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:2 x 15 W BTL audio amplifier with DC gain control
TDA8946AJ/N2,112 功能描述:音頻放大器 2X15W AUDIO AMP VOL CTRL 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
TDA8946J 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:2 x 15 W stereo Bridge Tied Load BTL audio amplifier
TDA8946J/N1,112 功能描述:音頻放大器 AUDIO AMP 2X15W 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
TDA8947J 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:4-channel audio amplifier (SE: 1 W to 25 W; BTL: 4 W to 50 W)
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