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参数资料
| 型号： | TDF8553J |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 87 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM37 |
| 封装： | PLASTIC, SOT725-1 |
| 文件页数： | 2/47页 |
| 文件大小： | 391K |
| 代理商： | TDF8553J |
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TDF8553J_1
NXP B.V. 2008. All rights reserved.
Objective data sheet
Rev. 01 — 3 December 2008
10 of 47
NXP Semiconductors
TDF8553J
4
× 50 Watt power amplier and multiple voltage regulator
8.5.6 Input and AC ground capacitor values
The negative inputs to all four amplier channels are combined at pin ACGND. To obtain
the best performance of supply voltage ripple rejection and unwanted audible noise, the
value of the capacitor connected to pin ACGND must be as close as possible to 4 times
the value of the input capacitor connected to the positive input of each channel.
8.5.7 Load detection
8.5.7.1
DC-load detection
When DC-load detection is enabled, during the start-up cycle, a DC-offset is applied
slowly to the amplier outputs, and the output currents are measured. If the output current
of an amplier rises above a certain level, it is assumed that there is a load of less than
6
and bit D5 is reset in the associated data byte register to indicate that a load is
detected.
Because the offset is measured during the amplier start-up cycle, detection is inaudible
and can be performed every time the amplier is switched on.
8.5.7.2
AC-load detection
AC-load detection can be used to detect that AC-coupled speakers are connected
correctly during assembly. This requires at least 3 periods of a 19 kHz sine wave to be
applied to the amplier inputs. The amplier produces a peak output voltage which also
generates a peak output current through the AC-coupled speaker. The 19 kHz sine wave
is also audible during the test. If the amplier detects three current peaks that are greater
than 550 mA, the AC-load detection bit is set. Three current peaks are counted to avoid
false AC-load detection which can occur if the input signal is switched on and off. The
peak current counter can be reset by setting bit D1 of instruction byte IB1 to logic 0.
To guarantee AC-load detection, an amplier current of more than 550 mA is required.
AC-load detection will never occur with a current of less than 150 mA.
Figure 3 shows which AC loads are detected at different output voltages. For example, if a
load is detected at an output voltage of 2.5 V peak, the load is less than 4
. If no load is
detected, the output impedance is more than 14
.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TDF8590TH | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:2 X 80 W SE (4 OHM) or 1 X 160 W BTL (8 OHM) class-D amplifier |
| TDF8590TH/N1,118 | 功能描述:音频放大器 AMPLIFIER CLASS D 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 |
| TDF8590TH/N1S,118 | 功能描述:音频放大器 4/8 OHM CLASS D 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 |
| TDF8590TH/N1-T | 功能描述:音频放大器 AMPLIFIER CLASS D 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 |
| TDF8590TH/N1TJ | 制造商:NXP Semiconductors 功能描述:- Tape and Reel |
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