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| 型号： | TDF8554J/N4 |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 44 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM37 |
| 封装： | PLASTIC, SOT725-1, 37 PIN |
| 文件页数： | 7/56页 |
| 文件大小： | 597K |
| 代理商： | TDF8554J/N4 |
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TDF8554J
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 1 — 31 August 2011
15 of 56
NXP Semiconductors
TDF8554J
4
45 W power amplifier with multiple voltage regulator
In the first stage an offset is generated across the load. To avoid plop-noise, the offset is
generated in 15 ms, next the actual load measurement is done. Finally, the offset across
the load is reduced again after 15 ms. The complete start-up measurement cycle lasts for
tsudiag.
If the voltage of the outputs is more than 3.5 V during the first stage, the start-up
diagnostic is switched off to avoid damage to the amplifier. This can happen with a door
slam or with a short to VP. If a short to VP is applied, the shorted channel will report not
valid after the first stage. If only 1 or 2 channels report not valid after the first stage, a short
to VP or of those channels can be assumed. If all 4 channels report not valid, an under- or
over-voltage during the start-up diagnostic cycle can be assumed.
The start-up diagnostics has a built-in spike filter to remove disturbances caused by
switching relays in the wiring harness or EMC. The door-slam processor filters out
disturbances caused when the car door closes: car door-slam can cause the speakers to
move slowly which disturbs the measurement. With these filter techniques, reliable load
detection is performed in a single start-up diagnostics cycle.
If necessary, the start-up diagnostics can be repeated. Only the first stage, where the
speaker load is determined, is sensitive to disturbance and can be repeated. When the
start-up diagnostics start, the invalid bits are set, and “the start-up diag busy bit” (bit
DB4[D6]) indicates that the start-up diagnostic is not yet completed. When the start-up is
completed, or interrupted by a POR, the “start-up diag busy bit” is reset.
(1) First stage: open load/load/line driver short across the load.
(2) Second stage: amplifier start plus short to ground/VP speaker fault.
Fig 10. Start-up with start-up diagnostics
001aam699
td(sudiag-on)
tsudiag
tamp_on
(2)
(1)
IB1[D1]
turn on diagnostic
enable
STB
amplifier
output
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| TDF8704T/4-T | 1-CH 8-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO24 |
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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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