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參數(shù)資料
| 型號： | TA8876FA |
| 元件分類： | 接收器 |
| 英文描述： | AUDIO/VIDEO DEMODULATOR, PDSO30 |
| 封裝： | 0.375 INCH, 1 MM PITCH, PLASTIC, SSOP-30 |
| 文件頁數(shù)： | 7/20頁 |
| 文件大?。?/td> | 443K |
| 代理商： | TA8876FA |
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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