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| 型號： | LB11691 |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 0.05 A, PDIP36 |
| 封裝： | 0.400 INCH, DIP-36 |
| 文件頁數(shù)： | 13/19頁 |
| 文件大小： | 204K |
| 代理商： | LB11691 |
TDF8546
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 3 — 30 August 2011
20 of 61
NXP Semiconductors
TDF8546
I2C-bus controlled 4
45 W best efficiency amplifier
In the first stage an offset is generated across the load. To avoid switch-on plop-noise the
offset is increased after 15 ms. The measurement cycle lasts tsudiag. After 15 ms the offset
across the load is reduced. The offset is generated with resistors instead of the amplifier
to avoid plop-noise during engine start. If the offset is removed quickly, audible plop can
occur during periods without audio.
If the output 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 is applied to VP, that channel with the short will report
invalid after the first stage. If only one or two channels report invalid after the first stage, a
short to VP in those channels can be assumed. If all four channels report invalid, under-
over- voltage, a startup 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.
The start-up diagnostics can be repeated. Only the first stage, where the speaker load is
determined, is sensitive to disturbance and needs to be repeated. When the start-up
diagnostics start, the invalid bit is set, and “start-up diag busy bit” (TDF8546 bit DB5[D5])
indicates that the start-up diagnostics are not completed. When the start-up is completed,
or interrupted by a POR, the “start-up diag busy bit” is reset.
Two situations are possible:
(1) First stage: open load/load/line driver load; short across the load.
(2) Second stage: amplifier start plus short to ground/VP; speaker fault.
(3) Latch of speaker fault.
Fig 16. Start-up with start-up diagnostics
001aao405
td(sudiag-on)
tsudiag
tamp_on
(2)
(1)
(3)
IB1[D1]
turn on diagnostic
enable
STB
amplifier
output
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