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参数资料
| 型号： | TA8876FA |
| 元件分类： | 接收器 |
| 英文描述： | AUDIO/VIDEO DEMODULATOR, PDSO30 |
| 封装： | 0.375 INCH, 1 MM PITCH, PLASTIC, SSOP-30 |
| 文件页数： | 6/20页 |
| 文件大小： | 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
14 of 56
NXP Semiconductors
TDF8554J
4
45 W power amplifier with multiple voltage regulator
7.5.1 Start-up diagnostics with DC load detection
If the start-up diagnostics are enabled, the load condition of all four channels is
determined. At the end of the start-up diagnostics cycle, not only the load condition is
known (shorted load, normal load or open load), but also if a separate amplifier is
connected or if the outputs are shorted to battery or ground. If a separate amplifier
(booster) is detected, the amplifier can start-up in line driver mode (low gain setting).
The load diagnostic is insensitive to door-slam (slowly moving speaker due to slamming of
the car door) and to external interference such as crosstalk of relays switching in the
wiring harness; see Figure 8.
The load detection values are shown in Figure 9.
If only 4
speakers are connected, the low gain mode can be selected during the start-up
diagnostics. A shorted load is indicated until an impedance of 1.5
is reached. Even ‘soft’
shorts in the wiring harness will be detected.
Overvoltage protection (20 V)
yes
Over voltage pre-warning (16 V) can be enabled if IB4[D3] = 1
Start-up diagnostic notification
no
Maximum temperature
protection active
yes
Table 4.
Diagnostic information on pin DIAG
Diagnostic information
Pin DIAG
Fig 8.
Principle of start-up diagnostics
Fig 9.
Start-up diagnostics load detection levels
COMPARATORS
SPIKE
FILTER
DOOR-SLAM
PROCESSOR
OFFSET
GENERATOR
I2C-BUS BITS
LOAD CONDITION
001aam697
out +
out
SHORTED
NORMAL
LINE DRIVER
OPEN
0.5
Ω
1.5
Ω
high gain
low gain
1.5
Ω
3.2
Ω
20
Ω
20
Ω
80
Ω
80
Ω
200
Ω
200
Ω
400
Ω
400
Ω
001aaam698
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