AVIC-D3/XU/UC
293
5
6
7
8
5
6
7
8
C
D
F
A
B
E
7.3 EXPLANATION
7.3.1 CIRCUIT DESCRIPTIONS
Overcurrent detection mechanism
1. The current exceeding the allowable range flows to the load side (=iPod).
2. The difference of electrical potential at both ends of R1805 becomes large exceeding approximately 0.6 V.
3. As a result of the difference of potential between the emitter and the base of Q1802, the current starts to flow from
the emitter to the base, and the difference of potential between the emitter and the collector becomes almost zero.
4. The difference of potential between the emitter and the base of Q1801 no longer exists, and Q1801 will close.
5. It is designed in a way that, if the output is grounded, the current will start flowing to Q1802 even before that and
that Q1801 will close.
-
FireWire PWR
FireWire : Power supply circuit to supply electricity to iPod.
Overcurrent detection resistor 0.47
Ω
A popular switch circuit.
When there is an overvoltage, D1878 will be ON
and PPW will be dropped down to Low level by
force so that the overvoltage will not be applied to
the iPod side.
Page 82 Address 4A
Summary of Contents for AVIC-D3/XU/EW5
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