BA6387K Просмотр технического описания (PDF) - ROHM Semiconductor
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BA6387K Datasheet PDF : 13 Pages
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Optical disc ICs
(3) APC block and AGC block
BA6387K
lagc=50µA
20k
20k
BL
−
20k
Tr1
PL
+
MUTE
High-off
11 FON
13.3k
V1
V-I
2.64k
18
5
6
7
1µF
1µF
10µH
PD
LD
1µF
Fig.6 APC and AGC blocks
The initial setting for V1 is 1.2V. When PL-BL (the RF AC
amplitude) exceeds a certain value (VAGC), then AGC
lowers V1 and suppresses the laser power. The value of
VAGC is (50µA × 20k) = 1V.
When defect turns high, Tr1 turns OFF. When FON (pin
11) is low, the LD output (pin 6) becomes high.
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