1-2. ALPC (Automatic Laser Power Control) Circuit
ALPC function of IC101(MT1959H) is for the constant power control. Based on the FM(Front Monitor) in OPU, ALPC
feedback loop maintains constant power level against laser diode’s temperature variation. RDAC is for Read Power control
and W1DAC is for Write Power control. VDAC is for the reference voltage of FM. Ipac, Vref, FM+, FM- are analog singal and
SEN, SDIO, SCLK are digital signal.
26
Filter
RDAC
VDAC
W1DAC
LPF
LPF
S/H
S/H
LDD
103
Iapc
37
5
Vref
40
108
FM+
23
107
FM-
24
35
SEN
29
33
SDIO
30
34
SCLK
31
IC101 (MT1959H)
CN801
Optical
Pick-up
FM
DESCRIPTION OF CIRCUIT
1. ALPC (Automatic Laser Power Control) Circuit
1-1. Block Diagram
Summary of Contents for BP50NB40
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Page 23: ...23 2 CONNECTOR 66 PIN ASSIGNMENT ...
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Page 29: ...29 3 1 2 Block Diagram Seek IC101 MT1959H ...
Page 34: ...1 2 Pin Layout RF Part 34 ...
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Page 45: ...45 IC601 TPIC2016G SPINDLE MOTOR AND 10CH ACTUATOR DRIVER Terminal Assignments ...