APC
The laser diode has large negative temperature characteristic in its optical output when
driven with a constant current on laser diode. Therefore, the output on processing monitor
photo diode, must be a controlled current for getting regular output power, thus the APC
(Auto Power Control) circuit is composed.
Reference Power Supply
A reference power supply for servo is built-in. The current capacity of the reference supply
is about 3 mA.
V
REF1
= 1/2 V
CC1
= 2.5 V
V
REF2
= 1/2 V
CC2
= 1.65 V
where V
CC1
= 5 V and V
CC2
= 3.3 V
19
LD
2
1
V
CC1
PD
170mV
LASER UNIT
C33
R18
Q1
LDON
20
R
V
CC1
R
R/2
V
REF1
22
R
V
CC2
R
R/2
V
REF2
20
FL8380
Содержание FL 8380
Страница 21: ...FL8380 ...
Страница 22: ...FL8380 ...
Страница 23: ...FL8380 ...
Страница 24: ...FL8380 ...
Страница 25: ...FL8380 ...
Страница 27: ...FL8380 27 ...
Страница 28: ...FL8380 28 ...
Страница 29: ...FL8380 29 ...
Страница 30: ...FL8380 30 ...
Страница 31: ...FL8380 31 ...
Страница 32: ...FL8380 32 ...
Страница 54: ...Motor driver IC BA6209 BA6209N Measurement circuit FL8380 54 ...
Страница 59: ...FL8380 59 ...
Страница 60: ...FL8380 60 ...
Страница 68: ...FL8380 68 ...
Страница 69: ...FL8380 69 ...
Страница 70: ...FL8380 70 ...
Страница 71: ...FL8380 71 ...