MITSUBISHI
〈DIGITAL
ASSP〉
MITSUBISHI
〈DIGITAL
ASSP〉
M66510P/FP
M66510P/FP
LASER-DIODE DRIVER
LASER-DIODE DRIVER
DESCRIPTION
The M66510 is a semiconductor laser diode driver that drives
a semiconductor laser of the type whose cathode and the
anode of monitor photodiode are connected to the stem.
Laser driving current of up to 120mA can be set by applying
constant voltage from outside to drive the laser diode.
It operates from a 5V single power supply, allowing switching
of laser driving current at a speed of 20M bits/sec.
*: Our semiconductor laser is of R type.
FEATURES
• Built-in two outputs for monitoring laser power (comparator
output and analog output)
• With laser driving current forced off pin
• High-speed switching (20M bits/s)
• High driving current (120mA max.)
• 5V single power supply
APPLICATION
Laser beam printer
PIN CONFIGURATION (TOP VIEW)
V
CC1
CURRENT SETTING
INPUT 1
CURRENT SETTING
LOAD OUTPUT 1
CURRENT SETTING
INPUT 2
CURRENT SETTING
LOAD OUTPUT 2
LASER CURRENT
FORCED OFF INPUT
CURRENT SETTING
LOAD OUTPUT 3
MONITOR
LOAD INPUT 1
MONITOR
LOAD INPUT 2
1
20
→
1RO
19
→
2RO
18
→
LD
V
L1
→
2
1RC
←
3
V
L2
→
4
2RC
←
5
V
OFF
→
6
3RC
←
7
GND1
8
LASER CURRENT
LOAD OUTPUT 1
LASER CURRENT
LOAD OUTPUT 2
LASER DIODE
OUTPUT
MONITOR DIODE
INPUT
DATA INPUT
MONITOR
COMPARATOR
OUTPUT
MONITOR ANALOG
OUTPUT
DUTY
CONTROL INPUT
M66510P/FP
17
GND2
16
←
PD
15
←
DATA
14
V
CC2
13
→
CO
12
→
MO
11
←
CD
1RM
→
9
2RM
→
10
Outline 20P4K
BLOCK DIAGRAM
MONITOR OUTPUT
MO
12
COMPARATOR OUTPUT
CO
13
1RO
20
2RO
19
LINEAR
AMPLIFIER
COMPARATOR
(V
ref
= 1.2V)
CURRENT
SETTING V
L1
2
INPUT 1
1RC 3
CURRENT
SETTING V
L2
4
INPUT 2
2RC 5
CONSTANT CURRENT
SOURCE (I
L1
)
Max. 60mA
CONSTANT CURRENT
SOURCE (I
L2
)
Max. 30mA
3RC 7
CONSTANT CURRENT
SOURCE (I
L3
)
Max. 30mA
V
CC1
1
V
CC2
14
GND2 17
GND1 8
9
1RM
10
16
18
LD
LASER
DIODE OUTPUT
DIFFERENTIAL AMPLIFIER
CURRENT SWITCHING CIRCUIT
I
L
= I
L1
+ I
L2
+ I
L3
11
CD
DUTY
CONTROL INPUT
15
6
2RM
PD
MONITOR
DIODE INPUT
DATA
V
OFF
DATA INPUT LASER CURRENT
FORCED OFF
V
L1
, 1RC: LASER CURRENT (I
L1
) SETTING PIN
V
L2
, 2RC: LASER CURRENT (I
L2
) SETTING PIN
3RC: LASER CURRENT (I
L3
) SETTING PIN
V
CC1
, GND1: IC INTERNAL ANALOG POWER SUPPLY PIN
V
CC2
, GND2: IC INTERNAL DIGITAL POWER SUPPLY PIN
1
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