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參數(shù)資料
| 型號(hào)： | M66510FP |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | LASER-DIODE DRIVER |
| 中文描述： | 激光二極管驅(qū)動(dòng)器 |
| 文件頁數(shù)： | 3/10頁 |
| 文件大?。?/td> | 224K |
| 代理商： | M66510FP |
3
MITSUBISHI
DIGITAL ASSP
M66510P/FP
LASER-DIODE DRIVER
I
L1
[mA] = 12
×
DESCRIPTION OF OPERATION
1. Setting laser driving current
The M66510 is provided internally with three constant current
sources I
L1
, I
L2
and I
L3
, allowing setting of each independent
output current.
The methods of setting I
L1
to I
L3
are given below in (1) to (3).
(1) Method of setting I
L1
I
L1
is approximated by the V
L1
pin input voltage and the re-
sistor (RC1) connected between 1RC pin and GND as fol-
lows:
V
L1
[V]
RC1[k
]
However, 0
≤
V
L1
≤
V
CC
– 1.8V, I
L1(max.)
= 60mA
(2) Method of setting I
L2
I
L2
is approximated by the V
L2
pin input voltage and the re-
sistor (RC2) connected between 2RC pin and GND as fol-
lows:
V
L2
[V]
RC2[k
]
However, 0
≤
V
L2
≤
Vcc – 1.8V, I
L2(max.)
= 30mA
(3) Method of setting I
L3
I
L3
is approximated by the internal reference voltage (V
ref
)
and the resistor (RC3) connected between 3RC pin and GND
as follows:
V
ref
[V]
RC3[k
]
However, V
ref
= 1.2V (standard), I
L3(max.)
= 30mA
Note: The expressions for setting I
L1
to I
L3
are typical. Actually, the set values
fluctuate several % depending on IC lot dispersion or operating ambient
temperature (See the ELECTRICAL CHARACTERISTICS).
2. Switching operation
The laser is turned on when DATA = “L”. At this time, the la-
ser driving current is I
L1
+ I
L2
+ I
L3
.
The laser is turned off when DATA = “H”. At this time, the la-
ser driving current becomes almost 0 regardless of I
L1
to I
L3
.
3. Usage of V
OFF
input
The current which flows into the laser becomes 0 when
DATA = “H”. And the laser is turned off but the internal cur-
rent sources are active.
Contrarily, the internal current sources are turned off when
V
OFF
= “L”. It is therefore possible to prevent overcurrent from
flowing into the laser by setting V
OFF
input to “L” until V
CC
reaches 3.5V (standard) at the power-ON time, for example
(See 6. Internal reset).
4. Laser power monitor operation
The M66510 outputs the information on monitor photodiode
(PD) built in the laser from the MO and CO pins in the flow
given below.
(1) The current equal to the PD current produced through
emission of the laser flows into the resistor (RM) connected
between 1RM and 2RM. The potential difference (V
M
) pro-
duced on RM is converted into a level from GND by the inter-
nal differential amplifier.
I
L2
[mA] = 6
×
I
L3
[mA] = 10
×
(2) The V
M
is output as an analog output from the MO pin
through the buffer amplifier and compared to the internal ref-
erence voltage V
ref
(1.2V standard) by the comparator. Then
the result of comparison is output from the CO pin on the TTL
level.
Monitor circuit schematic drawing
Condition
V
M
< V
ref
V
M
> V
ref
CO output
“L”
“H”
V
M
RM
Differential
amplifier
Buffer
amplifier
Comparator
+
MO output
CO output
–
–
+
+
–
LD
V
ref
PD
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| M66510P | LASER-DIODE DRIVER |
| M66512FP | LASER-DIODE DRIVER |
| M66512P | LASER-DIODE DRIVER |
| M66515FP | LASER-DIODE DRIVER/CONTROLLER |
| M66515 | LASER-DIODE DRIVER/CONTROLLER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M66510P | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:LASER-DIODE DRIVER |
| M66512FP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:LASER-DIODE DRIVER |
| M66512P | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:LASER-DIODE DRIVER |
| M66515 | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:LASER-DIODE DRIVER/CONTROLLER |
| M66515FP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:LASER-DIODE DRIVER/CONTROLLER |
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