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參數(shù)資料
| 型號： | M66512P |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | LASER-DIODE DRIVER |
| 中文描述： | 激光二極管驅動器 |
| 文件頁數(shù)： | 4/10頁 |
| 文件大小： | 143K |
| 代理商： | M66512P |
4
MITSUBISHI
DIGITAL ASSP
M66512P/FP
LASER-DIODE DRIVER
5. RO Pin
The RO pin is used to connect a load resistor (RO) for the
current sources (I
L1
, I
L2
, and I
L3
). The load resistor is con-
nected between the RO pin and V
CC
in order to reduce the
power dissipated in the IC.
The resistance of the load resistor should be such that does
not generate a voltage equal to or lower than 2.5V at the RO
pin. Accordingly, a value that satisfies the following equation
should be chosen.
V
CC
–2.5[V]
maximum load current flowing through RO [A]
Example: If V
CC
=5V and the maximum load current is 120
mA, RO is 20
or under.
6. Internal Reset Function
The M66512 has a reset circuit for the protection of laser from
an excessive current flowing at the moment of power on. The
reset circuit functions in the range V
CC
< 3.5V(typ.), letting all
current sources turn off.
7. V
CC
and GND Pins
Pins related to the power supply function are V
CC1
, V
CC2
,
GND1, and GND2. The role of these pins in terms of the in-
ternal circuits are as follows.
V
CC1
, GND1 : connected to analog circuits
V
CC2
, GND2 : connected to digital circuits
In practical wiring, the following should be noted.
(1)Secure as much a width as possible for conductors and
avoid lengthy wiring.
(2)Allocate electrolytic capacitors for stable voltage near
V
CC1
and GND1.
(3)Allocate by-pass capacitors near V
CC2
and GND2.
Notes on the Wiring for peripheral Components
Lay out peripheral components necessary for the M66512 to
operate in closest possible proximity to the M66512.
Calculation Method for Power Dissipation
The M66512’s approximated power dissipation, P, is deter-
mined by the following equation.
P=I
CC
×
V
CC
+I
(RO)
×
V
(RO)
+ I
(LD)
×
V
(LD)
+ I
OL(CO)
×
V
OL(CO)
Where V
(RO)
: voltage at RO pin
V
(LD)
: voltage at LD pin
I
(RO)
: load current at RO pin
I
(LD)
: load current at LD pin
V
OL(CO)
: “L” output voltage at CO pin
I
OL(CO)
: “L” output voltage at CO pin
If, for example, V
CC
= 5.25V, V
(RO)
= V
(LD)
= 2.75V, I
(RO)
=
I
(LD)
= 120mA, I
OL(CO)
= 8mA, and V
OL(CO)
= 0.5V, power dis-
sipation at times of turning on and off of laser will be as fol-
lows.
(1)Laser ON (DATA =“L” and I
CC
= 75mA)
P
ON
= 75
×
5.25 + 0 + 120
×
2.75 + 8
×
0.5 = 727.8(mW)
(2)Laser OFF (DATA =“H” and I
CC
= 74mA)
P
OFF
= 74
×
5.25 + 120
×
2.75 + 0 = 718.5(mW)
RO (
)
≤
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