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參數(shù)資料
| 型號： | M61880FP |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | Laser-diode driver / controller |
| 中文描述： | 激光二極管驅(qū)動器/控制器 |
| 文件頁數(shù)： | 8/11頁 |
| 文件大?。?/td> | 160K |
| 代理商： | M61880FP |
( / )
8
MITSUBISHI
<
DIGITAL ASSP
>
M61880FP
Laser-diode driver / controller
Explanation for setting Laser switching current
11
2.5V
CH
2K
250μA
250μA
1.5V
RS
LD
V1
V2
I1
I2
Vd
Id
I
SW
+
AMP1
–
I
SW2
2XI
SWO
2XI
SWO
Vcc
Vcc
VB
CURRENT SW
1:1
2XI
SWO
The circuit of setting switching current
1. The circuit of setting center value(Isw0) of
maximum switching current
The circuit of setting center
value (Isw0)of maximum
switching current(2X Isw0)
Fig.1 Equivalent circuits of setting switching current
2. The circuit of setting switching current
I
SW2
I
SW1
D1
D2
Q1
Q2
Isw2=2 Isw0 xI1+I2
Isw is as follows
I1
(6)
Isw0[mA]=30 xVref(1.5V)[V]
RS[k
]
(1)
Id =
V
2K
(2)
I1=250μA-Id
I2=250μA+Id
(3)
(
(4)
I1
I2
Isw2
Isw1
=
Isw1+Isw2=2 Isw0
(5)
Isw=2 Isw0-Isw2
(7)
Isw=2 Isw0( I2
I1+I2
Id
250μA
(8)
(9)
Isw=Isw0(1+ )
Isw=Isw0(1+ V/2K
250μA
(10)
The setting center value(Isw0) of maximum switching
current, 2 X Isw0,set up Rs ( load for switching current
setting). Isw0 (the value that is initialized) is
When
V is a difference voltage of between
CHpin and 2.5V,Id is
So I1 and I2 is as follows
D1,D2,Q1 and Q2 construct a Gilbert circuit.
The relation of I1,I2,Isw1, Isw2 and Isw0 is
So Isw2 is
Next the relation between Isw and
V
would be introduced .
Isw is able to solve with (6), (7),(3) and (2)equation.
1:1
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