Wavelength Electronics WLD3343, Руководство пользователя

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WLD3343
PAGE 14
WLD3343-00400-O
1
2
3
4
5
6
7
14
13
12
11
10
9
8
WLD3343
LASER
DIODE
DRIVER
VDD
R
PD
R
LIM
1
TIE GROUND CONNECTIONS DIRECTLY TO PIN 7
R
SENSE
ENABLE
DISABLE
IMON
PMON
0.1
P
F
1
1
1
LD
PD LD PD
OR
VDD
D/A OR OR
Bandgap
Voltage
Reference
See Eq. 7
See Eq. 9
Constant Power: See Eq. 6
V
SET
Adjusting
Limit Current
See Table 2
and Eq. 3
Adjusting Laser Diode
Current Range
See Table 1 or Eq. 1
Adjusting Photodiode
Current Range
See Table 3 or Eq. 4
1
2k
www.national.com
Part #LM4040
1k
PDMAX
PD
I
1
R
With Evaluation Board
Without Evaluation Board
=
V
SET
= (Desired I
PD
) * (2*R
PD
)
PD Range R
PD
2.0 mA
200
P
A
499
:
4.99 k
:
LDMAX
SENSE
I
25 . 1
R
With Eval Board (Rev. Level)
Without Evaluation Board
=
LD Range R
SENSE
(Rev. C)
2.0 A
200 mA 438 m
:
5.01
:
R
SENSE
(Rev. A&B)
500 m
:
5.1
:
1
2
3
4
5
6
7
14
13
12
11
10
9
8
WLD3343
LASER
DIODE
DRIVER
VDD
R
LIM
1
TIE GROUND CONNECTIONS DIRECTLY TO PIN 7
R
SENSE
ENABLE
DISABLE
IMON
NC
1 k
:
1
1
1
LD
PD LD PD
OR
VDD
D/A OR OR
Bandgap
Voltage
Reference
See Eq. 7
Constant Current: See Eq. 5
V
SET
Adjusting
Limit Current
See Table 2
and Eq. 3
Adjusting Laser
Diode Current Range
See Table 1 or Eq. 1
1
1
R
PD
I
PD
= V
PD
+
-
V
PD
R
PD
2k
Part # LM4040
www.national.com
1k
LDMAX
SENSE
I
00 . 1
R
With Eval Board (Rev. Level)
Without Evaluation Board
=
V
SET
= (Desired I
LD
) * (2*R
SENSE
)
LD Range R
SENSE
(Rev. C)
2.0 A
200 mA 438 m
:
5.01
:
R
SENSE
(Rev. A&B)
500 m
:
5.1
:
Free Design Calculator: http://www.teamwavelength.com/support/calculator/wld/default.php
7. OPERATING a Type A/B Laser Diode
Figure 7
A/B Laser Diode Constant Current Operation
Figure 8
A/B Laser Diode Constant Power Operation
Free Design Calculator: http://www.teamwavelength.com/support/calculator/wld/default.php
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