Wavelength Electronics WHS302, Техническое описание и руководство по эксплуатации

Страница: 14 / 28

© 2018 www.teamWavelength.com 14
WLD SERIES LASER DIODE DRIVERS
CONNECTION DIAGRAMS FOR TYPE C LASERS
VALUE DETAILS VALUE DETAILS
V
SET
Eq. (9) on page 15 R
LIM
Eq. (7) on page 11
IMON Eq. (11) on page 15 R
SENSE
Eq. (3) & (4) on page 10
PMON Eq. (13) on page 15 R
PD
Eq. (8) on page 12
Constant Current:
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 Ω
1
1
1
LD
PD LD PD
OR
VDD
D/A
OR OR
Bandgap
Voltage
Reference
V
SET
1
R
PD
I
PD
= V
PD
+
-
V
PD
R
PD
VDD
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 Ω
5.01
Ω
R
SENSE
(Rev. A&B)
500 m Ω
5.1
Ω
Figure 10. Type C laser configured for Constant Current operation.
Constant Power:
1
2
3
4
5
6
7
14
13
12
11
10
9
8
WLD3343
LASER
DIODE
DRIVER
R
PD
R
LIM
1 TIE GROUND CONNECTIONS DIRECTLY TO PIN 7
R
SENSE
ENABLE
DISABLE
IMON
PMON
0.1 µ F
1
VDD
D/A
OR OR
Bandgap
Voltage
Reference
V
SET
1
VDD
1
LD
PD LD PD
OR
2k
Part #LM4040
www.national.com
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 µ A
499
Ω
4.99 k Ω
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 Ω
5.01
Ω
R
SENSE
(Rev. A&B)
500 m Ω
5.1
Ω
Figure 11. Type C laser configured for Constant Power operation.
Type C Laser Diode
Common
Anode
Laser Diode Cathode &
Photodiode Anode Common
Use the online WLD Circuit
Calculator to automatically
determine values for external
components.
www.teamwavelength.com/
support/design-tools/wld-
calculator/