IC-WKM SO8-TP LASER COMPONENTS, IC-WKM SO8-TP Datasheet - Page 8

• Manufacturer Part Number: IC-WKM SO8-TP
• Description: IC, DRIVER LASER DIODE, SOIC8, WKM
• Manufacturer: LASER COMPONENTS

Specifications of IC-WKM SO8-TP

• Laser Driver Type: Laser Diode
• Supply Current: 350mA
• Supply Voltage Range: 3.6V To 15V
• Driver Case Style: SOIC
• No. Of Pins: 8
• Operating Temperature Max: 85°C
• Operating Temperature Min: -40°C
• Base Number: 08
• Device Type: LED
• Ic Generic Number: WKM
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Laser diode types
In principle, all three laser diode types can be operated
by iC-WKM.
This specification is for a newly developed product. iC-Haus therefore reserves the right to change or update, without notice, any information contained herein,
design and specification; and to discontinue or limit production or distribution of any product versions. Please contact iC-Haus to ascertain the current data.
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in the materials. The data specified is intended solely for the purpose of product description. No representations or warranties, either express or implied, of
merchantability, fitness for a particular purpose or of any other nature are made hereunder with respect to information/specification or the products to which
information refers and no guarantee with respect to compliance to the intended use is given. In particular, this also applies to the stated possible applications or
areas of applications of the product.
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mark rights of a third party resulting from processing or handling of the product and/or any other use of the product.
APPLICATION NOTES
iC-WKM
M-TYPE CW LASER DIODE DRIVER
Figure 3: Operation of an M-type laser diode
Figure 5: Operation of an N-type laser diode
Figure 4: Operation of a P-type laser diode
As iC-WKM has been optimised for use with M-type
laser diodes, it is with this type of diode that the best
functionality is achieved. This type of setup also en-
ables the laser diode package to be connected to GND.
With P-type laser diodes it is also possible to connect
the laser diode package to GND. Here, however, the
current mirror at MDK introduces a certain error to the
automatic power control (c.f. Electrical Characteristics
Nos. 108-110).
Even N-type laser diodes can be operated by iC-WKM;
iC-WKN, however, which has been optimised for use
with these diodes, may be a better choice.
Layout
To prevent instability of the regulator an additional ca-
pacitor (ca. 100 pF) must be positioned directly at the
iC’s pin CI. Depending on the laser diode, capacitor
CM with typ. 2 nF in parallel to RM may be required for
stability.
Pin AGND acts solely as a ground reference for the
power regulator (CI and RM) and should not be short-
circuited with GND externally. This could have a neg-
ative effect on the control behavior and monitor func-
tions.
Cooling
Laser diodes should be sufficiently cooled, particularly
with the power-regulated operation of setups which
use iC-WKM, for example. The power dissipation in
the laser diode otherwise causes the diode to heat up
and the level of efficiency to drop which the power con-
trol unit then compensates for by increasing the laser
current. This in turn brings about a rise in power dissi-
pation in the laser diode and thus also in temperature.
In this instance the laser diode could be damaged (re-
sulting in spottiness and an increase in operating cur-
rent) or even destroyed before the overcurrent shut-
down threshold in iC-WKM is reached. This applies in
particular to blue laser diodes whose power dissipation
is considerably higher than that of red laser diodes, for
example, due to the higher forward voltage.
Rev C1, Page 8/9