IC-HK_1 Datasheet, PDF (1/13 Pages) IC-Haus GmbH – 155MHz LASER SWITCH

iC-HK
155MHz LASER SWITCH
Rev 21.11.01, Page 1/13
APPLICATION NOTES
Setting the laser current
When switching DC currents of up to 150mA or pulse currents of up to 700mA one channel is sufficient
(Example 1). Input ENx of the unused channel should be jumpered to GND and pin AGNDx left open. Higher
currents or several different current levels can be obtained by using both channels (Example 2 and 3).
Example 1: Switching a current of 100mA
1. 100mA < 150mA | one channel
2. Switching on and off only | RK can be
omitted (RK = 0S)
3. As shown in Figure 1 (cf. data sheet, Figures
2..4), the required voltage V(CI) for RK = 0S
is read off at I(LDK) = 100mA as V(CI) =
1.75V
Fig. 1: Determining V(CI) for Example 1 - pulse
current of 100mA
Fig. 2: Signal patterns for Example 1 -
pulse current of 100mA
With the circuit shown in Figure 3 and a voltage of
1.75V at pin CI the laser current can be switched
between typically 0mA and 100mA by applying an
appropriate pulse pattern to EN1.
Fig. 3: Circuit with iC-HK for Example 1 -
pulse current of 100mA