- 7 -
5. Mode description.
Driver provides two modes of operation: Quasi Continuous Wave (quasi
steady-state) mode and Pulse mode.
5.1. Quasi continuous wave mode
– the oscillating mode of symmetrical unipolar
meander (fig.2.). Such mode provides maximum average optical power from the
LED. The Led current in this mode can be changed in the range from 20 to 250
mA by using the multiposition switch for adjusting the LED current (12). Using
the button 5 one of four frequencies (512 Hz, 2 kHz, 8 kHz and 16 kHz) can be
selected. The pulse duration will be respectively equal 1000 µs, 250 µs, 62 µs and
31 µs.
Fig.2
. Current-time
relation in case of continuous wave mode.
5.2. Pulse
mode
– the oscillating mode of pulse sequence (fig.3). Such mode
provides maximum peak optical power from the LED. Similarly to the quasi
continuous wave mode, by adjusting the switch 12 the LED current can be
changed, but in the wider range: from 0,1 to 2,0 A. Using the button 5 one of the
four frequencies (512 Hz, 2 kHz, 8 kHz and 16 kHz) can be selected. Pulse
duration can be also selected in the range from 0.6 to 20 µs with the help of switch
3.
Fig.2.
Current-time
relation in case of pulse mode.
0,6 -20 µs
62-2000 µs
f=0,5-16 kHz
31-1000 µs
31-1000 µs
20-250 m
А
f=0,5-16 kHz
0-2
А
SUNSTAR传感与控制 http://www.sensor-ic.com/ TEL:0755-83376549 FAX:0755-83376182 E-MAIL:[email protected]
SUNSTAR自动化 http://www.sensor-ic.com/ TEL: 0755-83376489 FAX:0755-83376182 E-MAIL:[email protected]
