9
Functional Description
The driver uses a DC-DC converter to load a capacitor bank to a defined voltage. A PI regulator uses
T
1
and a shunt to control the current flow through the laser diode.
Laser diode current and compliance voltage are pre-processed and fed to the external BOB-connector.
Several security features protect the laser diode and driver from damage. D
1
protects the laser diode
from reverse currents. The switch S
1
is automatically opened when an over current as well as an
internal failure (such as over temperature, etc.) is detected.
Operation Principle of LDP-QCW driver
Element
Function
C1
Input Buffer Capacitor
Cb
Capacitor bank
S1
Security Switch
D1
Laser diode protection diode
T1
Current regulation MosFET
Shunt
LD-current monitor
