5
Functional Description
The driver uses a DC-DC converter to load a capacitor bank to a defined voltage. It can
provide a maximum voltage of 34 V to load the storage capacitor bank Cb.
A P-I regulator using T
1
and T
2
are controlling the current flow through the laser diode. These
regulators are triggered by an internal timing generator that is triggered by either an external
trigger signal or via software through the RS-232 interface.
Several security features protect the laser diode and the driver from damage. D
1
protects the
laser diode from reverse currents. The switch S
1
is automatically opened when an internal
failure or an interlock condition is detected.
Operation Principle of LDP-QCW Driver
Element
Function
C
1
Input buffer capacitor
Cb
Capacitor bank
S
1
Security switch
D
1
Laser diode protection diode
T
1
, T
2
Current regulation MosFET
Shunt
LD current monitor
