6
Current Regulator
The LDP-QCW implements a proportional integral (PI) regulator to control the current flow
through the connected load. The following diagram shows a simplified layout:
Depending on the chosen operating mode the user has the possibility to modify all relevant
parameters to a specific need. This is done through the digital interface (RS-232). See below
for more information.
PicoLAS implemented an active nonlinearity compensation of the output stage. This speeds
up the device, prevents excessive current overshoots and yields a better accuracy with high
impedance loads.
The influence of this part of the regulator can be user defined and is called FFwd.
However, the interconnection between the voltage and the current flow on the output is
calibrated during fabrication. This is used in operating mode 1. So, it is not necessary to
change this value if only these operating modes are used. If needed, it can be adjusted
between the values 0 to 7.5 by the customer.
Be careful if changes are performed with the FFwd value. The effect is high and may
cause damage to the connected load if not adjusted properly. Wrong settings are not
covered by warranty.
