10
Power Supply Requirements
The driver requires a stab5 V supply (used by control logic).
Adhere to the power-up sequence as follows:
1) Fully ramp up the +5 V rail
2) Enable the HV supply
3) Apply trigger signal
Should you aim to connect a large number of driver units to a single power supply the high
start-up current spikes can be taken care of by using an additional capacitor bank and hard
power switching at its output. Failure to meet this requirement may cause the gate driver
circuitry to stay in a faulty state.
To reveal that you have to feed the power 5 V or +HV in, there are two blue LEDs
included. They indicate that the power supply is turned on.
Figure 4: Close up of the laser diode driver and LEDs
Note: The +HV laser diode supply can be interrupted at any time e.g. for safety reasons by
the customer.
Trigger Output Monitor
The trigger output signal is generated with an integrated, isolated Rogowski coil and
provides an ultra fast galvanically isolated signal. The signal shape is proportional to the
derivative of the load current. It can be used for a current response triggering signal and
has no delay to the load current. Combined with an integrator it is possible to use this
signal for a galvanically isolated current monitor. The isolation barrier is suitable for
voltages up to 100 V and prevents unwanted ground loops.
5 V LED
HV LED
