Universal driver, suitable for advanced q-switching, beam slicing, pulse picking.
QBU-10kV-series is specially designed to control Pockels cells by applying a fast switching high voltage. The modules require +24 V DC power supply and pulse generator to set an operating frequency and pulse width. An output voltage level can be programmed in working range by user either manually (through onboard configuration trimpot) or remotely (applying a DC voltage to the respective pin). The module is an extension of QBU-series operating voltage range up to 10 kV (bipolar).
Different operating modes by output signal form are possible:
• push-up (= normally off scheme), when a base voltage level equals to zero
• pull-down (= normally on scheme), when pulses are generated from base bias voltage to ground.
• user-defined scheme, with arbitrary width and frequency of pulses
The desired one could be managed by user ajusting a pulse generator correspondingly.
QBU-10kV-series is based on MOSFET technology and offers high repetition rates and fast transition time for both pulse edges
(< 20 ns rise time / < 25 ns fall time).
For instance, QBU-10kV maximum repetition rate* in dependence on output voltage and cooling conditions, when total load capacitance 11pF and ambient temperature 25 °C, represents as follows:
| Output voltage, kV | Repetition rate, kHz (conductive cooling) | Repetition rate, kHz (appropriate forced-air cooling) |
|---|---|---|
| 3.00 | >25 | >75 |
| 4.00 | >15 | >50 |
| 5.00 | >10 | >30 |
| 6.00 | >7.5 | >25 |
| 7.00 | >5 | >20 |
| 8.00 | >4 | >15 |
| 9.00 | >3 | >10 |
| 10.0 | >2 | >7 |
(*) The actual performance depends on actual load capacitance and cooling conditions.
In the burst mode (= short time operation) the performance increases approximately twice and can reach 100kHz value at low operating voltage and low load capacitance.
The performance deteriorates for higher load capacitance.
(QBU-7028, 5.509V at PIN8, 3.7kV output)
(*) Other output voltages are available on request
