02001026
Rev 1 ECO 7062
Operation Manual:
LDD-100/150/250-XX-YY
Page 4 of 13
Instead of running the inverter in a traditional PWM mode, the inverter is run in a
phase shift mode. With the appropriate output inductor and the appropriate
capacitance across each switching device, in this case MOSFETS, there are
virtually no switching losses in the inverter. The only losses in the devices are I
2
R
losses associated with the Drain/Source resistance of the MOSFETS. Therefore,
the ZVS inverter also contributes to reduced losses, reduce EMI noise and a
reduction in overall system heatsink requirements.
Output Circuit
The output filter is a single stage RC filter designed to keep ripple and output
noise very low.
Control Circuit
The control circuit handles all the responsibilities associated with safe operation of
the laser diode. Controlled rise and fall times, as well as tight current regulation,
overvoltage and over power protection are controlled and monitored in the
control circuit.
Auxiliary Power
All internal power supply requirements as well as the ex/-15V
and +5V power supplies are derived from the power factor control
boost inductor. All auxiliary power supplies are regulated by standard
linear regulators
Figure 1
LDD-100/150/250 Block Diagram
