4

TET2000 Series

tech.support@psbel.com

Figure 3. Power Factor vs. Load

Figure 4. Power Factor vs. Load

4.3 INPUT UNDER-VOLTAGE

If the RMS value of input voltage (either AC or DC) stays below the input undervoltage lockout threshold

inhibited. Once the input voltage returns within the normal operating range, the supply will return to normal operation again.

4.4 POWER FACTOR CORRECTION

Power factor correction (PFC) (see

Figure 3) is achieved by controlling the input current waveform synchronously with the input

voltage. A fully digital controller is implemented giving outstanding PFC results over a wide input voltage and load ranges. The

input current will follow the shape of the input voltage. If for instance the input voltage has a trapezoidal waveform, then the

current will also show a trapezoidal waveform. At DC input voltage the PFC is still in operation, but the input current will be DC

in this case.

4.5 EFFICIENCY

The high efficiency (see

Figure 4) is achieved by using state-of-the-art GaN power devices in conjunction with soft-transition

topologies minimizing switching losses and a full digital control scheme. Synchronous rectifiers on the output reduce the

losses in the high current output path. The rpm of the fan is digitally controlled to keep all components at an optimal

operating temperature regardless of the ambient temperature and load conditions.

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Po [W]

Vi=230Vac

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Vi=230Vac,FAN Internal