| Inrush current |
Rush current will
flow into power supply unit once city utility is
applied. |
| Output voltage accuracy |
Power supply unit output voltage volume is under
rated load condition. |
| Ripple and Noise |
Ripple voltage will be caused
by input electrolytic capacitor charging and discharging.
And power supply unit internal circuit of P.W.M
(Pulse Width Modulation) turns switching MOSFET
on and off to cause some voltage spike. Both ripple
voltage and spike voltage affect power supply unit
voltage various. |
| Turn on delay time |
Duration of AC applies to power
supply unit, and power supply unit output voltage
reaches to 90% of rated voltage. |
| Hold up time |
Duration of power supply unit
output voltage drops down to 90% of rated voltage
from AC removal. |
| Transfer efficiency |
Percentage of output power divides
by input power. It means Pout / Pin * 100% |
| Load regulation |
Output voltage volume varies
when it is light load, half load or full load. |
| Input line regulation |
Output voltage volume change
is affected by input AC voltage vary. |
| Output overshoot |
Power supply unit output voltage
overshoot following a rising edge when AC is applied. |
| Rising time |
Duration of power supply unit
output voltage rises from 10 % to 90%. |
| Falling time |
Duration of power supply unit
output voltage falls from 90 % to 10%. |
| Dynamic load |
Power supply unit output voltage
varies under dynamic load (load value is shown on
specification). |
| Peak load |
Maximum load capacity from power
supply unit in specified duration. |
| Rated load |
Rated load capacity shows on
the label of power supply unit. Power supply unit
must guarantee its performance and reliability to
meet its specification. |
| Over voltage protection |
In case power supply unit output
voltage exceeds its rated output voltage range and
reaches specified voltage, power supply unit must
turn off the output to protect system. |
| Over current protection |
When voltage volume from power
supply unit exceeds system default set up due to
the system damages, power supply unit must turn
off its output to against system damaged. |
| Operating temperature
range |
Under specified temperature
range, power supply unit must work normally and
its performance must be guaranteed. |
| Storage temperature range |
Under specified storage temperature
range, power supply unit shape should not be changed. |
| Operating humidity range |
Under specified humidity range,
power supply unit must work normally and its performance
must be guaranteed. |
| Mean Time Between Fault(MTBF) |
Mean time between fault of power
supply unit under normal operating. |
| De-rating |
Percentage of real power dispassion
divides by rated power dispassion for power supply
unit internal component. |
| Thermal curve |
Curve of temperature be measured
from power supply unit component under normal operating. |
| Downgrade operating |
Power supply unit should reduce
its output power if ambient temperature exceeds
specified range. |
| Load curve |
Curve of power supply unit outputs
current capacity and temperature. |
