Inrush Current is the first surge current seen on the input side
when AC input is applied to the power supply. It is the first pulse
captured; see a typical picture for the inrush current as seen in
the power supply.
The power supply output voltage will remains within ±5% of its
steady state value, when subjected to a dynamic load from 5% to
100% of its rated current.
50% duty cycle / 5Hz to 1KHz
The power supply’s overvoltage circuit will be activated when its
internal feedback circuit fails. The output voltage shall not exceed
its specifications defined on Page 3 under “Protections”.
Overload & Overcurrent Protections
The power supply’s Overload (OLP) and Over current (OCP)
Protections will be activated when output current exceeds 120%
of IO (Max load). In such occurrence, the VO will start to droop and
once the power supply has reached its maximum power limit, the
protection is activated and the power supply will go into “Hiccup
mode” (Auto-Recovery). The power supply will recover once the
fault condition of the OLP and OCP is removed and IO is back
within the specifications.
Additionally, if the IO is < 120% but > 100% for a prolong period of
time (depending on the load), the Over Temperature Protection
(OTP) will be activated due to high temperature on critical
components. The power supply will then go into “Hiccup mode”
until power supply cool down.
Over Temperature Protection
As mentioned above, the power supply also has Over
Temperature Protection (OTP). This is activated when the
overload condition persists for an extended duration and the
output current is below the overload trigger point but > 100% load.
In the event of a higher operating condition at 100% load, the
power supply will run into OTP when the surrounding air
temperature is > 75°C. When activated, the output voltage will go
into bouncing mode until the operating surrounding temperature
drops to 50°C or output capacity is reduced as recommended in
the de-rating graph.
Short Circuit Protection
The power supply’s output OLP/OCP function also provides
protection against short circuits. When a short circuit is applied,
the output current will operate in “Hiccup mode”, as shown in the
illustration in the OLP/OCP section on this page. The power
supply will return to normal operation after the short circuit is