MDS-040APS18BA Datasheet, PDF (9/11 Pages) Delta Electronics, Inc. – MDS Medical AC-DC Open Frame

TECHNICAL DATASHEET
MDS Medical AC-DC Open Frame
18V 40W / MDS-040APS18 BA
Dynamic Response
The power supply output voltage will remain within ±3% of its
steady state value, when subjected to a dynamic load 50 to
100% of its rated current.
■ 50 to 100% Load
100% Load
The power supply’s Overload (OLP) and Over current (OCP)
Protections will be activated when output current between150%
and 210% of IO (Max load). In such occurrence, the VO will start to
drop 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.
Output Voltage (Vo)
Load < 210%
(Output Hiccup)
50% Load
50ms 50ms 50ms 50ms
T (sec)
Inrush Current
Inrush current is the peak, instantaneous, input current measured
and, occurs when the input voltage is first applied. For AC input
voltages, the maximum peak value of inrush current will occur
during the first half cycle of the applied AC voltage. This peak
value decreases exponentially during subsequent cycles of AC
voltage.
0% Load
150% Load
T (sec)
Additionally, if the IO is <150% 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 latch mode until
the fault is removed and the mains is reapplied.
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 higher than the operating temperature. When
activated, the output voltage will go into latch mode until the main
is reapplied and the surrounding air temperature drops to its
normal operating temperature.
Overvoltage Protection
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”. Power
supply will latch off, and require removal/re-application of input
AC voltage in order to restart.
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
removed.
9
All parameters are specified at 25°C ambient unless otherwise noted.
www.DeltaPSU.com (July 2013, Rev. 00)