TECHNICAL DATASHEET

MDS Medical AC-DC Adapter

15Volt, 90Watt / MDS-090AAS15 F/B

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All parameters are specified at 25°C ambient unless otherwise noted.

www.DeltaPSU.com (November 2016, Rev. 03)

9

Dynamic Response

Inrush Current

Inrush current is the input current that 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.

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 4

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.

Overload & Over current Protections

The power supply’s Overload (OLP) and Over current (OCP)

Protections will be activated when output current is between

will start to drop. Once the power supply has reached its

maximum power limit, the protection will be activated. and the

power supply will go into “Hiccup mode” (Auto-Recovery). The

power supply will recover once the fault condition causing the

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

the fault is removed; and, the input voltage is removed, then

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 hiccup mode until the

input voltage is removed; then, reapplied, and the surrounding air

temperature drops to its normal operating temperature.

50% Load

T (sec)

100%

Load

50ms

50ms

50ms

50ms

The power supply output voltage will remain within ±5% of its

steady state value, when subjected to a dynamic load change

from 50 to 100% of its rated current.