TECHNICAL DATASHEET

PMT Panel Mount Power Supply

12V 50W 1 Phase / PMT-12V50W1AA

9

|

www.DeltaPSU.com (August 2012, Rev. 00)

Overload & Overcurrent Protections

The power supply’s Overload (OLP) and Overcurrent (OCP) Protections will be activated when output current exceeds 150% of I

In such occurrence, the V

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 I

0% Load

150% Load

t (sec)

Output Voltage (V

O

)

Load >150%

(Output Hiccup)

Additionally, if the I

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.

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”.

Max OVP Level

Variable O/P Voltage Range

Typical Overvoltage Condition as seen at the O/P

OVP

Zero Output

Nominal

O/P Voltage

Auto-Recovery

to Normal

Output Voltage

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 >80°C. When activated,

the output voltage will go into bouncing mode until the operating

surrounding air 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 removed.