Medical AC-DC Enclosed Power Supply

24V 200W 2”x4” High Density MDS-200ADB24 AA

10

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

Overload & Overcurrent Protections

The power supply’s Overload (OLP) and Overcurrent (OCP)

Protections will be activated before output current under 160% of

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 OLP and OCP is removed

Additionally, if the Iout is <160% 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. Then, the power supply will be latched off,

and require recycling of input voltage to restart it.

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 temperature 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 input

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

temperature drops to its normal operating temperature.

Power Good

Power Good+ pin is an open collector transistor (40V/600mA

rating). A resistor (suggested value 20Kohm, 1/8W) can be added

between output pin (or, other available pull-up voltage that is no

greater than 30V) and the Power Good+ pin (refer to figure

below). Value of pull-up resistor may have to be adjusted,

depending on voltage used, and other end-use conditions of the

Power Good+ pin connection to the product. When AC input is

on, Power Good+ pin will be high. When AC input is off, Power

Good+ pin will be low. There will be a minimum of 5 milliseconds

(at 120W load) between the time the power good goes to low

level, and the time when the output reaches 90% of its rated

value.

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

(November 2016, Rev. 01)