NEB-N datasheet(21/30 Pages) CUI

21 / 30 page

cui.com

date 11/07/2014

│ page 21 of 30

CUI Inc

│ SERIES: NEB-N │ DESCRIPTION: FULLY REGULATED ADVANCED BUS CONVERTERS

Temperature Protection (OTP, UTP) (Continued)

automatically when the temperature has dropped below

the temperature threshold; the hysteresis is defined in

general electrical specification. The product also has an

under temperature protection.

Over Voltage Protection (OVP)

The product includes over voltage limiting circuitry for

protection of the load. The OVP limit is 30% above the

nominal output voltage.

The response from an over voltage fault is to immediately

shut down. The device will continuously check for the

presence of the fault condition, and when the fault

condition no longer exists the device will be re-enabled.

Over Current Protection (OCP)

The product includes current limiting circuitry for

protection at continuous overload. The setting for the

product is hic-up mode if the maximum output current

is exceeded and the output voltage is below 0.3×Vout.

Above the trip voltage the product will continue to

operate while maintaining the output current at the

maximum output current. The load distribution should be

designed for the maximum output short circuit current

specified.

Droop Load Share variants (DLS) will enter hic-up mode,

with a trip voltage, 0.04×Vout. Above the trip voltage the

product will continue to operate while maintaining the

output current at the maximum output current.

Input Over/Under voltage protection

The input of the product is protected from high input

voltage and low input voltage.

Pre-bias Start-up Capability

The product has a Pre-bias start up functionality and will

not sink current during start up if a Pre-bias source is

present at the output terminals. If the Pre-bias voltage

is lower than the target value, the product will ramp up

to the target value. If the Pre-bias voltage is higher than

the target value, the product will ramp down to the target

value and in this case sink current for a limited time.

Output Voltage Regulation

The NEB products are designed to be fully regulated

within the plotted area. Operating outside this area is not

recommended.

12.0

12.2

12.4

12.6

12.8

13.0

13.2

13.4

Vin [V]

Vin range: 36-75Vdc

12.0

12.2

12.4

12.6

12.8

13.0

13.2

13.4

35 40 45 50 55 60 65

Vin [V]

Vin range:40-60Vdc

Thermal Consideration

General

The product is designed to operate in different thermal

environments and sufficient cooling must be provided to

ensure reliable operation. For products mounted on a PWB

without a heat sink attached, cooling is achieved mainly by

conduction, from the pins to the host board, and convection,

which is dependant on the airflow across the product.

Increased airflow enhances the cooling of the product. The

Output Current Derating graph found in the output section for

each model provides the available output current vs. ambient

air temperature and air velocity at VI =53 V. The product is

tested on a 254 x 254 mm, 35 µm (1 oz), 16-layer test board

mounted vertically in a wind tunnel with a cross-section of

608 x 203 mm

For products with base plate used in a sealed box/cold wall

application, cooling is achieved mainly by conduction through

the cold wall. The Output Current Derating graphs are found

in the output section for each model. The product is tested in

a sealed box test set up with ambient temperatures 85, 55

and 25°C.

For more information, please visit the product page.

NEB-N Datasheet(PDF) 21 Page - CUI INC

NEB-N Datasheet(HTML) 21 Page - CUI INC

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

Datasheet Download

Link URL