NEB-D datasheet(21/36 Pages) CUI

21 / 36 page

cui.com

date 06/10/2016

│ page 21 of 36

CUI Inc

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

Operating Information

Power Management Overview

This product is equipped with a PMBus interface to to

allow the product to be configured,and communicate

with system controllers. The product incorporates a wide

range of readable and configurable power management

features that are simple to implement with a minimum of

external components. Additionally, the product includes

protection features that continuously safeguard the load

from damage due to unexpected system faults. A fault is

also shown as an alert on the SALERT pin. The following

product parameters can continuously be monitored by a

host: Input voltage, output voltage/current, duty cycle and

internal temperature.

The product is delivered with a default configuration

suitable for a wide range operation in terms of input

voltage, output voltage, and load. The configuration is

stored in an internal Non-Volatile Memory (NVM). All

power management functions can be reconfigured using

the PMBus interface. Please contact your local CUI Power

Modules representative for design support of custom

configurations or appropriate SW tools for design and

down-load of your own configurations.

Input Voltage

Remote Control (secondary side)

The NEB consists of two different product families designed

for two different input voltage ranges, 36 to 75 Vdc and 40

to 60 Vdc, see ordering information.

The input voltage range 36 to 75 Vdc meets the

requirements of the European Telecom Standard ETS 300

132-2 for normal input voltage range in –48 and –60 Vdc

systems, -40.5 to

-57.0 V and –50.0 to -72 V respectively.

At input voltages exceeding 75 V, the power loss will be

higher than at normal input voltage and TP1 must be

limited to absolute max +125°C. The absolute maximum

continuous input voltage is 80 Vdc.

The input voltage range 40 to 60 Vdc meets the

requirements for normal input voltage range in -48 V

systems, -40.5 to

-57.0 V. At input voltages exceeding 60 V, the power

loss will be higher than at normal input voltage and TP1

must be limited to absolute max +125°C. The absolute

maximum continuous input voltage is 65 Vdc.

The CTRL-pin can be configured as remote control via the

PMBus interface. In the default configuration the CTRL-

pin is disabled and floating. The output can be configured

to internal pull-up to 3.3 V using the MFR_MULTI_PIN_

CONFIG (0xF9) PMBus command. The CTRL-pin can be left

open when not used. The logic options for the secondary

remote control can be positive or negative logic. The logic

option for the secondary remote control is configured

via ON_OFF_CONFIG (0x02) command using the PMBus

interface, see also MFR_MULTI_PIN_CONFIG section.

Turn-off Input Voltage

The product monitors the input voltage and will turn

on and turn off at predetermined levels. The minimum

hysteresis between turn on and turn off input voltage is

2 V. The turn on and turn off levels of the product can be

reconfigured using the PMBus interface

Remote Control (RC)

The products are fitted with a configurable remote control

function. The primary remote control is referenced to the

primary negative input connection (-In). The RC function

allows the converter to be turned on/off by an external

device like a semiconductor or mechanical switch. The RC

pin has an internal pull up resistor. The remote control

functions can also be configured using the PMBus

The device should be capable of sinking

0.7 mA. When the RC pin is left open,

the voltage generated on the RC pin

is max 6 V. The standard product is

provided with “negative logic” remote

control and will be off until the RC pin

is connected to the

-In. To turn on the product the voltage

between RC pin and -In should be less

than 1 V.

To turn off the product the RC pin should be left open for

a minimum of time 150 µs, the same time requirement

applies when the product shall turn on. In situations where

it is desired to have the product to power up automatically

without the need for control signals or a switch, the RC

pin can be wired directly to –In or disabled via the 0xE3

command. The logic option for the primary remote control

is configured via 0xE3 command using the PMBus.

Input and Output Impedance

The impedance of both the input source and the load will

interact with the impedance of the product. It is important

that the input source has low characteristic impedance.

Minimum recommended external input capacitance is 100

µF. The performance in some applications can be enhanced

by addition of external capacitance as described under

External Decoupling Capacitors.

External Decoupling Capacitors

When powering loads with significant dynamic current

requirements, the voltage regulation at the point of load

can be improved by addition of decoupling capacitors at

the load. The most effective technique is to locate low ESR

ceramic and electrolytic capacitors as close to the load

as possible, using several parallel capacitors to lower the

effective ESR. The ceramic capacitors will handle high-

frequency dynamic load changes while the electrolytic

capacitors are used to handle low frequency dynamic load

changes. Ceramic capacitors will also reduce any high

frequency noise at the load. It is equally important to

use low resistance and low inductance PWB layouts and

cabling. External decoupling capacitors will become part of

For more information, please visit the product page.

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

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