PKB4113CPI datasheet(34/43 Pages) ERICSSON

34 / 43 page

Ericsson Internal

PRODUCT SPECIFICATION

2 (6)

Prepared (also subject responsible if other)

No.

ESHUHAN

3/1301-BMR 655 Uen

Approved

Checked

Date

Rev

Reference

SEC/D (Betty Wu)

EZHEWNG

2009-2-13

Operating information

Input Voltage

The input voltage range 36 to 75Vdc 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 +90°C. The absolute maximum continuous input

voltage is 80 Vdc.

Turn-off Input Voltage

The DC/DC converters monitor 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 1V.

Remote Control (RC)

The products are fitted with a

remote control function referenced

to the primary negative input

connection (- In), with negative and

positive logic options available. 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 to + In.

The maximum required sink current is 1 mA. When the RC pin

is left open, the voltage generated on the RC pin is

4 – 6 V. The second option is “positive logic” remote control,

which can be ordered by adding the suffix “P” to the end of the

part number. The converter will turn on when the input voltage

is applied with the RC pin open. Turn off is achieved by

connecting the RC pin to the - In. To ensure safe turn off the

voltage difference between RC pin and the - In pin shall be

less than 1V. The converter will restart automatically when this

connection is opened.

See Design Note 021 for detailed information.

Input and Output Impedance

The impedance of both the input source and the load will

interact with the impedance of the DC/DC converter. It is

important that the input source has low characteristic

impedance. The converters are designed for stable operation

without external capacitors connected to the input or output.

The performance in some applications can be enhanced by

addition of external capacitance as described under External

Decoupling Capacitors. If the input voltage source contains

significant inductance, the addition of a 100 µF capacitor

across the input of the converter will ensure stable operation.

The capacitor is not required when powering the DC/DC

converter from an input source with an inductance below

10 µH.

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 PCB layouts and cabling.

External decoupling capacitors will become part of the control

loop of the DC/DC converter and may affect the stability

margins. As a “rule of thumb”, 100 µF/A of output current can

be added without any additional analysis. The ESR of the

capacitors is a very important parameter. Power Modules

guarantee stable operation with a verified ESR value of >10

across the output connections.

For further information please contact your local Ericsson

Power Modules representative.

Output Voltage Adjust (Vadj)

The DC/DC converters have an Output Voltage Adjust pin

(Vadj). This pin can be used to adjust the output voltage above

or below Output voltage initial setting.

When increasing the output voltage, the voltage at the output

pins (including any remote sense compensation ) must be

kept below the threshold of the over voltage protection, (OVP)

to prevent the converter from shutting down. At increased

output voltages the maximum power rating of the converter

remains the same, and the max output current must be

decreased correspondingly.

To increase the voltage the resistor should be connected

between the Vadj pin and +Sense pin. The resistor value of the

Output voltage adjust function is according to information

given under the Output section for the respective product.

To decrease the output voltage, the resistor should be

connected between the Vadj pin and –Sense pin.

PKB4000C series Direct Converters

Input 36-75 V, Output up to 60 A / 144 W

EN/LZT 146 377 R4

D September 2013

Technical Speciﬁcation

PKB4113CPI Datasheet(PDF) 34 Page - Ericsson

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