PKB4610PI - Ericsson, Inc.

DC/DC Converter

48V Input, 3.3V at 20A Output

The PKB 4000 Series of high efficiency DC/DC

converters are designed to provide high quality

on-board power solutions in distributed power

architectures used in "Inter-networking" equip-

ment in Wireless and Wired Communications and

Datacom applicications. The PKB 4000 Series has

the same pinout as an industry standard quarter

brick but only occupies approx-imately half the

footprint. This makes it extremely well suited for

limited board space applications. The PKB Series

uses patented syn-chronous rectification

technology and achieves an efficiency up to 90%

at full load. The series is presently available in

non-baseplated versions and will be offered in

baseplated and surface mount versions in the near

future. Ericsson's PKB 4000 Series addresses the

emerging telecom market for applications in the

multi-service network by specifying the input

voltage range in accordance with ETSI

specifications.

Included as standard features are over-voltage

protection, under-voltage protection, over

temperature protection, soft-start, short circuit

protection, remote sense, remote on/off, and

industry standard output trim adjustment. The

PKB 4000 Series also offers the flexibility of using

a baseplate as well as an optional heatsink when

needed, enabling reduced airflow, extended

reliability, and higher ambient temperature

operation.

These converters are manufactured in highly

automated manufacturing lines and meet world-

class quality levels. Ericsson Power Modules has

been an ISO 9001 certified Supplier since 1991.

•High Efficiency; 90% Typ. at 20A

92.4% at 10A

• 1/8th brick pkg: low profile 58 x 19 mm2

(2.28 x 0.75 in2)

• Pin compatible replacement for Industry-

standard quarter brick

•2,250 Vdc isolation and meets Isolation

Requirements equivalent to Basic Insula-

tion according to IEC/EN 60 950

•Fast Dynamic Response, ttr = 50 us

• More than 3.7million hours predicted

MTBF

•UL/ULC 1950, UL/ULC 60 950 Recognized

and TUV Type Certified as per EN 60 950

PKB 4610 PINB

Features

Product shown is the PKB 4610 PINB

2EN/LZT 108 6067 R1D ©Ericsson Inc., Power Modules , November 2002

PKB 4610 PINB

General Safety

The PKB 4000 PI Series DC/DC converters

are designed in accordance with North

American and International Safety Regulatory

Agency Requirements per IEC/EN 60 950,

Standards for Safety of Information Technology

Equipment.

The PKB 4000 Series DC/DC converters are

Recognized by UL and CSA in accordance

with ULC 1950 and ULC 60 950 and are

TUV Type Certified as per EN 60 950.

The DC/DC converters should be installed in

end-use equipment, in compliance with the

requirements of the ultimate application. If

the input is 75Vdc or less, then all the

outputs remain SELV under normal and

abnormal operating conditions. However,

when the supply voltage exceeds 60Vdc,

minimum Basic Insulation must be provided

in accordance with IEC 60 950, isolating the

input power supply from the AC mains.

Single fault testing in the input power supply

circuit should be performed with the DC/DC

converter connected to demonstrate that the

input voltage does not exceed 75Vdc. If the

input power suplly circuit is a DC power

system, the source maybe treated as a TNV2

circuit and testing has demonstrated

compliance with SELV limits and isolation

requirements equivalent to Basic Insulation in

accordance with IEC/EN/UL 60 950.

It is recommended that a fast blow fuse with a

rating of 5A be used at the input of each

PKB converter. However, the converters are

approved for a maximum fuse rating of 15A.

If a fault occurs in the converter that imposes

a short on the input source, this fuse will

provide the following two functions:

• Isolate the failed converter from the input

source so that the remainder of the system

may continue operation.

• Protect the distribution wiring from

overheating.

Note:

Stress in excess of Absolute Maximum Ratings may cause permanent damage. Absolute Maximum Ratings,

sometimes referred to as "no destruction limits", are normally tested with one parameter at a time

exceeding the limits of the Output data or Electrical Characteristics.

VRC

Absolute Maximum Ratings

TPcb Maximum Operating Pcb Temperature

–

40 +110 °C

TSStorage temperature

–

40 +125 °C

VI Input voltage

–

0.5 +80 Vdc

VISO

2,250 Vdc

Isolation voltage (input to output test voltage)

I2tInrush transient 1 A2s

0 12 Vdc Remote control voltage (5Vdc typical)

Characteristics min max Unit

Note:

1) The input voltage range 36...75 V meets the requirements in the European Telecom Standard prETS 300

132-2 for Normal input voltage range in 48 V and 60 V DC power systems, –40.5...–57.0 V and –50.0...–72.0 V

respectively.

V I Input voltage range1)

IO = 0...IOmax

36 75 Vdc

V Ioff Turn-off input voltage Ramping from higher 30 31.5 33 Vdc

voltage

V Ion Turn-on input voltage Ramping from lower 33 34.5 36 Vdc

voltage, IO = 0...IOmax

C I Input capacitance 2.18 uF

IIac 10 mAp-p

Input TPcb < TPcb max

VTRIM Maximum input voltage 6.6 Vdc

on trim pin

IImax Maximum input current VI = VImin, 66 W 2.25 A

Reflected ripple current 5 Hz to 20 MHz

Characteristics Conditions min typ max Unit

IO =0, VI = 53 V

1.1 2 W

Input idling power

PIi

Input stand-by power

(turned off with RC)

VI=53V, RC open 0.05 0.1 WPRC

VTrans Input Voltage Transient

80 Vdc

Environmental Characteristics

Random IEC 68-2-34ED Frequency 10...500 Hz

Vibration Spectral density 0.025 g2/Hz

Duration 10 min each direction

Frequency 10...500 Hz

Amplitude 0.75mm

Acceleration 10g

Number of cycles 10 in each axis

Characteristics

Sinusoidal

Vibration

IEC 68-2-6 Fc

Shock

(Half sinus)

IEC 68-2-27 Ea Peak acceleration 100g

Temperature

change

IEC 68-2-14 Na

Accelerated

damp heat

Solder

resistability

IEC 68-2-3 Ca

with bias

IEC 68-2-20 Tb 1A

Resistance to

cleaning solvents

IEC 68-2-45 XA

Method 1

Duration 3ms

Temperature -40°C… +125°C

Number of cycles 300

Temperature, solder 260°C

Duration 10…13 s

Temperature 85°C

Humidity 85% RH

Duration 1000 hours

Water +55 ±5°C

Isopropyl alcohol +35 ±5°C

Method with rubbing

Test procedure & conditions

The galvanic isolation is verified in an electric

strength test. The test voltage (VISO) between

input and output is 2250 Vdc for 60 seconds.

Leakage current is less than 1uA.

EN/LZT 108 6067 R1D ©Ericsson Inc., Power Modules , November 2002

PKB 4610 PINB

Mechanical Data

PKB 4610 PI Maximum 25 g (est.)

PKB 4610 PINB Maximum 20 g

Weight

Material: Brass Alloy

Plating: Tin over Nickel

Pins

Electrical Data

Primary Secondary

Control

Isolated

Feedback

Choke

Resistor

Capacitor

Control

Fundatmental Circuit Diagram

Connections

Pin Designation Function

1 - INPUT Negative input

2 RC Remote on/off (primary) to

turn-on and turn-off the output

3 + INPUT Positive input.

4 - OUTPUT Negative output

5 - SENSE Negative remote sense

6 TRIM Output voltage adjust

7 + SENSE Positive remote sense

8 + OUTPUT Positive output

• If the remote control is not needed

the RC pin must be connected to -Vin

for negative logic.

For positive logic the pin should be

left open or floating.

Note:

• If the remote sense is not needed the

"-Sense" should be connected to "-Out"

and the "+Sense" should be connected

to "+Out."

Class B External Input EMI Filter Circuit Diagram

Output

+ +

PKB

Module

- -

Vin 36-75Vdc

CD3

CYS1

CY4 CY2

CY3 CY1

Cin

CD1

CD2

CYS2

The following external input filter is required to meet EN55022 Class B

EMI requirements. Please refer to Design Note 19 for further information.

Filter Schematic Legend:

Cin: 100uF/100V, Electrolytic capacitor

CY1, CY2, CYS1, CYS2: 2700pF/

2000V Ceramic capacitors

CY3, CY4: 2 x 2700pF/2000V Ceramic

capacitors

CD1, CD2: 4 x 1uF/100V Ceramic

CD3: 2 x 1uF/100V Ceramic

L1, L2: common mode inductor, 1.5mH,

each winding consists of 13 turns of

AWG #21wire on the T18-10-10E

HS72 core from TDK

4EN/LZT 108 6067 R1D ©Ericsson Inc., Power Modules , November 2002

PKB 4610 PINB

TPcb = –40…+100°C, VI = 36 ...75V unless otherwise specified.

Output

typ

max

Miscellaneous

85%

86%

87%

88%

89%

90%

91%

92%

93%

94%

0 5 10 15 20

C u r r e n t ( A )

Efficiency (%)

36V

53V

75V

Efficiency Output Current Derating

50 µs

30 40 ms

0 20 A

Conditions Output

min typ max Unit

Output voltage initial

setting and accuracy

TPcb =+25°C, VI = 53 V, I

O =IOmax

VOi

Output voltage

tolerance band

Load regulation VI = 53V, IO=0 to I

Omax,

Vt r

Load transient

recovery time

tt r

Start-up time

tsFrom VI connection to VO= 0.9 × VOnom

Output currentIO

Max output powerPOmax

Current limit thresholdIlim VO = 0.96 VOnom

Short circuit currentIsc

f < 1kHz

Output ripple & noise

Supply voltage

rejection (ac)

SVR

Line regulation IO=IOmax

Load transient

voltage deviation

3.27 3.30 3.33 V

3 10 mV

66 W

22 24 26 A

25 28 30 A

60 100 mVp-pVOac

55 dB

+/-350 mV

IO=IOmax, f < 20 MHz

IO=0 to IOmax

3 10

Output adjust range 2.64 3.63 V

Load step = 0.25...0.75...0.25 x IOmax

di/dt = 8A/us

OVP Over voltage protection 3.9 4.4 5.0 V

3.23 3.37 V

At VO = V

Onom

VI= 53 V

IO =IOmax

Characteristics

Characteristics Conditions Unit

min typ max

fS Switching frequency IO = 0...1.0 x IOmax 160 kHz

η Efficiency - 50% Load IO = IOmax, VI = 53V, TPcb = +25oC 92.4 %

Pd Power dissipation IO = IOmax, VI = 53V, TPcb = +25oC 6.9 W

η Efficiency - 100% Load IO = IOmax, VI = 53V, TPcb = +25oC 89.7 %

TA = +25oCVI = 53V

20 30 40 50 60 70 80 90 100

A m b I e n t T e m p e r a t u r e ( C )

Output Current (A)

3 m/s

2.5 m/s

2 m/s

1.5 m/s

1 m/s

0.5 m/s

Nat. Conv

EN/LZT 108 6067 R1D ©Ericsson Inc., Power Modules , November 2002

PKB 4610 PINB

Output Characteristic (typ)

0 5 10 15 20

C u r r e n t ( I o )

Power Loss W

U I n 3 6 V

U I n 4 8 V

U I n 5 3 V

U I n 7 5 V

0.5

1.5

2.5

3.5

20 22 24 26 28

C u r r e n t ( A )

Voltage

Uin 36V

Uin 48V

Uin 53V

Uin 75V

Power Dissipation

TA = +25oC

Start-up

TA = +25oC, IO = 20A, Vin = 53V

(Load >2A or a capcitor > 220uF) TA = +25oC, IO = 20A, Vin = 53V

Turn-Off

TA = +25oC, IO = 20A, Vin = 53V

Output Ripple Transient

TA = +25oC, IO = 5-10-5A, Vin = 53V

6EN/LZT 108 6067 R1D ©Ericsson Inc., Power Modules , November 2002

PKB 4610 PINB

100

1000

10000

100000

0246810 12 14 16 18 20 22 24

C h a n g e i n O u t p u t V o l t a g e ( ∆

% )

Adjust Resistor Value (KOhm)

D e c r e a s e

I n c r e a s e

Output Volge Trim for 3.3V

Operating Information

Input Voltage

The input voltage range 36...75Vdc meets the

requirements of the European Telecom Standard ETS 300

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

DC power systems, -40.5...-57.0V and -50.0...-72V

respectively. At input voltages exceeding 75V, the power

loss will be higher than at normal input voltage and TC

must be limited to absolute max +110oC. The absolute

maximum continuous input voltage is 80V DC.

The converter will compensate for up to 0.5V voltage

drop between the sense voltage and the voltage at the

power module output pins. The output voltage and the

remote sense voltage offset must be less than the

minimum over voltage trip point.

To increase VO connect RTRIM-UP from +SENSE to TRIM

Remote ON/OFF (RC)

The PKB 4000 series DC/DC converters have two remote

on/off options available. The standard converter is

provided with "negative logic" remote on/off. The

negative logic remote on/off turns the converter off during

a logic high voltage on the on/off pin and on during a

logic low state. The second option is "positive Logic"

remote on/off which can be ordered by adding the suffix

"P" to the end of the part number such as PKB 4610 PIP.

"Positive logic" remote on/off turns the converter on

during a logic high and off during a logic low state.

Low ON

Open/High OFF

RC (primary) Module

Standard Remote Control Optional (P) Remote Control

Low OFF

Open/High ON

RC (primary) Module

The remote on/off is referenced to the primary side. A

mechanical switch or an open collector transistor or FET

must be provided between the -Vin and the remote on/off

inputs to drive the RC inputs to turn the module on and

off.

In situations where it is desired to have the converter

power up automatically without the need for control

signals or a switch, the RC pin can be wired directly to the

-Input circuit on the application board.

( )

RTRIM-UP =5.11 kΩ

( )

VO (100+∆%) (100+2∆%)

1.225∆% ∆%

All PKB 4000 series DC/DC converters include current

limiting circuitry that allows them to withstand

continuous overloads or short circuit conditions on the

output. The output voltage will decrease towards zero for

output currents in excess of max output current (IOmax).

The converter will resume normal operation after removal

of the overload. The load distribution system should be

designed to carry the maximum short circuit output

current specified.

Current Limiting

Over Voltage Protection (OVP)

The PKB 4000 series DC/DC converters latching output

overvoltage protection. In the event of an overvoltage

condition, the converter will shut down. The converter

can be restarted by cycling the input voltage.

Remote Sense

The remote sense circuitry will compensate for moderate

amounts of resistance in the distribution system and allow

for voltage regulation at the load or other selected point.

The remote sense lines will carry very little current and do

not need a large cross sectional area. However, the sense

lines on a pcb should be located close to a ground trace or

ground plane. In a discrete wiring situation, the use of

twisted pair wires or other technique to reduce noise

susceptibility is highly recommended.

Output Voltage Adjust (Trim)

All PKB 4000 series DC/DC converters have an Output

Voltage Adjust pin (Trim). This pin can be used to adjust

the output voltage above or below VOi. When increasing

the output voltage, the voltage at the output pins

(including any remote sensing offset) must be kept below

the overvoltage trip point. Also note that at elevated

output voltages the maximum power rating of the

module remains the same, and the output current

capability will decrease correspondingly. These converters

trim according to the industry standard method.

To decrease VO connect RTRIM-DOWN from -SENSE to

TRIM

RTRIM-DOWN =5.11 kΩ

100

∆%- 2

PKB 4610 PINB

Input and Output Impedence

converters have been designed to be completely stable

without the need for external capacitors on the input or the

output circuits. The performance in some applications can

be enhanced by the addition of external capacitance as

described below. If the distribution of the input voltage

source to the converter contains significant inductance, the

addition of a 100uF capacitor across the input of the

converter will help insure stability. This capacitor is not

required when powering the converter from a low

impedence source with a short, low inductance, input

power leads.

The PKB 4000 series DC/DC converters are protected

from thermal overload by an internal over temperature

shutdown circuit. When the Pcb temperature adjacent to

the primary mosfet exceeds +120oC (+5oC, -5oC), the

power module will automatically shut down. It will restart

when the temperature drops to +100oC (+5oC, -5oC).

Over Temperature Protection (OTP)

Output Ripple & Noise (VOac)

Output ripple is measured as the peak to peak voltage

from 0 to 20MHz which includes the noise voltage and

the fundamental ripple.

Paralleling for Redundancy

The figure below illustrates how n + 1 redundancy can be

achieved. The customer provided diodes on the converter

outputs allow a failed converter to remove itself from the

shared group without pulling down the common output

bus. This configuration can be extended to additional

numbers of converters. Based on the desired circuit, the

converters can be controlled individually or in groups by

means of signals to the primary Remote On/Off inputs.

Circuit Configuration for Output Voltage

Adjustment (Trim)

+VOUT

+SENSE

TRIM

-SENSE

-VOUT

Load

RTRIM-DOWN

TRIM DOWN

Load

+VOUT

+SENSE

TRIM

-SENSE

-VOUT

RTRIM-UP

TRIM UP

When powering loads with significant dynamic current

requirements, the voltage regulation at the load can be

improved by the addition of decoupling capacitance at

the load. The most effective technique is to locate low

ESR ceramic capacitors as close to the load as possible,

using several capacitors to lower the effective ESR. These

ceramic capacitors will handle short duration high

frequency components of dynamic load changes. In

addition, higher values of electrolytic capacitors should be

used to handle the mid-frequency components. It is

equally important to use good design practices when

configuring the DC distribution system.

Low resistance and low inductance Pcb (printed circuit

board) layouts and cabling should be used. Remember

that when using remote sensing, all the resistance,

inductance, and capacitance of the distribution system is

within the feedback loop of the converter. This can have

an affect on the converter's compensation and the

resulting stability and dynamic response performance.

As a "rule of thumb", 100uF/A of output current can

be used without any additional analysis. For example,

with a 20A converter, values of decoupling capacitance

up to 2000uF can be used without regard to stability.

With larger values of capacitance, the load transient

recovery time can exceed the specified value. As much

of the capacitance as possible should be outside of the

remote sensing loop and close to the load. The absolute

maximum value of output capacitance is 10,000uF.

For values larger than this, please contact your local

Ericsson Power Modules representative.

Output Capacitance

The impedence of both the power source and the load will

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

most important to have the ratio between L and C as low as

possible, i.e. a low characteristic impedence, both at the

input and output, as the conveters have a low energy

storage capability. The PKB 4000 series DC/DC

PKB 4610 PINB

Preliminary Advanced Data Sheet

Ericsson Inc.

Power Modules

1700 International Pkwy.

Richardson, Texas 75081

Phone: 877-374-2642

www.ericsson.com/powermodules

Information given is believed to be accurate and reliable. No responsibility

is assumed for the consequences of its use for any infringement of patents

or other rights of third parties that may result from its use. No license is

granted by implication or otherwise under any patent or patent rights of

Ericsson Inc.,Power Modules. These products are sold only according to

Ericsson Inc., Power Modules' general conditions of sale, unless otherwise

confirmed in writing. Specifications are subject to change without notice.

Note: As an example a positive logic, no baseplate, short pin

product would be PKB 4610 PIPNBLA

Please check with the factory for availability.

Limitation of Liability

Ericsson Inc., Power Modules does not make any other

warranties, expressed or implied including any

warranty of merchantability or fitness for a particular

purpose (including, but not limited to, use in life

support applications, where malfunctions of product

can cause injury to a person's health or life).

Warranty

Ericsson Inc., Power Modules warrants to the original

purchaser or end user that the products conform to this

Data Sheet and are free from material and

workmanship defects for a period of five (5) years from

the date of manufacture, provided the product is used

within specified conditions and not modified in any

way.

In case the product is discontinued, claims will be

accepted up to three (3) years from the date of the

discontinuation.

For additional details on this limited warranty we refer

to Ericsson Inc., Power Modules "General Terms and

Conditions of Sales", or individual contract documents.

Quality Statement

The PKB 4000 series DC/DC converters are designed

and manufactured in an industrial environment where

quality systems and methods like ISO 9000, 6σ

(sigma), and SPC are intensively in use to boost the

continuous improvememts strategy. Infant mortality

or early failures in the products are screened out and

they are subjected to an ATE-based final test.

Conservative design rules, design reviews and product

qualifications, plus the high competence of an engaged

work force, contribute to the high quality of our

products.

Quality

Reliability

The Mean Time Between Failure (MTBF) of the PKB

4000 series DC/DC converter family is calculated to be

greater than (>) 3.72 million hours at full output

power and a pcb temperature of +90oC using the

Ericsson reliability database (TILDA/Preditool) which

is based on field failure rates and is continuously

updated. The data corresponds to actual failure rates of

components used in Information Technology and

Telecom equipment in temperature controlled

environments (TA= -5...+65oC). The data is considered

to have a confidence level of 90%. For more

information please refer to Design Note 002.

Product Options

Option Suffix Ordering No.

Non-baseplated NB PKB 4610 PINB

Positive Remote on/off logic P PKB 4610 PIP

Lead length 0 .145" +/-0.010" LA PKB 4610 PINBLA