DC/DC Converter
48V Input, 5.0V at 15A 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 approximately 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 91.5%
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
emerg- ing telecom market for applications in the
E
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, higher
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; 91.5% Typ. at 15A
92.6% at 8A
• 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 and IEC/EN
60 950 Recognized
PKB 4711 PINB
Features
Product shown is the PKB 4711 PINB
2EN/LZT 108 6069 R1C ©Ericsson Inc., Power Modules , November 2002
PKB 4711 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 in-stalled 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 supply 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.
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.
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
–
55 +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 2.50 A
Reflected ripple current 5 Hz to 20 MHz
Characteristics Conditions min typ max Unit
IO =0, VI = 53 V
1.9 W
Input idling power
PIi
Input stand-by power
(turned off with RC)
VI=53V, RC open .055 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
3
EN/LZT 108 6069 R1C ©Ericsson Inc., Power Modules , November 2002
PKB 4711 PINB
Mechanical Data
PKB 4711 PI Maximum 25 g (est.)
PKB 4711 PINB Maximum 20 g
Weight
Material: Brass Alloy
Plating: Tin over Nickel
Pins
Electrical Data
3
2
1
Primary Secondary
Control
Isolated
Feedback
8
4
6
7
5
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
L2
CD3
L1
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 6069 R1C ©Ericsson Inc., Power Modules , November 2002
PKB 4711 PINB
TPcb = –40…+100°C, VI = 36 ...75V unless otherwise specified.
Output
typ
max
Miscellaneous
Efficiency Output Current Derating
50 µs
30 50 60 ms
0 15 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
VO
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
4.90 5.0 5.10 V
3 10 mV
75 W
16 17.5 18.5 A
19 21 23 A
80 mVp-pVOac
70 dB
+/-250 mV
IO=IOmax, f < 20 MHz
IO=0 to IOmax
mV
3 10
Output adjust range 4.00 5.50 V
Load step = 0.25...0.75 x IOmax
di/dt = 8A/us
OVP Over voltage protection 5.6 7.2 V
4.85 5.15 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 152 160 168 kHz
η Efficiency - 50% Load IO = IOmax, VI = 53V, TPcb = +25oC 92.6 %
Pd Power dissipation IO = IOmax, VI = 53V, TPcb = +25oC 6.97 W
η Efficiency - 100% Load IO = IOmax, VI = 53V, TPcb = +25oC 91.0 91.5 %
TA = +25oCVI = 53V
85
86
87
88
89
90
91
92
93
94
0 2 4 6 8 10 12 14
C u r r e n t ( A )
Efficiency (%)
0.0
2.5
5.0
7.5
10.0
12.5
15.0
20 30 40 50 60 70 80 90 100 110
A m b i e n t T e m p e r a t u r e ( C )
Output Current (A)
3.0 mps
2.5 mps
2.0 mps
1.5 mps
1.0 mps
Nat Conv
36V
48V
53V
75V
5
EN/LZT 108 6069 R1C ©Ericsson Inc., Power Modules , November 2002
PKB 4711 PINB
Output Characteristic (typ) Power Dissipation
TA = +25oC
Start-up
TA = +25oC, IO = 15A, Vin = 53V
(Load >2A or a capcitor > 220uF)
TA = +25oC, IO = 15A, Vin = 53V
Turn-Off
TA = +25oC, IO = 15A, Vin = 53V
Output Ripple
0
10
20
30
40
50
60
-0.02 00.02 0.04 0.06 0.08 0.1
0
1
2
3
4
5
6
0 5 10 15 20
C u r r e n t ( A )
Voltage
Uin 36V
Uin 48V
Uin 53V
Uin 75V
0
1
2
3
4
5
6
7
8
9
10
1 3 5 7 9 11 13 15
C u r r e n t ( Io )
Power Loss (W)
Uin 36V
Uin48V
Uin 53V
Uin 75V
-0.08
-0.06
-0.04
-0.02
0
0.02
0.04
0.06
0.08
-0.0008 -0.0006 -0.0004 -0.0002 00.0002 0.0004
Transient
TA = +25oC, IO = 3.75-7.5-3.75A, Vin = 53V
0
1
2
3
4
5
6
-2 -1 0 1 2 3 4
6EN/LZT 108 6069 R1C ©Ericsson Inc., Power Modules , November 2002
PKB 4711 PINB
Output Voltage Trim for 5.0V
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 TPcb
must be limited to absolute max +110oC. The absolute
maximum continuous input voltage is 80V DC.
The conveter will compensate for up to 0.5V voltage drop
between the sense voltage and the voltage at the converter
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 4711 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 converter 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 have latching
output overvoltage protection. In the event of an
overvoltage condition, the conveter 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
converter 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
1
10
100
1000
10000
100000
1000000
0246810 12 14 16 18 20
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
7
EN/LZT 108 6069 R1C ©Ericsson Inc., Power Modules , November 2002
PKB 4711 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
converter 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)
D
+VOUT
+SENSE
TRIM
-SENSE
-VOUT
Load
RTRIM-DOWN
TRIM DOWN
Load
D
+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 converters have a low energy
storage capability. The PKB 4000 series DC/DC
8EN/LZT 108 6069 R1C ©Ericsson Inc., Power Modules , November 2002
PKB 4711 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.
Product Options
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
workforce, 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.
Note: As an example a positive logic, no baseplate, short pin
product would be PKB 4711 PIPNBLA
Please check with the factory for availability.
Option Suffix Ordering No.
Non-baseplated NB PKB 4711 PINB
Positive Remote on/off logic P PKB 4711 PIP
Lead length 0 .145" +/-0.010" LA PKB 4711 PINBLA
