PKB 4418 PINB
DC/DC Converter
48V Input, 1.8V at 25A Output
• High Efficiency; 88.5% Typ. at 25A
91% at 12.5A
• 1/8th brick pkg: low profile 58 x 19 mm
2
(2.28 x 0.75 in
2
)
• Pin compatible replacement for Industry-
standard quarter brick
• 2,250 V dc isolation and meets Isolation
Requirements equivalent to Basic Insula-
tion according to IEC/EN/UL 60 950
• Fast Dynamic Response, t
tr
= 50 us
• More than 3.7million hours predicted
MTBF
• UL/UL
C
60 950 Recognized and Certified
in accordance with EN 60 950
Product shown is the PKB 4418 PINB
Features
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 applications. 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 synchronous rectification technology
and achieves an efficiency up to 88.5% 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
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.
E
PKB 4418 PINB
General
Characteristics
T
Pcb
T
S
V
I
V
ISO
V
Trans
V
RC
V
adj
Absolute Maximum Ratings
min
– 40
– 55
– 0.5
2250
80
(measured from pin 1)
-0.5
-0.5
15
2 x V
o
max
+110
+125
+ 80
Unit
°C
°C
V dc
V dc
V dc
Vdc
Vdc
Safety
Maximum Operating Pcb Temperature
Storage temperature
Input voltage
Isolation voltage (input to output test voltage)
Input Voltage Transient
Remote control voltage pin 2
Output adjust voltage pin 6 (measured from pin 5)
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.
Input T
Pcb
< T
Pcb
Characteristics
V
I
V
I off
max
Conditions
I
O
= 0...I
Omax
Ramping from higher
voltage
Ramping from lower
voltage, I
O
= 0...I
Omax
min
38
30
33.5
typ
max
75
35
Unit
Vdc
Vdc
Input voltage range
1)
Turn-off input voltage
V
Ion
Turn-on input voltage
32
34.5
36
Vdc
C
I
I
Iac
I
I max
P
Ii
P
RC
V
TRIM
Input capacitance
Reflected ripple current
Maximum input current
Input idling power
Input stand-by power
(turned off with RC)
Maximum input voltage
on trim pin
5 Hz to 20 MHz
V
I
= V
Imin,
I
O
=0, V
I
= 53 V
V
I
= 53V, RC open
66 W
2.18
10
1.55
1.6
0.055
6.6
uF
mA
p-p
A
W
W
Vdc
Note:
1) The input voltage range 38...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.
Environmental Characteristics
Characteristics
Random
Vibration
Sinusoidal
Vibration
Test procedure & conditions
IEC 68-2-34E
D
Frequency
Spectral density
Duration
Frequency
Amplitude
Acceleration
Number of cycles
Peak acceleration
Duration
Temperature
Number of cycles
Temperature
Humidity
Duration
Temperature, solder
Duration
Water
Isopropyl alcohol
Method
10...500 Hz
0.025 g
2
/Hz
10 min each direction
10...500 Hz
0.75mm
10g
10 in each axis
100g
3ms
-40°C… +125°C
300
85°C
85% RH
1000 hours
260°C
10…13 s
+55 ±5°C
+35 ±5°C
with rubbing
The PKB 4000 PI Series DC/DC converters
are designed in accordance with Safety
Standards IEC/EN/UL 60 950,
Safety of
Information Technology Equipment.
The PKB 4000 Series DC/DC converters are
UL
C
60 950 recognized and certified in
accordance with EN 60 950.
The DC/DC converters should be installed in
end-use equipment, in accordance with the
requirements of the ultimate application.
The input source must be isolated by
minimum Basic Insulation from the primary
circuit in accordance with IEC/EN/UL 60
950. If the input voltage to the DC/DC
converter is 75Vdc or less, then the output
remains SELV (Safety Extra Low Voltage)
under normal and abnormal operating
conditions. Single fault testing in the input
power source circuit should be performed
with the DC/DC converter connected to
demonstrate that the input voltage does not
exceed 75Vdc. If the input power source
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 DC/
DC converter. The PKB series DC/DC
converters are approved for a maximum fuse
rating of 15A. If a fault occurs in the DC/DC
converter that imposes a short circuit on the
input power source, this fuse will provide the
following functions:
•
IEC 68-2-6 F
c
Isolate the faulty DC/DC converter from the
input source so as not to affect the
operation of other parts of the system.
Shock
(Half sinus)
Temperature
change
Accelerated
damp heat
Solder
resistability
Resistance to
cleaning solvents
IEC 68-2-27 E
a
IEC 68-2-14 N
a
IEC 68-2-3 C
a
with bias
IEC 68-2-20 T
b
1A
IEC 68-2-45 XA
Method 1
• Protect the distribution wiring from
excessive current and power loss thus
preventing hazardous overheating.
The galvanic isolation is verified in an electric
strength test. The test voltage (V
ISO
) between
input and output is 2250 Vdc for 60 seconds.
Leakage current is less than 1uA at nominal
input voltage.
The flammability rating for all construction
parts of the DC/DC converter meets UL 94V-0.
EN/LZT 108 6072 P1A ©Ericsson Inc., Power Modules , November 2002
2
PKB 4418 PINB
Mechanical Data
Connections
Pin
1
2
3
4
5
6
7
8
Designation
- INPUT
RC
+ INPUT
- OUTPUT
- SENSE
TRIM
+ SENSE
+ OUTPUT
Function
Negative input
Remote on/off (primary) to
turn-on and turn-off the output
Positive input.
Negative output
Negative remote sense
Output voltage adjust
Positive remote sense
Positive output
Weight
PKB 4418 PI Maximum 25 g (est.)
PKB 4418 PINB Maximum 20 g
Pins
Material: Brass Alloy
Plating: Tin over Nickel
Electrical Data
Fundatmental Circuit Diagram
Primary
3
Secondary
Choke
Resistor
Capacitor
8
2
Control
4
Note:
• If the remote sense is not needed the
"-Sense" should be connected to "-Out"
and the "+Sense" should be connected
to "+Out."
• If the remote control is not needed
the RC pin must be connected to -V
in
for negative logic.
For positive logic the pin should be
left open or floating.
Control
1
Isolated
Feedback
5
7
6
Class B External Input EMI Filter Circuit Diagram
The following external input filter is required to meet EN55022 Class B
EMI requirements. Please refer to Design Note 19 for further information.
CY4
CY2
+
CD1
Cin
+
L2
Vin 36-75Vdc
CD3
CD2
CY3
L1
CYS2
PKB
Module
-
-
Output
CYS1
CY1
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
3
EN/LZT 108 6072 P1A ©Ericsson Inc., Power Modules , November 2002
PKB 4418 PINB
Output
T
Pcb
= –40…+100°C, V
I
= 38 ...75V unless otherwise specified.
Characteristics
Output voltage initial
setting and accuracy
Output adjust range
V
O
Output voltage
tolerance band
Line regulation
Load regulation
V
t r
t
t r
Load transient
voltage deviation
Load transient
recovery time
Start-up time
Output current
Max output power
Current limit threshold
Short circuit current
Output ripple & noise
Supply voltage
rejection (ac)
Over voltage protection
I
O
=I
O max, f < 20 MHz
f < 1kHz
70
At V
O
= V
Onom
V
O
= 0.96 V
Onom
From V
I
connection to V
O
= 0.9
×
V
Onom
45
0
45
28
32
30
33.5
32
35
80
typ
Output
min
typ
1.80
max
max
1.836
1.98
Conditions
T
Pcb
=+25 °C, V
I
= 53 V, I =I
Omax
O
I
O
=I
Omax
I
O
=0 to I
O max
Unit
1.764
1.44
V
V
V
Oi
1.746
3
3
+/-100
1.854
10
10
V
mV
mV
mV
I
O
=I
O m a x
V
I
= 53V, I
O
=0 to I
O max
,
Load step = 12.5A I
O
= 6.25... 18.75A
V
I
= 53V, di/dt = 8A/us
50
µs
t
s
I
O
P
Omax
I
lim
I
sc
V
Oac
SVR
55
75
25
ms
A
W
A
A
mV
p-p
dB
OVP
V
I
= 53V, I
O
= 0 ...25A
2.1
3.3
V
Miscellaneous
Characteristics
η
η
P
d
f
S
Efficiency - 50% Load
Efficiency - 100% Load
Power dissipation
Switching frequency
Conditions
I
O
= I
Omax
, V
I
= 53V, T
Pcb
= +25
o
C
I
O
= I
Omax
, V
I
= 53V, T
Pcb
= +25
o
C
I
O
= I
Omax
, V
I
= 53V, T
Pcb
= +25
o
C
I
O
= 0...1.0 x I
Omax
min
88.5
typ
91
88.5
5.77
max
Unit
%
%
6.93
168
W
kHz
152
160
Efficiency
T
A
= +25
o
C
92
91
90
89
36V
Output Current Derating
V
I
= 53V
25
20
48V
Output Current (A)
53V
75V
15
3.0 mps
2.5 mps
2.0 mps
10
1.5 mps
1.0 mps
5
0.5 mps
Nat Conv
0
Efficiency ( %)
88
87
86
85
84
83
82
0
5
10
15
20
25
0
10
20
30
40
50
60
70
80
90
100
110
120
Current (A)
Ambient Temperature (C)
EN/LZT 108 6072 P1A ©Ericsson Inc., Power Modules , November 2002
4
PKB 4418 PINB
Output Characteristic (typ)
Power Dissipation
T
A
= +25
o
C
10
9
8
Power Loss (W)
2
1.8
1.6
1.4
Voltage (Vo)
1.2
1
0.8
0.6
0.4
0.2
0
25
27
29
31
33
35
Current (A)
Uin 36V
Uin 48V
Uin 53V
Uin 75V
7
6
5
4
3
2
1
0
0
Vin36V
Vin48V
Vin53V
Vin75V
5
10
15
20
25
Current (A)
Start-up
Turn-Off
T
A
= +25
o
C, I
O
= 25A, V
in
= 53V
(Load >2A or a capcitor > 220uF)
Output Ripple
Transient
T
A
= +25
o
C, I
O
= 25A, V
in
= 53V
T
A
= +25
o
C, I
O
= 25A, V
in
= 53V
EN/LZT 108 6072 P1A ©Ericsson Inc., Power Modules , November 2002
T
A
= +25
o
C, I
O
= 6.25-18.75-6.25A, V
in
= 53V
5
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