50 W DC/DC power module
48 V input series
Regulated single and dual outputs
Efficiency >90% (3.3V) from 30%
to full load
Low profile 8.5 mm
(0.335 in.)
1,500 Vdc isolation voltage
MTBF >200 years at +75C case
temperature
Full power up to +80C ambient at
1 m/s airflow
Complete, no extra filters or
heatsinks required
The PKN 4000 I series of DC/DC power modules are
intended to be used as distributed power sources in
decentralized 48/60 V DC power systems. The PKN
series use a ceramic substrate with thickfilm technolo-
gy and a high degree of silicon integration. That to-
gether with the electrical design using synchronous
rectification gives good thermal management, high
reliability and high efficiency. The high efficiency,
makes it possible to operate over a wide temperature
range without a heatsink. At forced convection cooling
>200 lfm (1 m/s), the PKN units can deliver full
E
PKN 4000 I
power up to +80C ambient temperature. The high
reliability and the low profile of the PKN series makes
them particularly suited for Information Technology
and Telecom (IT&T) applications with board spacing
down to 15 mm (0.6 in.).
These products are manufactured using highly
automated manufacturing lines with a world-class
quality commitment and a five-year warranty.
Ericsson Microelectronics AB has been an ISO 9001
certified supplier since 1991. For a complete product
program please reference the back cover.
2
EN/LZT 146 27 R4A Ericsson Microelectronics, February 2002
General
Safety
The PKN 4000 I Series DC/DC power
modules are designed in accordance with
EN 60 950 Safety of information technology
equipment including electrical business equipment,
and certified by SEMKO.
The isolation is an operational insulation in
accordance with EN 60 950.
The PKN DC/DC power modules are re-
cognized by UL and meet the applicable
requirements in UL 1950 Safety of informa-
tion technology equipment, the applicable
Canadian safety requirements and UL 1012
Standard for power supplies.
The DC/DC power module shall be
installed in an end-use equipment and is
intended to be supplied by isolated
secondary circuitry and shall be installed in
compliance with the requirements of the
ultimate application. When the supply to
the DC/DC power module meets all the
requirements for SELV (<60Vdc), the
output is considered to remain within
SELV limits (level 3). If connected to a 60
V DC power system reinforced insulation
must be provided in the power supply that
isolates the input from the ac mains. Single
fault testing in the power supply must be
performed in combination with the DC/DC
power module to demonstrate that the
output meets the requirement for SELV.
One pole of the input and one pole of the
output is to be grounded or both are to be
kept floating.
The terminal pins are only intended for
connection to mating connectors of
internal wiring inside the end-use
equipment.
These DC/DC power modules may be used
in telephone equipment in accordance with
paragraph 34 A.1 of UL 1459 (Standard
for Telephone Equipment, second edition).
The isolation voltage is a galvanic isolation
and is verified in an electric strength test.
Test voltage between input and output is
1500 V dc for 60 s. In production the test
duration may be decreased to 1 s.
The capacitor between input and output
has a value of 4.7 nF and the leakage
current is less than 1
m
A @ 50 Vdc.
Flammability ratings of the terminal
support and internal plastic construction
details meets UL 94V-0.
Absolute Maximum Ratings
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 Output data or Electrical Characteristics. If exposed to stress above these limits, function and performance
may degrade in an unspecified manner.
Characteristics
min
max
Unit
T
C
Case temperature @ max output power
45
+100
C
T
S
Storage temperature
55
+125
C
V
I
Input voltage
0.5
+80
V dc
V
LO
Local on/off voltage pin 1
0.5
+ 80
V dc
V
RC
Remote control voltage
0
6
V
Note:
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.
1)
V
ISO
1500
V dc
Isolation voltage
(input to output test voltage)
V
RO
Remote on/off voltage pin 2
0.5
+ 80
V dc
Input T
C
< T
C max
Characteristics
Conditions
min
typ
max
Unit
V
I
Input voltage range
1)
36
75
V
V
I off
Turn-off input voltage
(See Operating Information)
32
V
V
I on
Turn-on input voltage
(See Operating Information)
34
V
C
I
Input capacitance
4
mF
I
O
=0,V
I
= 53 V
1.3
W
Equivalent inrush current resistance
m
W
r
I rush
Input idling power
P
Ii
Input stand-by power
V
I
= 53 V, LO/RO to pin 6
P
Ist-by
W
150
0.25
V
adj
Output adjust voltage pin 17
0.5
2V
Oi
V dc
Characteristics
Frequency
10...500 Hz
Amplitude
0.75 mm
Acceleration
10 g
Number of cycles
10 in each axis
Vibration
(Sinusoidal)
IEC 68-2-6 F
c
Test procedure & conditions
Environmental Characteristics
Peak acceleration
200 g
Shock duration
3 ms
Shock
(Half sinus)
IEC 68-2-27 E
a
Temperature
40C... +125C
Number of cycles
300
Temperature
change
IEC 68-2-14 N
a
Temperature, solder
260C
Duration
10...13 s
Accelerated
damp heat
Solder
resistability
IEC 68-2-3 C
a
with bias
IEC 68-2-20 T
b
1A
Temperature
85C
Humidity
85% RH
Duration
1000 hours
Water
+55 5C
Isopropyl alcohol
+35 5C
Terpens
+35 5C
Method
with rubbing
Resistance to
cleaning solvents
IEC 68-2-45 XA
Method 1
3
EN/LZT 146 27 R4A Ericsson Microelectronics, February 2002
Mechanical Data
Dimensions in mm (in)
Case
Plastic coated aluminum casing with tin plated brass pins.
Weight
Maximum 40 g (1.40 oz) for PKN single and maximum 45 g
(1.58 oz) for PKN dual.
Connections
Pin
Designation
Function
1
LO
Local on/off. Turns the module off immediately after
LO pin is connected to positive input pin.
2
RO
Remote on/off. Turns the module off approx. 1.5 sec.
after RO pin is connected to positive input pin.
3
R
Alarm reset. Resets the alarm and turns on the
module when connected to the negative input pin.
4
P
Alarm. Alarm pin P goes high when active.
5
Q
Alarm battery pin. (Connected to positive input pin.)
6
In
Negative input pin.
7
+In
Positive input pin. (Input ground.)
8
No pin
9
Out
Negative output pin.
10
Out
Negative output pin.
11
Out
Negative output pin.
12
No pin
13
No pin
14
+ Out
Positive output pin.
15
+ Out
Positive output pin.
16
+ Out
Positive output pin.
17
V
adj
Output voltage adjust.
Pin
Designation Function
1
LO
Local on/off. Turns the module off immediately after
LO pin is connected to positive input pin
2
RC
Remote Control. Turns the module off immediately
after RC pin is connected to negative input pin
3
NC
Not Connected
4
NC
Not Connected
5
NC
Not Connected
6
In
Negative input
7
+ In
Positive input
8
No pin
9
V
adj
Out 2
Output 2 voltage adjust
10
+ Out 2
Output 2
11
+ Out 2
Output 2
12
Rtn
Return
13
Rtn
Return
14
Rtn
Return
15
+ Out 1
Output 1
16
+ Out 1
Output 1
17
V
adj
Out 1
Output 1 voltage adjust
Single output
Dual output
Connections
4
EN/LZT 146 27 R4A Ericsson Microelectronics, February 2002
Fundamental circuit diagram
Electrical Data
Single output
Control
Control
Isolated
feedback
14
15
16
9
10
11
17
7
1
2
3
4
5
6
Dual output
7
1
2
6
9
10
11
12
13
14
15
16
17
Control
IC
Control
IC
Control IC
Isolated
feedback
5
EN/LZT 146 27 R4A Ericsson Microelectronics, February 2002
0
20
A
PKN 4318 PIOA
Characteristics
Conditions
Output 1
min
typ
max
Unit
Output voltage initial
setting and accuracy
T
C
= +25 C, I
O
= 20 A, V
I
= 53 V
V
Oi
Output voltage
tolerance band
V
O
Idling voltage
I
O
= 0 A
Load regulation
I
O
= 0.01 ...1.0
I
O max
, V
I
= 53 V
t
tr
Load transient voltage
V
tr
Ramp-up time
t
r
Start-up time
t
s
0.1 ...0.9
V
O
From V
I
connection
to V
O
= 0.9
V
Oi
Output current
I
O
Max output power
2)
P
O max
Current limiting
threshold
I
lim
T
C
< T
C max
Short circuit current
3)
I
sc
T
C
= + 25 C
Output ripple & noise
20 Hz ...5 MHz
Supply voltage
rejection (ac)
SVR
f = 100 Hz sine wave, 1 V
p-p
, V
I
= 53 V
(SVR = 20 log (1 V
p-p
/V
O p-p
))
Line regulation
I
O
= I
O max
Load transient
recovery time
1.49
1.50
1.51
V
1.47
1.55
V
mV
15
30
mV
+220
mV
-220
mV
T
C
= 25...+90C, V
I
= 36 ...75V unless otherwise specified.
10
25
ms
25
60
ms
30
W
22.5
24
A
26
A
50
100
mV
p-p
V
O ac
60
dB
100
m
s
I
O
=I
O max
Long term drift
included
Output
I
O
= 0.1 ...1.0
I
O max
1
20
Output adjust range
1)
1.35
1.65
V
I
O
=0.1 ... 1.0
I
O max
, V
I
= 53 V
load step = 0.5 I
Omax
I
O
=
0.1...1.0
I
O max
V
I
= 53 V
OVP
Over voltage protection
2.0
2.15
2.3
V
1.47
1.53
V
1)
See Operating information, Single output.
2)
See also Typical Characteristics, Power derating.
3)
The converter shuts down when the output voltage drops below the UVD level.
Characteristics
Conditions
Unit
min
typ
max
Efficiency
h
Power dissipation
P
d
Miscellaneous
86.5
87.3
%
4.7
W
I
O
= I
O max
, V
I
= 53 V, T
C
= + 25 C
I
O
= I
O max
, V
I
= 53 V, T
C
= + 25 C
Calculated value
UVD
Under voltage detection
0.4
1.0
V
V
I
= 53 V
V
I
= 53 V
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