PKJ 4000 PI
37.5-150W DC/DC Power Modules
48V Input Series
•
•
•
•
•
•
•
High efficiency 91.5% Typ (5V)
at full load
Industry standard footprint
Max case temperature +100ºC
Wide input voltage range according
to ETSI specifications
High power density, up to 55W/in
3
1,500 Vdc isolation voltage
MTBF > 3 million hours in
accordance with Bellcore TR-332
The PKJ series represents a “third generation” of High
Density DC/DC Power Modules providing 90% efficiency.
To achieve this high efficiency, Ericsson uses proprietary drive
and control circuits with planar magnetics and low resistivity
multilayer PCB technology, and a patent pending topology
with active rectification. The PKJ series can be used without
bulky and height consuming heatsinks, resulting in a lower
total cost. This also provides narrow board spacing for elec-
tronic, shelf based applications.
The products are in the industry standard package size and
offer a beneficial alternative to competing products on the
market. Because for certain applications they may not
require heatsinks, they are ideal for cost sensitive or high-
density applications.
The PKJ series also offers the flexibility of using a heatsink
when needed, enabling reduced airflow, extended reliability
or higher ambient temperature operation in a wide range of
48V and 60V DC powered systems. Similar to other
Ericsson Power Modules, the PKJ series includes an under-
voltage shut down facility, protecting the associated batter-
ies from being too deeply discharged. The PKJ series also
offers over-voltage protection, over-temperature protection
and is short circuit proof.
These products are manufactured using highly automated
manufacturing lines with a world-class quality commitment
and a five-year warranty. Ericsson Components AB has been
an ISO 9001 certified supplier since 1991.
For product
program please see back cover.
General
Absolute Maximum Ratings
Characteristics
T
C
T
S
V
I
Maximum Operating Case Temperature
Storage temperature
Continuous input voltage
min
-40
-40
-0.5
1,500
15
1
max
+100
+125
+75
Unit
°C
°C
Vdc
Vdc
Vdc
A
2
s
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.
For design margin and to enhance system reliability,
it is recommended that the PKJ series DC/DC power
modules are operated at case temperatures below 90°C.
V
ISO
Isolation voltage
(input to output test voltage)
V
RC
Remote control voltage
I
2
t
Inrush transient
Input
T
C
< T
Cmax
Characteristics
V
I
V
Ioff
V
Ion
C
I
I
Iac
Input voltage
range
1)
Turn-off input
voltage
Turn-on input
voltage
Input capacitance
Reflected
ripple current
Maximum input
current
5 Hz to 20 MHz-150W
50
75
100
150
W
W
W
W
2.5
.05
Ramping from
higher voltage
Ramping from
lower voltage
Conditions
min
36
31
33
34
2.8
20
1.6
2.4
3.2
5.3
7.5
2.5
36
typ max
72
Unit
Vdc
Vdc
Vdc
µF
mA p-p
1) See also Input Voltage in the Operating
Information section
Safety
The PKJ Series DC/DC power modules are
designed to comply with EN 60 950 Safety of
information technology equipment including
electrical business equipment.
The PKJ DC/DC power modules are also
recognized by UL and meet the applicable
requirements in UL 1950, Safety of information
technology equipment and applicable Canadian
safety requirements.
The isolation is an operational insulation in
accordance with EN 60 950. The DC/DC power
module should be installed in end-use equipment,
in compliance with the requirements of the
ultimate application, and is intended to be
supplied by an isolated secondary circuit.
Consideration should be given to measuring
the case temperature to comply with T
Cmax
when in operation.
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 60V
DC power system, reinforced insulation must be
provided in the power supply that isolates the
input from the 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.
I
Imax
V
I
= V
I
min
A
P
Ii
P
RC
Input idling power
Input
stand-by power
V
I
= 50V
(turned off with RC)
Maximum input
voltage on trim pin
I
O
= 0
RC open
W
W
TRIM
6
Vdc
Environmental Characteristics
Characteristics
Random
Vibration
Test procedure & conditions
IEC 68-2-34E
d
Frequency
Spectral density
Duration
10...500 Hz
0.025 g2/Hz
10 min in each
direction
10-500 Hz
0.75mm
10g
10 in each axis
50 g
3ms
-40°C...+100°C
300
85°C
85% RH
500 hours
260° C
10...13 s
Sinusoidal
Vibration
IEC 68-2-6 F
c
Frequency
Amplitude
Acceleration
# of cycles
Peak acceleration
Duration
Temperature
Number of cycles
Temperature
Humidity
Duration
Temperature, solder
Duration
Shock
(half sinus)
Temperature
change
Accelerated
damp heat
IEC 68-2-27 E
a
IEC 68-2-14 N
a
IEC 68-2-3 C
a
with bias
Solder
resistibility
IEC 68-2-20 T
b
method IA
2
Data Sheet AE/LZT 137 57 R1 © Ericsson Components AB, August 1999
Safety (continued)
The galvanic isolation is verified in an electric strength test. The
test voltage (V
ISO
) between input and output is 1,500 Vdc for
60 sec. Leakage current is less than 1
µA
@ 50Vdc.
Flammability ratings of the terminal support and internal plastic
construction details meet UL 94V-0.
A fuse should be used at the input of each PKJ series power module.
If a fault occurs in the power module, that imposes a short on the
input source, this fuse will provide the following two functions:
• Isolate the failed module from the input source so that the
remainder of the system may continue operation.
• Protect the distribution wiring from
overheating.
A fast blow fuse should be used with a rating of 10A or less. It is
recommended to use a fuse with the lowest current rating, that is
suitable for the application.
Mechanical Data
Connections
Weight
Designation
-In
Case
RC
+In
-Out
-Sen
Trim
+Sen
+Out
Function
Negative input
Connected to base plate
Remote control (primary). To turn-on
and turn-off the output
Positive input
Negative output
Negative remote sense (if sense not needed, connect to -Out)
Output voltage adjust
Positive remote sense (if sense not needed, connect to +Out)
Positive output
85 grams
Case
Aluminum baseplate with metal standoffs.
Pins
Pin material: Brass
Pin plating: Tin/Lead over Nickel.
Data Sheet AE/LZT 137 57 R1 © Ericsson Components AB, August 1999
3
Thermal Data
The PKJ series DC/DC power modules has a robust thermal design
which allows operation at case (baseplate) temperatures (T
C
) up to
+100°C. The main cooling mechanism is convection (free or forced)
through the case or optional heatsinks.
The graph above shows the allowable maximum output
current to maintain a maximum +100°C case temperature.
Note that the ambient temperature is the air temperature
adjacent to the power module which is typically elevated
above the room environmental temperature.
The graphs below can be used to estimate case temperatures
for given system operating conditions (see Thermal design).
For further information on optional heatsinks, please contact
your local Ericsson sales office.
Thermal Design
The thermal data can be used to determine thermal performance
without a heatsink.
Case temperature is calculated by the following formula:
T
C
= T
A
+ P
d
x R
thC-A
where P
d
= P
O
(1/
η
- 1)
Where:
T
C
: Case Temperature
T
A
: Local Ambient Temperature
P
d
: Dissipated Power
R
thC-A
: Thermal Resistance from T
C
to T
A
The efficiency
η
can be found in the tables on the following pages.
For design margin and to enhance system reliability, it is recommend-
ed that the PKJ series DC/DC power modules are operated at case
temperatures below 90°C.
4
Data Sheet AE/LZT 137 57 R1 © Ericsson Components AB, August 1999
PKJ 4719 PI (75W)
T
C
= -40...+100°C, V
I
= 36...72 V dc unless otherwise specified.
Output
Characteristics
Conditions
min
V
Oi
Output voltage initial
setting and accuracy
Output adjust range
V
O
Output voltage
tolerance band
Line regulation
Load regulation
V
tr
Load transient
voltage deviation
Load transient
recovery time
Start-up time
Output current
Max output power
Current limit threshold
Short circuit current
Output ripple and noise
Supply voltage
rejection
Overvoltage protection
I
O
= I
Omax
f<1 kHz
f < 20 MHz
-53
At V
O
= V
Onom
V
O
= 0.90 x V
Onom
@ T
C
<100°C
31
35
35
75
From V
I
connection to V
O
= 0.9 x V
Onom
0
T
C
= +25°C, V
I
= 53V, I
O
= I
Omax
2.45
Output
typ
2.5
max
2.55
Unit
V
I
O
= 0 to I
Omax
I
O
= 0 to I
Omax
2.0
2.38
2.75
2.63
V
V
V
I
= 36...72V, I
O
= I
Omax
V
I
= 53V, I
O
= 0 to I
Omax
Load step = 0.25 x I
Omax
dI/dt = 1A/µs
2
2
±
160
15
15
mV
mV
mVpeak
t
tr
50
µs
t
s
I
O
P
Omax
I
lim
I
SC
V
O
ac
SVR
35
55
30
75
41
41
150
ms
A
W
A
A
mVp-p
dB
OVP
3.0
3.3
3.9
V
Miscellaneous
Characteristics
η
P
d
f
O
Efficiency
Power dissipation
Switching frequency
Conditions
T
A
= +25°C, V
I
= 53V, I
O
= I
Omax
I
O
= I
Omax
, V
I
= 53V
I
O
= 0.1...1.0 x I
Omax
min
84
typ
87
11.2
150
max
Unit
%
W
kHz
Data Sheet AE/LZT 137 57 R1 © Ericsson Components AB, August 1999
5
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