DC/DC converter
1.8 V/5 A /9 W Output
48 V Input
The MacroDensTM PKF 4918 CSI true component
level on-board DC/DC power modules are intended
as distributed power sources in decentralized 48 and
60VDC power systems.
The over -moulded rugged design also makes them
suitable for other demand ing industrial applications.
They are optimized for an operational ambient
temperature range in compliance with present and
future application needs, including non temperature
SMD package with ultra low compo-
nent height 8.0 mm (0.315 in.)
80% efficiency at full load
1,500 Vdc isolation voltage
Synchronous rectification
MTTF >10 million hours at +50C case
temperature (+40C ambient)
Low EMI
PKF 4918 CSI
E
controlled environments. The mechanical design
offers a surface mount version, delivered in
ready-to-use tubes, trays or tape & reel package, and
compatibility with semi and fully aqueous cleaning
processes.
For mechanical and other information please refer to
the PKF series General information EN/LZT 146 57
R1A.
Patents Pending
2
EN/LZT 146 024 R1A Ericsson Power Modules AB, March 2003
Stress in excess of Absolute Maximum
Ratings may cause permanent damage.
Absolute Maximum Ratings, some times
referred to as no destruction limits, are
nor mal ly tested with one parameter at a
time ex ceed ing the limits of Output data
or Electrical Char ac ter is tics. If exposed
to stress above these limits, function and
per form ance may de grade in an un spec i fi ed
manner.
Connections
* Output pin 3 is preferred, for optimum performance use both pin 1 & 3.
Absolute Maximum Ratings
Characteristics
Isolation voltage
(input to output test voltage)
V
ISO
min
max
Unit
T
C
Case temperature at full output power
45
+100
C
T
S
Storage temperature
55
+125
C
V
I
Continuous input voltage
1)
0.5
+75
V dc
1,500
V dc
V
tr
Transient input energy
0.10
Ws
V
RC
Remote control voltage pin 11 ref. to pin 17
5
+15
V dc
V
adj
Output adjust voltage pin 8 ref. to pin 17
5
+40
V dc
NOTES:
1)
The input voltage range 36...75 V dc meets
the Eu ro pe an Telecom Stand ard prETS
300 132-2 Nom i nal input volt age range in 48 V
and 60 V dc power systems,
40.5...57.0 V and 50.0... 72.0 V respec-
tively. Absolute max con tin u ous input volt age
is 75 V dc.
2)
The power modules will operate down to
35V, when V
I
decreases, but will turn on at
V
I
36V, when V
I
increases (see also Op er at ing
information).
Input T
C
<T
Cmax
unless otherwise specified
mW
mW
Input stand-by power
P
RC
V
I
Input voltage range
1)2)
36
75
V
V
Ioff
Turn-off input voltage
30.0
35.0
V
33.5
See typical characteristics
V
Ion
Turn-on input voltage
36.0
V
34.5
See typical characteristics
C
I
Input capacitance
F
1.4
P
Ii
Input idling power
I
O
= 0, T
C
=30...+95C
(V
I
=53V)
(V
I
=66V)
550
700
(V
I
=53V)
(V
I
=66V)
40
60
T
C
=30...+95C,
RC connected to pin 17
Characteristics
Conditions
min
typ
max
Unit
32.0
Pin Designation Function
1 Out 1 Output 1*
2 Rtn Output return.
3 Out 1 Output 1, Preferred output *. Positive voltage ref. to Rtn.
4-6 NC Not connected. Isolated from each other.
7 Do not connect.
8 V
adj
Output voltage adjust.
9 NOR Connection of Nominal Output voltage Resistor
10 TOA Turn-on/off input voltage adjust.
11 RC Remote control. Used to turn-on and turn-off output.
1216 NC Not connected. Isolated from each other.
17 In Negative input.
18 +In Positive input.
18 17 16 15 14 13 12 11 10
1
2
3
4
5
6
7
8
9
3
EN/LZT 146 024 R1A Ericsson Power Modules AB, March 2003
Fundamental circuit diagram
Single output
Electrical Data
Safety
The PKF 4918 CSI DC/DC power module is designed in ac cord ance
with EN 60 950, Safety of information technology equipment
including elec tri cal busi ness equipment.
The PKF power modules are rec og nized by UL and meet the
ap pli ca ble re quire ments in UL 1950 Safety of in for ma tion tech nol o gy
equip ment, the ap pli ca ble Ca na di an safety re quire ments and UL 1012
Stand ard for power supplies.
The DC/DC power module shall be installed in an end-use equip ment
and considerations should be given to meas ur ing the case tem per a ture
to comply with T
Cmax
when in operation. Abnormal com po nent tests
are conducted with the input pro tect ed by an external
15 A fuse. The need for repeating these tests in the end-use
appliance shall be con sidered if in stalled in a circuit hav ing higher
rated de vic es.
When the supply to the DC/DC power mod ule meets all the
re quire ments for SELV (<60Vdc), the output is considered to re main
within SELV limits (level 3). The isolation is an op er a tion al insulation
in accordance with EN 60 950.
The DC/DC power module is intended to be supplied by isolated
secondary circuitry and shall be installed in compliance with the
re quire ments of the ultimate application. If they are connected to a
60 V DC system re in forced insulation must be pro vided in the power
supply that isolates the input from the mains. Single fault testing in
the power supply must be per formed in com bi na tion with the
DC/DC power module to dem on strate that the output meets the
re quire ment for SELV. One pole of the input and one pole of the
out put is to be grounded or both are to be kept fl oating.
The ter mi nal pins are only intended for con nec tion to mating
con nec tors of internal wiring inside the end-use equipment.
These DC/DC power modules may be used in telephone equip ment
in accordance with paragraph 34 A.1 of UL 1459 (Standard for
Tel e phone Equipment, second edition).
The galvanic isolation is verifi ed in an elec tric strength test. Test
voltage (V
ISO
) between input and out put is 1,500 Vdc for 60 s. In
pro duc tion the test duration may be decreased to 1 s.
The ca pac i tor be tween input and out put has a value of 2,2 nF and the
leak age cur rent is less than 1A @ 53 Vdc.
The case is designed in non-conductive epoxy. Its fl ammability
rating meets UL 94V-0. The oxygen index is 34%.
Transient input voltage
Single voltage pulse at +25C ambient temperature.
0
1
2
3
4
5
6
7
8
70
80
90
100
110
120
130
Transient voltage
Transient duration (s)
1x10
-6
1x10
-4
1x10
-2
1
1x10
2
4
EN/LZT 146 024 R1A Ericsson Power Modules AB, March 2003
T
C
= 30...+95 C, V
I
= 36 ...75 V, V
Inom
= 53 V unless otherwise stated
0 5.0 A
Characteristics
Conditions
Output 1
min
typ
max
Unit
Output voltage initial
setting and accuracy
V
Oi
Output voltage
tolerance band
V
O
Idling voltage
I
O
= 0 A
Load regulation
I
O
= 0...5 A, V
Inom
t
tr
Load transient voltage
V
tr
Temperature coefficient
2)
T
coeff
t
r
Start-up time
t
s
I
O
Max output power
2)
P
Omax
Current limiting
threshold
I
lim
T
C
<T
Cmax
, V
O
= 1.4 V
Short circuit cur rent
I
sc
V
O
= 0.2...0.5V, T
C
= +25C
20 Hz...5 MHz
Line regulation
I
O
= 5 A
Load transient
recovery time
1.77 1.80 1.84 V
1.69 1.81 1.91 V
10
+300 mV
300 mV
0.3 mV/C
2 ms
5 ms
9 W
5.5 A
7 A
50 mV
p-p
150
s
1.71 1.89 V
Long term drift
included
Output
V
I
= 36...55 V
Output adjust range
1)
1.50 1.80 2.20 V
I
O
= 0.5...5 A, V
Inom
load step = 2.5 A
50 dB
1)
See also Operating Information
2)
See Typical Characteristics
T
C
= +25C, I
O
= 3.5 A, V
Inom
Ramp-up time
Output current
2)
I
O
= 3 A
Output ripple & noise
V
Oac
f = 100 Hz sine wave, 1V
p-p
, V
Inom
(SVR = 20 log (1 V
p-p
/V
Op-p
))
I
O
= 0.5...5 A
,
V
Inom
From V
I
connection to V
O
= 0.9 V
Oi
I
O
=
0.3...5 A,
0.1...0.9 V
O
, V
Inom
I
O
= 5 A, T
C
= 40...+90 C
SVR
Supply voltage rejection (ac)
V
I
= 55...75 V
2.5
mV
Calculated value
25 mV
I
O
= 0.5...5 A
I
O
= 0.5...3 A Pin 1
1.60 1.89 V
75 mV
p-p
0.4...50 MHz
I
O
= 5 A
20 Hz...5 MHz
80 dB
V
2.3 3.0
Characteristics
Conditions
Unit
min
typ
max
P
d
Power dissipation
Miscellaneous
%
Efficiency
I
O
= 5 A
75 80
V
I
= 53 V
V
I
= 66 V
V
I
= 53 V
V
I
= 66 V
75 79
2.4 3.0
W
5
EN/LZT 146 024 R1A Ericsson Power Modules AB, March 2003
Typical Characteristics
Output characteristic (typ)
Power derating
Temperature coefficient
Turn-on/turn-off input voltage
Efficiency (typ)
@ T
A
= +25C
Current derating
0
1
2
3
4
5
50
60
70
80
90
100
Load Current (A)
Efficiency
%
36 V
53 V
75 V
0
1
2
3
4
5
6
7
1.6
1.7
1.8
1.9
2.0
Load Current (A)
Output
Voltage
(V)
-40
-20
0
20
40
60
80
100
1.70
1.75
1.80
1.85
1.90
Case temperature (C)
Output
voltage
(V)
Load
current
(
A)
Output voltage (V) initial setting
1.5
1.6
1.7
1.8
1.9
2.0
2.1
2.2
4.1
4.3
4.5
4.7
4.9
5.1
Dynamic load response (typ) @ +25C
0.1 ms/div
The output voltage
deviation is deter-
mined by the load
transient (dI/dt)
Load change:
dI/dt 4 A/s
2 A/div
200 mV/div
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