DC/DC power modules
3.3V/3A /9.9 W
SMD and through-hole versions
with ultra low component height
8.0 mm (0.315 in.)
78% efficiency
1,500 Vdc isolation voltage
Switching frequency syncronization
MTTF >10 million hours at +50C case
temperature
Low EMI
PKF 4910A I
E
The MacroDensTM 9.9W PKF 4910A I true
component level on-board DC/DC power modules are
intended as distributed power sources in decentralized
48 and 60V DC power systems. They are optimized
for an operational ambient temperature range in
compliance with present and future application needs,
including non temperature controlled environments.
The mechanical design offers the choice of surface
mount or through-hole versions, 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 data sheet.
2
EN/LZT 146 86 R1A Ericsson Microelectronics AB, December 2001
Notes:
1)
The input voltage range 38...72 Vdc meets
the European Telecom Standard prETS
300 132-2 Nominal input voltage range in
48V and 60 Vdc power systems,
40.5...57.0V and 50.0...72.0V respec-
tively. Absolute max continuous input
voltage is 75 Vdc.
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
Operating information).
Input T
C
<T
Cmax
unless otherwise specified
mW
mW
Input stand-by power
P
RC
V
I
Input voltage range
1)2)
38
72
V
V
Ioff
Turn-off input voltage
30.0
36.0
V
34.5
See typical characteristics
V
Ion
Turn-on input voltage
38.0
V
36.0
See typical characteristics
C
I
Input capacitance
mF
1.4
P
Ii
Input idling power
I
O
= 0, T
C
= 30...+ 95 C
(V
I
= 53V)
(V
I
= 66V)
310
310
(V
I
= 53V)
(V
I
= 66V)
25
40
T
C
= 30...+ 95 C,
RC connected to pin 17
Characteristics
Conditions
min
typ
max
Unit
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.
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
E
tr
Transient input energy
0.01
Ws
V
RC
Remote control voltage pin 11 ref. to pin 17
5
+16
V dc
V
adj
Output adjust voltage pin 8 ref. to pin 17
5
+40
V dc
Connections
18 17 16 15 14 13 12 11 10
1
2
3
4
5
6
7
8
9
Pin
Designation
Function
1
Out 1
Output 1(+).
2
Rtn
Output return.
3-6
N C
Not connected. Galvanically Isolated from input pins.
7
Sync
Synchronization input
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 and turn-on/off input voltage adjust.
1216
N C
Not connected. Galvanically isolated from input pins.
17
IMn
Negative input.
18
+In
Positive input.
3
EN/LZT 146 86 R1A Ericsson Microelectronics AB, December 2001
Safety
The PKF 4910A I DC/DC power module is designed in accordance
with EN 60 950, Safety of information technology equipment including
electrical business equipment. The PKF power modules are recognized
by UL and meet the applicable requirements in UL 1950 Safety of
information 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 equip-
ment and considerations should be given to measuring the case
temperature to comply with T
C max
when in operation. Abnormal
component tests are conducted with the input protected by an
external 15 A fuse. The need for repeating these tests in the end-
use appliance shall be considered if installed in a circuit having
higher rated devices.
When the supply to the DC/DC power module meets all the re-
quirements for SELV (<60Vdc), the output is considered to remain
within SELV limits (level 3). The isolation is an operational insula-
tion 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
requirements of the ultimate application. If they are connected to
a 60 V DC 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 float-
ing. 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 galvanic isolation is verified in an electric strength test. Test
voltage (V
ISO
) between input and output is 1,500 Vdc for 60 s. In
production the test duration may be decreased to 1 s.
The capacitor between input and output has a value of 1 nF and
the leakage current is less than 1A @ 53 Vdc.
The case is designed in non-conductive epoxy. Its flammability
rating meets UL 94V-0. The oxygen index is 34%.
Transient input voltage
Single voltage pulse at +25C ambient temperature.
Electrical Data
Fundamental circuit diagram, Single output
4
EN/LZT 146 86 R1A Ericsson Microelectronics AB, December 2001
T
C
= 30...+95C, V
I
= 38 ...72V and pin 8 connected to pin 9.
Output
3.3
Characteristics
Conditions
Unit
min
typ
max
P
d
Power dissipation
Miscellaneous
%
Efficiency
h
I
O
= 3 A
75
78
V
I
= 53 V
V
I
= 66 V
V
I
= 53 V
V
I
= 66 V
75
78
3.3
W
0
3.0
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
= 0.3...3.0 A, V
I
= 53 V
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
= 3.0 V
Short circuit current
I
sc
V
O
= 0.2...0.5V, T
C
=+25C
20 Hz...5 MHz
Line regulation
I
O
= 3 A
Load transient
recovery time
3.27
3.30
3.33
V
3.7
4.0
V
+45
+50
mV
150
mV
1.5
mV/C
3
ms
6
ms
9.9
W
3.2
3.4
3.7
A
4.1
A
20
50
mV
p-p
80
dB
mV
100
ms
0.6 ...50 MHz
3.17
3.43
V
Long term drift
included
V
I
= 38...60 V
Output adjust range
1)
1.75
4.08
V
I
O
= 0.3...3.0 A, V
I
= 53 V
load step = 1.5 A
60
dB
1)
See also Operating Information.
2)
See Typical Characteristics.
T
C
= +25C, I
O
= 2.0 A, V
I
= 53 V
Ramp-up time
Output current
I
O
= 3 A
Output ripple & noise
V
Oac
f = 100 Hz sine wave, 1V
p-p
, V
I
= 53 V
(SVR = 20 log (1 V
p-p
/V
Op-p
))
I
O
= 0.3...3.0 A
,
V
I
= 53 V
From V
I
connection to V
O
= 0.9 V
Oi
I
O
=
3 A,
0.1...0.9 V
O
, V
I
= 53 V
I
O
= 0.3...3 A, T
C
=+40...+90 C
SVR
Supply voltage rejection (ac)
V
I
= 50...72 V
+10
mV
Calculated value
30
170
mV
I
O
= 0.3...2.5 A
I
O
= 2.5...3.0 A
3.13
3.43
V
5
EN/LZT 146 86 R1A Ericsson Microelectronics AB, December 2001
-25
-30
+90
34
32
36
38
Temperature coefficient
Turn-on/turn-off input voltage
Output characteristic (typ)
Power derating
Efficiency (typ)
@ T
A
= +25C
PKF 4910A
EMC Specifications
During EMC measurements the PKF module is measured directly.
The fundamental switching frequency is 510 kHz 5% @
I
O
= (0.1...1.0) I
Omax
.
Conducted EMI (input teminals)
PKF 4910A without filter.
External Filter (class B)
Required external input filter in order to meet class B in EN
55022, CISPR 22 and FCC part 15J.
+
-
Supply
voltage
L1
C2
C3
C6
C5
C4
C1
L2
pin 18
pin 17
L1 = 51H ( Recommended part: Siemens B82790-S0513 )
L2 = 10H
C1, C2, C3 = 0.68 F
C4 = 22F
C5, C6 = 10nF
Load current (A)
Output Voltage (V)
0
1
2
3
4
5
0,0
0,5
1,0
1,5
2,0
2,5
3,0
3,5
4,0
The output voltage
deviation is deter-
mined by the load
transient (dI/dt)
Load change:
dI/dt
4 A/ms
Dynamic load response (typ) @ + 25 C
0.1 ms/div
2 A/div
200 mV/div
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