PKF 4221 ASI
DC/DC power module
±9V to ±15V / 0.85A / 15W
• SMD and through-hole versions with
ultra low component height 8.0 mm
(0.315 in.)
• 84% efficiency at full load
• 1,500 Vdc isolation voltage
• MTTF >10 million hours at +50°C
case temperature
• Low EMI
• Wide output trim
The MacroDens™ 15W PKF 4221A SI series true
component level on-board DC/DC power modules are
intended as distributed power sources in decentralized
–48 and –60VDC 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.
E
Absolute Maximum Ratings
Characteristics
T
C
T
S
V
I
V
ISO
E
tr
V
RC
V
adj
Case temperature at full output power
Storage temperature
Continuous input voltage
1)
Isolation voltage
(input to output test voltage)
Transient input energy
Remote control voltage pin 10,11 ref. to pin 17
Output adjust voltage pin 8,9 ref. to pin 17
-5
-5
min
-45
-55
-0.5
1,500
0.01
+16
+40
max
+100
+125
+80
Unit
°C
°C
Vdc
Vdc
Ws
Vdc
Vdc
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.
Input
T
C
< T
Cmax
unless otherwise specified
Notes:
Characteristics
V
I
V
Ioff
V
Ion
C
I
P
Ii
P
RC
Input voltage range
1)2)
Turn-off input voltage
Turn-on input voltage
Input capacitance
Input idling power
Input stand-by power
I
O
= 0, T
C
=–30…+95°C
T
C
=–30…+95°C,
RC connected to pin 17
(V
I
=53V)
(V
I
=66V)
(V
I
=53V)
(V
I
=66V)
27
42
See typical characteristics
See typical characteristics
Conditions
min
36
30.0
32.0
typ
max
75
Unit
V
V
V
µ
F
1)
33.5
34.5
1.4
35.0
36.0
The input voltage range 36…75 V dc meets
the European Telecom Standard prETS
300 132-2 Nominal input voltage 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 continuous input voltage
is 80 Vdc.
The power module will operate down to
≤ 35V,
when VI decreases, but will turn on to at
VI
≤ 36V,
when VI increases
(see also Operating information).
2)
340
360
mW
mW
Connections
Pin
1
2
3
4-6
7
8
9
10
11
12–16
17
18
Designation
Out 1
Rtn
Out 2
NC
Sync
V
adj
NOR
TOR
RC
NC
–In
+In
Function
Output 1(+).
Output return.
Output 2(-).
Not connected. Galvanically Isolated from input pins.
Synchronization input.
Output voltage adjust.
Connection of Nominal Output voltage Resistor.
Turn-on/off input voltage adjust.
Remote control and turn-on/off input voltage adjust.
Not connected. Galvanically isolated from input pins.
Negative input.
Positive input.
18 17 16 15 14 13 12 11 10
1
2
3
4
5
6
7
8
9
Note: Galvanic isolation is verified in an electric strenght test. Test voltage is 1.500 Vdc for 60s In
production the test duration may be decreased to 1 s.
2
EN/LZT 146 040 R1A © Ericsson Power Modules AB, October 2003
Safety
The PKF 4221 ASI DC/DC power module meets the
requirements of
UL/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
equipment and considerations should be given to measuring
the case temperature to comply with T
Cmax
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
requirements for SELV (<60Vdc), the output is considered
to remain within SELV limits (level 3). The isolation is an
operational 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 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 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 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 1nF and
the leakage current is less than 1µA @ 53 Vdc.
The case is designed in non-conductive epoxy. Its flammability
rating meets UL 94V-0. The oxygen index is 34%.
Electrical Data
Fundamental circuit diagram, Dual output
Transient input voltage
Single voltage pulse at +25°C ambient temperature.
EN/LZT 146 040 R1A © Ericsson Power Modules AB, October 2003
3
Output
T
C
= –30…+95 °C, V
I
= 36...75 V and pin 8 connected to pin 9, unless otherwise specified.
Output 1
Characteristics
Conditions
Min
Output voltage initial
V
Oi
setting and accuracy
Output adjust range
1)
Output voltage
tolerance band
Idling voltage
V
O
Line regulation
I
O1
= I
O2
= 0.62A
Long term drift
included
I
O1
= I
O2
= 0A
V
I
= 36 ... 60V
V
I
= 50 ... 75V
I
O
= 0.062 ... 0.62A
T
C
= +25°C, I
O1
= I
O2
= 0.3A, V
I
= 53V
8.85
11.52
13.4
-80
-50
-170
100
I
O1
= I
O2
= 0.62A V
I
=53V, load step = 0.16A
V
tr
T
coeff
t
r
t
s
I
O
P
O max
I
lim
I
sc
Load transient voltage
-300
Temperature coefficient
Ramp-up time
Start-up time
Output current
Max output power
2)
Current limiting threshold
3)
Short circuit current
Calculated value
T
C
< T
C max,
V
O
= 10V
V
O
= 0.2 ... 0.5V, T
A
= + 25°C
20Hz … 5MHz
V
O ac
Output ripple & noise
I
O
=0.8 A
0.6 ... 50MHz
SVR
Supply Voltage Rejection (ac)
f = 100 Hz sine wave, 1 V
p-p
, V
I
= 53 V
(SVR = 20 log (1 V
p-p
/V
Op-p
))
55
80
55
80
dBµV
dB
I
O
=0.62 A, T
p
= +40 ... +90ºC
I
O
=0.1 ... 1.0 I
O max,
0.1 ... 0.9 V
o,
V
I
= 53V
I
O
=0.1 ... 1.0 I
O max,
53V to 0.9 V
O
0
15
1.6
2
30
100
-3.5
2
5
0.85
0
15
1.6
2
30
100
-400
-3.5
2
ms
5
0.85
A
W
A
A
mV
p-p
mV/ºC
+300
15.25
12.48
8.85
11.52
13.4
-80
mV
-50
-170
100
+380
mV
mV
µ
s
Output 2
Unit
Max
12.18
Min
11.82
Typ
12.00
Max
12.18
V
15.25
12.48
V
Typ
12.00
11.82
Load regulation
t
tr
Load transient recovery time
I
O1
= I
O2
= 0.062 ... 0.62A
Simultaneously, V
I
= 53V
See also Operating Information.
See Typical Characteristics.
3)
I
lim
on each output is set by the total load.
1)
2)
Miscellaneous
Characteristics
Conditions
V
I
= 53V
Efficiency
I
O1
= I
O2
= 0.62A
P
d
Power dissipation
V
I
= 66V
V
I
= 53V
V
I
= 66V
fo
min
81
81
typ
84
max
Unit
η
%
83
3.0
W
3.0
485
510
525
kHz
Operating frequency
4
EN/LZT 146 040 R1A © Ericsson Power Modules AB, October 2003
Typical Characteristics
[%]
87
86
Efficiency (typ) @ T
A
= +25°C
[W]
18
15
Power derating
[A]
0.7
0.6
0.5
0.4
0.3
0.2
0.1
Cross regulation output 1 (+12V)
85
12
9
6
3
0
-50
Load Current Output 1
Max output Power
Effiency
84
83
82
81
0.0
0.1 0.2
36 V
53 V
75 V
Operating area for
+/- 4 % tolerance
0.3
0.4 0.5 0.6
0.7
0.8
[A]
-40
-30
+80
+90 +100 +110 +120
[˚C]
0.0
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
[A]
Load Current
Case Temperature
Load Current Output 2
[A]
0.7
Cross regulation output 2 (-12V)
[V]
14.2
Temperature coefficient
[V]
37
36
Turn-on/turn-off input voltage
38
Load Current Output 1
0.6
Output voltage
0.5
0.4
0.3
0.2
Operating area for
+/- 4 % tolerance
Turn-on/Turn-off voltage
13.4
35
Turn-on
34
33
32
31
Turn-off
12.6
11.8
11.0
0.1
0.0
0.0
10.2
0.1
0.2
0.3
0.4
0.5
0.6
0.7
[A]
-30
-10
10
30
50
70
90 [˚C]
-30 -14.3
1.2 16.8
32.5
48.1 63.7 79.3 95
[˚C]
Load Current Output 2
Case Temperature
Case Temperature
EMC Specifications
The PKF power module is mounted on a double sided Printed
circuit Board (PB) with ground plane during EMC measurements.
The fundamental switching frequency is 510 kHz ±5% @
I
O
= (0.1…1.0) × I
O
max
.
External Filter (class B)
Required external input filter in order to meet class B in
EN 55022, CISPR 22 and FCC part 15J.
L1 = 884 µH
C1, C2 = 680 nF
C5, C6 = 6.8 nF
+
Supply
voltage
-
pin 17
C1
C2
C5
L1
pin 18
(pulse PO473)
C6
Conducted EMI (input teminals)
4221A SI without filter.
4221A SI with filter.
EN/LZT 146 040 R1A © Ericsson Power Modules AB, October 2003
5
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