offers a wide input voltage range of 16 to 50 volts and up to 25
watts of output power. The units are capable of withstanding
transients of up to 65 volts for up to one second. The package
is a hermetically sealed, welded metal case. Flanged and
non-flanged models are available.
i
nHibit
F
unCtion
C
onverter
D
esign
The MFK converters are switching regulators that use a quasi-
square wave, single-ended forward converter design with a
constant switching frequency of 500 kHz, typical. Isolation
between input and output circuits is provided with transformers in
the forward path and in the feedback control loop.
MFK converters provide an inhibit terminal that can be used to
disable internal switching, resulting in no output and very low
quiescent input current. The converter is inhibited when an active
low (≤0.8 V – output disabled) is applied to the inhibit pin. The
unit is enabled when the pin, which is internally connected to a
pull-up current source, is left unconnected or is connected to an
open-collector gate. The open circuit voltage associated with the
inhibit pin is 8.5 to 12 V. In the inhibit mode, a maximum of 4 mA
must be sunk from the inhibit pin. See Table 5 on page 5 for
more information.
s
ynCHronizAtion
H
igHer
P
ower
D
ensity
The MFK Series offers a new standard of performance for small
size and high power density. At just 0.360 inch high and a total
footprint of 1.7 in
2
, this low profile package offers a total power
density of up to 42 watts per cubic inch.
L
ow
n
oise
, H
igH
A
uDio
r
ejeCtion
A synchronization feature is included with the MFK Series that
allows the user to match the switching frequency of the converter
to the frequency of a system clock. Synchronization allows
the user to adjust the nominal 500 kHz operating frequency to
any frequency within the range of 450 kHz to 550 kHz. This is
initiated by applying an active high input of the desired frequency
to the sync pin. See Table 5 on page 5 for more information.
The MFK converters current mode control system provides
excellent dynamic response and noise rejection. Audio rejection
is typically 50 dB. Output voltage response for a 50% to 100%
step load transient is as low as 4% with a 400 µs recovery time.
Input ripple current is typically 35 mA p-p with output ripple
voltage 30 mV p-p at 2 MHz BW.
s
Hort
C
irCuit
P
roteCtion
MFK Series converters provide short circuit protection by
restricting the output current to approximately 115% of the full
load output current.
u
nDervoLtAge
L
oCkout
Undervoltage lockout with hysteresis prevents the units from
operating below approximately 15 volts input voltage to keep
system current levels smooth, especially during initialization or
re-start operations.
Crane Aerospace & Electronics
Power Solutions – Interpoint Products
10301 Willows Rd. NE, Redmond, WA 98052
+1.425.882.3100 • power@crane-eg.com
www.craneae.com/interpoint
MFK Rev AB - 2014.10.27
Page 1 of 16
Crane Aerospace & Electronics Power Solutions
MFK Single and Dual DC-DC Converters
28 Volt input –
25 Watt
28 Volt input –
25 Watt
Positive
Input
Positive
Output
Input
Common
Output
Common
Inhibit 1
Bias
Supply
FET
Driver
Secondary V
CC
V
S+
V
In
UVLO
PWM
Controller
+
_
+
_
V
Ref
Secondary V
CC
Sync In
F
igure
1: MFk s
ingLe
b
LoCk
D
iAgrAM
Positive
Output
Positive
Input
Output
Common
Input
Common
Negative
Output
Inhibit 1
Bias
Supply
FET
Driver
Secondary V
CC
V
S+
V
In
UVLO
PWM
Controller
+
_
+
_
V
Ref
Secondary V
CC
Sync In
F
igure
2: MFk D
uAL
b
LoCk
D
iAgrAM
www.craneae.com/interpoint
MFK Rev AB - 2014.10.27
Page 2 of 16
Crane Aerospace & Electronics Power Solutions
MFK Single and Dual DC-DC Converters
28 Volt input –
25 Watt
28 Volt input –
25 Watt
pin out
pin
1
2
3
4
5
6
7
8
single output
Inhibit
Output Common
Positive Output
Sync
Case Ground
Input Common
Positive Input
—
mFK2828s
Inhibit
Positive Output
No Connection
Output Common
Sync
Case Ground
Input Common
Positive Input
t
AbLe
1: P
in
o
ut
dual output
Inhibit
Positive Output
Output Common
Negative Output
Sync
Case Ground
Input Common
Positive Input
Inhibit
Sync
pins not in use
Leave unconnected
Leave unconnected
t
AbLe
2: P
ins
n
ot in
u
se
Dot on top of cover
indicates pin one.
Dot on top of cover
indicates pin one.
BOTTOM VIEW
SINGLES EXCEPT 28
NON-FLANGED OR FLANGED
7
6
5
1
2
3
4
BOTTOM VIEW
28 SINGLE AND ALL DUALS
NON-FLANGED OR FLANGED
8
7
6
1
2
3
4
5
Dotted line outlines flanged package option.
See Figure 6 on page 11 and Figure 8 on page 13 for dimensions.
Dotted line outlines flanged package option.
See Figure 7 on page 12 and Figure 9 on page 14 for
dimensions.
F
igure
3: MFk s
ingLe
P
in
o
ut
(
exCePt
28s)
F
igure
4: MFk D
uAL
P
in
o
ut
(
inCLuDes
28s)
www.craneae.com/interpoint
MFK Rev AB - 2014.10.27
Page 3 of 16
Crane Aerospace & Electronics Power Solutions
MFK Single and Dual DC-DC Converters
28 Volt input –
25 Watt
28 Volt input –
25 Watt
model numbering Key
Base Model
Input Voltage
MFK
28 12
D
F / 883
S
tandard
M
icrOcircuit
d
rawing
(SMd)
5962-1421001HXC IN PROCESS
5962-1421101HXC IN PROCESS
5962-1421201HXC IN PROCESS
5962-1421301HXC IN PROCESS
5962-1421401HXC IN PROCESS
5962-1421501HXC IN PROCESS
5962-1421601HXC IN PROCESS
5962-1421701HXC IN PROCESS
5962-1421801HXC IN PROCESS
5962-1421901HXC IN PROCESS
5962-1422001HXC IN PROCESS
smd numbers
MFK S
iMilar
p
art
MFK281R8S/883
MFK282R5S/883
MFK283R3S/883
MFK2805S/883
MFK2812S/883
MFK2815S/883
MFK2828S/883
MFK2805D/883
MFK2807D/883
MFK2812D/883
MFK2815D/883
Output Voltage
(R = decimal point, 3R3 = 3.3 Vout)
Number of Outputs
(S = single, D = dual)
Case Option
(Non-flanged case has no designator in
this position)
Screening
(Standard screening has no designator
in this position.)
F
igure
5: M
oDeL
n
uMbering
k
ey
To indicate the flanged case option change the “X” to “Z” In the
SMD number. The SMD number shown is for Class H screening,
non-flanged. For exact specifications for an SMD product, refer to the
SMD drawing. SMDs can be downloaded from:
http://www.dscc.dla.mil/programs/smcr
t
AbLe
3: sMD C
ross
r
eFerenCe
t
O
category
base model and
input Voltage
deterMine the MOdel nuMber enter One OptiOn FrOM
output Voltage
1
1R8, 2R5, 3R3,
05, 12, 15, 28
05, 07, 12, 15
each categOry in the FOrM belOw
.
number of
outputs
2
S
D
case options
3
screening
4
(standard, leave blank)
ES
883
model number options
(non-flanged, leave blank)
F (flanged)
options
Fill in For
model #
MFK28
MFK28
/
Notes:
1. Output Voltage: An R indicates a decimal point. 1R8 is 1.8 volts out. The value of 1R8, 2R5 and 3R3 are only available in single output models.
2. Number of Outputs: S is a single output and D is a dual output.
3. Case Options: For the standard case, Figure 6 on page 11 or Figure 7 on page 12, leave the case option blank. For the flanged case option, Figure 8 on page
13 or Figure 9 on page 14, insert the letter F in the Case Option position.
4. Screening: For standard screening leave the screening option blank. For other screening options, insert the desired screening level. For more information see
Table 11 on page 15 and Table 12 on page 16.
t
AbLe
4: M
oDeL
n
uMber
o
Ptions
www.craneae.com/interpoint
MFK Rev AB - 2014.10.27
Page 4 of 16
Crane Aerospace & Electronics Power Solutions
MFK Single and Dual DC-DC Converters
28 Volt input –
25 Watt
28 Volt input –
25 Watt
t
AbLe
5: o
PerAting
C
onDitions
, A
LL
M
oDeLs
: 25°C
CAse
, 28 v
in
, 100%
LoAD
,
unLess otHerwise sPeCiFieD
.
MFK SERIES
PARAMETER
LEAD SOLDERING TEMPERATURE
1
STORAGE TEMPERATURE
1
CASE OPERATING
TEMPERATURE
DERATING OUTPUT POWER/CURRENT
1
ESD RATING
1
MIL-PRF-38534, 3.9.5.8.2
ISOLATION: INPUT TO OUTPUT OR ANY
PIN TO CASE EXCEPT CASE PIN
UNDERVOLTAGE LOCKOUT
FULL POWER
ABSOLUTE
1
LINEARLY
MIL-STD-883, METHOD 3015
CLASS 2
500 VDC AT 25°C
ALL MODELS
CONDITIONS
10 SECONDS MAX.
MIN
—
-65
-55
-55
TYP
—
—
—
—
MAX
300
+150
+125
+135
UNITS
°C
°C
°C
From 100% at 125°C to 0% at 135°C
2000 - 3999
100
—
—
15
60
115
50
—
—
—
—
—
—
—
—
—
—
570
550
60
0.8
5.0
V
Megohms
V
pF
%
dB
kHz
kHz
%
V
INPUT TO OUTPUT CAPACITANCE
CURRENT LIMIT
2
AUDIO REJECTION
1
CONVERSION FREQUENCY
SYNCHRONIZATION
1
—
% OF FULL LOAD
FREE RUN -55°C TO +125°C
INPUT FREQUENCY
DUTY CYCLE
1
ACTIVE LOW
ACTIVE HIGH
1
REFERENCED TO
IF NOT USED
—
—
430
450
40
—
4.5
INPUT COMMON
LEAVE UNCONNECTED
—
—
—
—
0.8
4
V
mA
INHIBIT ACTIVE LOW (OUTPUT DISABLED)
Do not apply a voltage to the inhibit pin
4
INHIBIT PIN PULLED LOW
3
INHIBIT PIN SOURCE
CURRENT
1
REFERENCED TO
INPUT COMMON
OPEN COLLECTOR OR
UNCONNECTED
8.5
—
12
V
INHIBIT ACTIVE HIGH (OUTPUT ENABLED)
Do not apply a voltage to the inhibit pin
4
INHIBIT PIN CONDITION
OPEN PIN VOLTAGE
1
For mean time between failures (MTBF) contact Applications Engineering
powerapps@crane-eg.com +1.425.882.3100 option 7
Notes:
1. Guaranteed by qualification test and/or analysis. Not an in-line test.
2. Dual outputs: The over-current limit will trigger when the sum of
the currents from both outputs reaches 115% (typical value) of the
maximum rated “total” current of both outputs.
3. Tested with inhibit pin pulled to ground.
4. An external inhibit interface should be used to pull the inhibit low or
leave it floating. The inhibit pin can be left unconnected if not used.
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