description

offers a wide input voltage range of 16 to 50 volts and up

to 25 watts of output power. The converters 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.

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.

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

density of up to 42 watts per cubic inch.

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.

The MFK Series converters are provided with internal filtering

capacitors that help reduce the need for external components

in normal operation. Use our FMCE-0328 EMI filter to meet

the requirements of MIL-STD-461C CE03 and CS01 and/or

MIL-STD-461D, E and F CE102 and CS101 levels of conducted

emissions.

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 the

inhibit pin is pulled below 0.8 volts. The converter 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.

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.

MFK Series converters provide short circuit protection by

restricting the output current to approximately 115% of the full

load output current.

Undervoltage lockout with hysteresis prevents the converters

from operating below approximately 15 volts input voltage to

keep system current levels smooth, especially during initialization

or re-start operations.

Features

• 16to50voltinput

• AvailabletoClassH,MIL-PRF-38534

• Undervoltagelockout

• -55°Cto+125°Coperation

• Fullyisolated

• Magneticfeedback

• Fixedfrequency,500kHztypical

• 65voltsforupto1sec.transient

protection

• Inhibitandsyncfunction

• Outputshortcircuitprotection

MOdeLs

SINGLE

DUAL

1.8

±5

2.5

±7

3.3

±12

5

±15

5.2

5.7

12

15

28

Crane Aerospace & Electronics Power Solutions

MFKsingleanddualdC-dCConverters

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

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