Crane Aerospace & Electronics Power Solutions
MFL sꢆꢇglꢂ ꢀꢇꢋ dꢉꢀl dc-dc cꢃꢇvꢂꢁꢅꢂꢁꢊ
28 VoLt input - 65 Watt
Features
pꢀꢁꢀllꢂl ꢃꢄꢂꢁꢀꢅꢆꢃꢇ wꢆꢅh ꢈꢉꢁꢁꢂꢇꢅ ꢊhꢀꢁꢂ,
ꢉꢄ ꢅꢃ 3 ꢉꢇꢆꢅꢊ (ꢉꢄ ꢅꢃ 185 wꢀꢅꢅꢊ)
•ꢀ -55° to +125°C operation
•ꢀ 16 to 40 VDC input
•ꢀ Transient protection up to 80 V for 50 ms
- converter will shut down above
approximately 45 volts in
•ꢀ Fully isolated, magnetic feedback
•ꢀ Fixed high frequency switching
•ꢀ Remote sense or output trim on
single output models
•ꢀ Inhibit function
MODELS
•ꢀ Sync in and Sync Out
•ꢀ Indefinite short circuit protection
VDC OꢀTPꢀT
SINGLE
3.3
DꢀAL
±5
•ꢀ High power density with up to 87% efficiency
5
±12
±15
12
15
28
description
The additional secondary current mode feedback loop improves
transient response in a manner similar to primary current mode
control and allows for ease of paralleling, but without the cost
and complexity.
The Interpoint™ MFL Series™ 28-volt dc-dc converters are rated
up to 65 watts. On dual output models up to 70% of the rated
output power can be drawn from either the positive or negative
output. These hermetically sealed converters are offered with
standard screening, “ES” screening, or fully compliant to “883”
MIL-PRF-38534 Class H screening. See “Table 9: Element
Evaluation” on page 13 and “Table 10: Environmental
Screening” on page 14. Standard microcircuit drawings (SMD)
are available. See “Table 3: SMD Number Cross Reference” on
page 5.
The constant frequency, pulse-width modulated converters use
a quasi-square wave single-ended forward design. Tight load
regulation is achieved through a wide-bandwidth magnetic
feedback circuit. The output on single MFL models can be
trimmed (see Figure 1 on page 2 for voltage changes with
different resistor values).
Design Features
inhibit
The MFL Series converters are switching regulators that use a
quasi-square wave, single ended forward converter design with a
constant switching frequency of 600 kHz.
The MFL Series converters have two inhibit terminals (INH1 and
INH2) that can be used to disable power conversion, resulting in
a very low quiescent input current and no generation of switching
noise. See Table 5 on page 6 for inhibit specifications.
Isolation between input and output circuits is provided with a
transformer in the forward path and a wide bandwidth magnetic
coupling in the feedback control loop. The MFL uses a unique
dual loop feedback technique that controls output current with
an inner feedback loop and an output voltage with a cascaded
voltage mode feedback loop.
sync
Converters may be synced to an external clock (525 to 675 kHz)
or to one another by using the sync in or out pins. The nominal
free-run switching frequency is 600 kHz.
Crane Aerospace & Electronics
Page 1 of 14
MFL Rev AB - 2013.11.05
Power Solutions – Interpoint Products
10301 Willows Road NE, Redmond, WA 98052
+1.425.882.3100 • power@crane-eg.com
www.craneae.com/interpoint