MHF2812SF 查看數據表（PDF） - Crane Aerospace and Electronics.

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MHF2812SF

MHF+ Single, Dual and Triple DC/DC Converters

Crane Aerospace and Electronics. 

Crane Aerospace & Electronics Power Solutions

MHF+ Single, Dual and Triple DC/DC Converters

28 VOLT INPUT – 15 WATT

FEATURES

• –55° to +125°C operation

• 16 to 40 VDC input (16 to 48 VDC triple)

• Fully isolated

• Optocoupler feedback

• Fixed frequency 550 kHz typical

- 450 kHz triple models

• Topology

- Single and dual: Single Ended Forward

- Triple: Current Mode Flyback

• Transient protection

- Single and dual: 50 V/50 ms

- Triple: 80 V/120 ms

• Inhibit and sync functions

• Indefinite short circuit protection

• Undervoltage lockout

• Up to 84% efficiency, 28 W/in3

- Up to 76% efficiency triple models

MODELS

VDC OUTPUT

SINGLE

3.3

5

5.2

12

15

28

DUAL

±5

±12

±15

TRIPLE

+5 & ±12

+5 & ±15

MHF+ SERIES™ SINGLE & DUAL

DC/DC CONVERTERS

The MHF+ Single and Dual Series™ of high frequency DC/DC

converters offers a wide input voltage range of 16 to 40 volts and up

to 15 watts of output power. The units are capable of withstanding

short term transients up to 50 volts. The package is a hermetically

sealed, welded metal case. Flanged and non-flanged models are

available.

CONVERTER DESIGN

The MHF+ converters are switching regulators that use a quasi-

square wave, single-ended forward converter design with a constant

switching frequency of 550 kHz. Isolation between input and output

circuits is provided with a transformer in the forward path and a

temperature compensated optical link in the feedback control loop.

For the MHF+ dual output models, good cross regulation is main-

tained by tightly coupled output magnetics. Up to 90% of the total

output power (80% on 2805D) is available from either output,

providing the opposite output is simultaneously carrying 10% of the

total output power (20% on 2805D models). Predictable current limit

is accomplished by directly monitoring the output load current and

providing a constant current output above the overload point.

HIGHER POWER DENSITY

The MHF+ Series offers a new standard of performance for small

size and high power density. At just 0.33 inch high and a total foot-

print of 1.7 in2, this low profile package offers a total power density

of up to 28 watts per cubic inch.

LOW NOISE, HIGH AUDIO REJECTION

The MHF+ converters’ feed-forward compensation system provides

excellent dynamic response and noise rejection. Audio rejection is

typically 50 dB. Typical output voltage response for a 50% to 100%

step load transient is as low as 1.3% with a 150 msec recovery time.

Input ripple current is typically 35 mA p-p with output ripple voltage

typically 30 mV p-p .

INHIBIT FUNCTION

MHF+ converters provide an inhibit terminal that can be used to

disable internal switching, resulting in no output and very low quies-

cent input current. The converter is inhibited when a TTL compatible

low (≤0.8 – output disabled) is applied to the inhibit pin. The unit is

enabled when the pin, which is internally connected to a pull-up

resistor, is left unconnected or is connected to an open-collector

gate. The open circuit output 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.

Crane Aerospace & Electronics

Electronics Group (Interpoint Brand)

PO Box 97005 • Redmond WA 98073-9705

425.882.3100 • electronics@craneae.com

www.craneae.com

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Rev K - 20060613

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