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MHF2812DF/883 Datasheet(PDF) 1 Page - Interpoint Corporation Company |
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MHF2812DF/883 Datasheet(HTML) 1 Page - Interpoint Corporation Company |
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1 / 21 page  1 Size (max.): Non flanged 1.460 x 1.130 x 0.330 (37.08 x 28.70 x 8.38 mm) Flanged 2.005 x 1.130 x 0.330 (50.93 x 28.70 x 8.38 mm) Weight: 30 grams maximum. Screening: Standard, ES, or 883 (Class H). DESCRIPTION The MHF+ 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 tran- sients 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. SYNCHRONIZATION A synchronization feature is included with the MHF+ Series that allows the user to match the switching frequency of the converter to the frequency of the system clock. An external synchronization feature is included that allows the user to adjust the nominally 550 kHz operating frequency to any frequency within the range of 500 kHz to 600 kHz. This is initiated by applying a TTL compatible input of the desired frequency to pin 5. SHORT CIRCUIT PROTECTION MHF+ Series converters provide short circuit protection by restricting the output current to approximately 115% of the full load output current. The output current is sensed in the secondary stage to provide highly predictable and accurate current limiting, and to eliminate foldback characteristics. UNDERVOLTAGE LOCKOUT Undervoltage lockout prevents the units from operating below approximately 12 VDC input voltage to keep system current levels smooth, especially during initialization or re-start operations. DC/DC CONVERTERS 28 VOLT INPUT MHF+ SERIES SINGLE & DUAL 15 WATT FEATURES • –55° to +125°C operation • 16 to 40 VDC input • Fully isolated • Optocoupler feedback • Fixed frequency, 550 kHz typical • Topology – Single Ended Forward • 50 V for up to 50 ms transient protection • Inhibit and sync functions • Indefinite short circuit protection • Undervoltage lockout • Up to 84% efficiency, 28 W/in3 MODELS VDC OUTPUT SINGLE 3.3 5 5.2 12 15 28 DUAL ±5 ±12 ±15 |
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