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SMHF283R3S/KR Datasheet(PDF) 1 Page - Interpoint Corporation Company |
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SMHF283R3S/KR Datasheet(HTML) 1 Page - Interpoint Corporation Company |
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1 / 15 page  description The Interpoint® SMHF Series™ of 28 volt dc-dc converters offers a wide input voltage range of 16 to 45 volts and up to 15 watts of output power. The units are capable of withstanding transients up to 50 volts for up to 50 ms. Screening SMHF converters offer screening to Class H or K and radiation hardness assurance (RHA) levels P - 30 krad(Si), L - 50 krad(Si) or R - 100 krad(Si). Single event effects (SEE) LET performance to 86 MeV cm2/mg. See Table 10 on page 15 for more information. converter DeSign The SMHF converters are switching regulators that use a quasi-square wave, single-ended forward converter design with a constant switching frequency of 550 kHz typical. Isolation between input and output circuits is provided with a transformer in the forward path and a temperature compensated opto-coupler in the feedback control loop. The opto-coupler is radiation tolerant and is especially selected for space applications. Dual output models maintain cross regulation with tightly coupled output magnetics. Up to 70% of the total output power is available from either output, providing the opposite output is simultaneously carrying 30% of the total output power. Predictable current limit is accomplished by directly monitoring the output load current and providing a constant current output above the overload point. The SMHF converter’s 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 1.8% with a 150 µs recovery time, typical. See Table 5 on page 5 for more information. SMHF 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 low. 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. See Table 5 on page 5 for more information. The SMHF Series’ synchronization feature allows the user to match the switching frequency of the converter to the frequency of the system clock. This allows the user to adjust the nominal 550 kHz operating frequency to any frequency within the range of 500 kHz to 600 kHz by applying a compatible input of the desired frequency to pin 5. SMHF Series converters provide short circuit protection by restricting the output current to approximately 140% 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 prevents the units from operating below approximately 14 volts input to keep system current levels smooth, especially during initialization or re-start operations. Features • Radiation tolerant space dc-dc converter - Single event effects (SEE) LET performance to 86 MeV cm2/mg - Total ionizing dose (TID) guaranteed per MIL-STD-883 method 1019, radiation hardness assurance (RHA) P = 30 krad(Si), L = 50 krad(Si), R = 100 krad(Si) - 50 - 300 rad(Si)/sec dose rate (Condition A) - 10 mrad(Si)/sec dose rate (Condition D) • Operating temperature -55°C to +125°C • Qualified to MIL-PRF-38534 Class H and K • Input voltage range 16 to 45 volts • Transient protection 50 volts for 50 ms • Fully isolated • Fixed high frequency switching • Inhibit function • Synchronization input • Indefinite short circuit protection • Undervoltage lockout MODELS OUTPUT VOLTAgE (V) SINgLE DUAL 3.3 ±5 5 ±12 5.2 ±15 12 15 sMHF single and dual dc-dc converters Crane Aerospace & Electronics Power Solutions - Interpoint Products 10301 Willows Road NE, Redmond, WA 98052 +1 425-882-3100 • power@crane-eg.com www.craneae.com/interpoint Page 1 of 15 16-45 Volt input – 15 Watt SMHF Rev AF - 2015.10.28 Crane Aerospace & Electronics Power Solutions |
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