MQFL-28V-1R5S
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High Reliability DC-DC Converter 16-40V Continuous Input |Meets all -704 and -1275D under-voltage transients Full Power Operation: The MilQor® series of high-reliability DC-DC converters brings SynQor's field proven high-efficiency synchronous rectifier technology to the Military/Aerospace industry. SynQor's innovative QorSeal® packaging approach ensures survivability in the most hostile environments. Compatible with the industry standard format, these converters operate at a fixed frequency, have no opto-isolators, and follow conservative component derating guidelines. They are designed and manufactured to comply with a wide range of military standards. MQFL series converters are: • Designed for reliability per NAVSO-P3641-A guidelines • Designed with components derated per: — MIL-HDBK-1547A — NAVSO P-3641A Features Qualification Process MQFL series converters are qualified to: • MIL-STD-810F — consistent with RTCA/D0-160E • SynQor's First Article Qualification — consistent with MIL-STD-883F • SynQor's Long-Term Storage Survivability Qualification • SynQor's on-going life test Fixed switching frequency No opto-isolators Parallel operation with current share Remote sense Clock synchronization Primary and secondary referenced enable Continuous short circuit and overload protection Input under-voltage and over-voltage shutdown Specification Compliance • AS9100 and ISO 9001 certified facility • Full component traceability • Temperature cycling • Constant acceleration • 24, 96, 160 hour burn-in • Three level temperature screening MQFL series converters (with MQME filter) are designed to meet: • MIL-HDBK-704-8 (A through F) • RTCA/DO-160 Section 16, 17, 18 • MIL-STD-1275 (B, D) • DEF-STAN 61-5 (part 6)/(5, 6) • MIL-STD-461 (C, D, E, F) • RTCA/DO-160(E, F, G) Section 22 Product# MQFL-28V-1R5S Phone 1-888-567-9596 www.SynQor.com Doc.# 005-0005187 Rev. 3

Technical Specification BLOCK DIAGRAM INPUT RETURN CURRENT SENSE ISOLATION STAGE GATE DRIVERS GATE DRIVERS OUTPUT RETURN CURRENT LIMIT REGULATION STAGE BOOST CONVERTER SWITCHES AND CONTROL ISOLATION BARRIER PRIMARY CONTROL SECONDARY CONTROL DATA COUPLING BIAS POWER CONTROL POWER TYPICAL CONNECTION DIAGRAM External bulk capacitor open means on + Load

Technical Specification Under-Voltage Transient Profile Boost-Converter is armed (or re-armed) when Vin exceeds this value Boost-Converter Operational Area Under-Voltage Transient Profile showing when the boost-converter is guaranteed to be operational. Before the boost converter will operate, it must first be armed (or re-armed) by making VIN greater than VARM. Note: This Under-Voltage Transient Profile is designed to comply (with appropriate margins) with all initial-engagement surges, starting or cranking voltage transients and under-voltage surges specified in: • MIL-STD-704-8 (A...

MQFL-28V-1R5S Output: 1.5V Ijsj: Current: 40A Parameter Specifications subject to change without notice

MQFL-28V-1R5S Output: 1.5V Current: 40A MQFL-28V-1R5S ELECTR Parameter Specifications subject to change without notice Electrical Characteristics Notes 1. Converter will undergo input over-voltage shutdown. 2. Derate output power to 50% of rated power at Tcase = 135°C (see Figure 5). 135°C is above specified operating range. 3. High or low state of input voltage must persist for about 200|js to be acted on by the lockout or shutdown circuitry. 4. Current limit inception is defined as the point where the output voltage has dropped to 90% of its nominal value. 5. Parameter not tested but...

Application Section BASIC OPERATION AND FEATURES The MQFL DC/DC converter uses a two-stage power conversion topology. The first, or regulation, stage is a buck-converter that keeps the output voltage constant over variations in line, load, and temperature. The second, or isolation, stage uses transformers to provide the functions of input/output isolation and voltage transformation to achieve the output voltage required. In the MQFL-28V series of converters the regulation stage is preceeded by a boost-converter that permits these converters to operate through various Military and Aircraft...

Application Section rent is increased. The lower the input voltage, the more these parameters are affected. mits the converter to be inhibited from either the input or the output side. Usually the converter has an EMI filter upstream of it, and the source voltage is connected to the input of this EMI filter. When, during compliance testing, the source voltage goes low during an under-voltage transient, the input to the converter will go even lower. This is because the inductance of the EMI filter (as well as the parasitic source inductance) will cause an oscillatory ring with the bulk...

Application Section regulation of the converter’s output. If they are left open, the converter will have an output voltage that is approximately 200mV higher than its specified value. If only the +SENSE pin is left open, the output voltage will be approximately 25mV too high. Inside the converter, +SENSE is connected to +Vout with a resistor value from 100W to 301W, depending on output voltage, and –SENSE is connected to OUTPUT RETURN with a 10W resistor. It is also important to note that when remote sense is used, the voltage across the converter’s output terminals (pins 7 and 8) will be...

MQFL-28V-1R5S Output: 1.5V ^ Current: 40A Whether or not converters are paralleled, the voltage at the SHARE pin could be used to monitor the approximate average current delivered by the converter(s). A nominal voltage of 1.0V represents zero current and a nominal voltage of 2.2V represents the maximum rated current, with a linear relationship in between. The internal source resistance of a converter's SHARE pin signal is 2.5 kW. During an input voltage fault or primary disable event, the SHARE pin outputs a power failure warning pulse. The SHARE pin will go to 3V for approximately 14ms as...