MQFL-28-1R5S
19Pages

High Reliability DC-DC Converter 16-40V Continuous Input Full Power Operation: -550C to +1250C 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-28-1R5S Phone 1-888-567-9596 www.SynQor.com Doc.# 005-2MQ1R5S Rev. F 0

Technical Specification BLOCK DIAGRAM INPUT RETURN ISOLATION STAGE CURRENT SENSE CURRENT LIMIT ISOLATION BARRIER OUTPUT RETURN GATE DRIVERS PRIMARY CONTROL POSITIVE OUTPUT REGULATION STAGE POSITIVE INPUT SECONDARY CONTROL CONTROL POWER TYPICAL CONNECTION DIAGRAM open means on + Load

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. 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 guaranteed to the limit specified. 6. Load current transition time > 10js. 7. Settling time measured from start of transient to the point...

Figure 1: Efficiency at nominal output voltage vs. load current for minimum, nominal, and maximum input voltage at Tcase=25°C. Figure 2: Efficiency at nominal output voltage and 60% rated power vs. case temperature for input voltage of 16V, 28V, and 40V. 16 Figure 3: Power dissipation at nominal output voltage vs. load current for minimum, nominal, and maximum input voltage at Tcase=25°C. Figure 4: Power dissipation at nominal output voltage and 60% rated power vs. case temperature for input voltage of 16V, 28V, and 40V. 1.8 Figure 5: Output Current / Output Power derating curve as a...

Technical Figures Figure 7: Turn-on transient at full resistive load and zero output capacitance initiated by ENA1. Input voltage pre-applied. Ch 1: Vout (500mV/div). Ch 2: ENA1 (5V/div). Figure 8: Turn-on transient at full resistive load and 10mF output capacitance initiated by ENA1. Input voltage pre-applied. Ch 1: Vout (500mV/div). Ch 2: ENA1 (5V/div). Figure 9: Turn-on transient at full resistive load and zero output capacitance initiated by ENA2. Input voltage pre-applied. Ch 1: Vout (500mV/div). Ch 2: ENA2 (5V/div). Figure 10: Turn-on transient at full resistive load and zero output...

Technical Figures Figure 13: Output voltage response to step-change in input voltage (16V 50V - 16V). Load cap: 10µF, 100mΩ ESR tantalum cap and 1µF ceramic cap. Ch 1: Vout (200mV/div). Ch 2: Vin (20V/div). Figure 14: Test set-up diagram showing measurement points for Input Terminal Ripple Current (Figure 15) and Output Voltage Ripple (Figure 16). Figure 15: Input terminal current ripple, ic, at full rated output current and nominal input voltage with SynQor MQ filter module (50 mA/div). Bandwidth: 20MHz. See Figure 14. Figure 16: Output voltage ripple, Vout, at nominal input voltage and...

Output Impedance (ohms) Figure 19: Magnitude of incremental output impedance (Zout = vout/iout) for minimum, nominal, and maximum input voltage at full rated power. Figure 20: Magnitude of incremental forward transmission (FT = vout/ vin) for minimum, nominal, and maximum input voltage at full rated power. 100 Input Impedance (ohms) Figure 21: Magnitude of incremental reverse transmission (RT = iin/iout) for minimum, nominal, and maximum input voltage at full rated power. Figure 22: Magnitude of incremental input impedance (Zin = vin/iin) for minimum, nominal, and maximum input voltage at...

Application Section BASIC OPERATION AND FEATURES tional control features provided by the MQFL converter. 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. CONTROL FEATURES Both the regulation and the isolation stages switch at a fixed frequency for predictable EMI...

Application Section REMOTE SENSE: The purpose of the remote sense pins is to correct for the voltage drop along the conductors that connect the converter’s output to the load. To achieve this goal, a separate conductor should be used to connect the +SENSE pin (pin 10) directly to the positive terminal of the load, as shown in the connection diagram on Page 2. Similarly, the –SENSE pin (pin 9) should be connected through a separate conductor to the return terminal of the load. NOTE: Even if remote sensing of the load voltage is not desired, the +SENSE and the -SENSE pins must be connected to...