FEATURES • • • • • • • • • • • • • –55°C to +125° C operation 16 TO 40 VDC input Four fully regulated outputs Internal EMI filter meets MIL-STD-461C CE03 Active transient suppressor Built in hold-up function with flag Fully isolated Magnetic feedback Fixed frequency, 550 kHz typical Topology – Single Ended Forward Inhibit function Indefinite short circuit protection Undervoltage lockout DC/DC CONVERTERS 28 VOLT INPUT MQO SERIES 16 WATT MODELS VDC OUTPUT QUAD ±5 and ±12 ±5 and ±15 Size (max.): 3.200 x 2.600 x 0.460 inches (81.28 x 66.04 x 11.68 mm) See Section B8, case N, for dimensions. Weight: 120 grams typical Screening: Standard or ES. See Section C2 for screening options, see Section A5 for ordering information. DESCRIPTION The MQO Series™ of DC/DC converters supply up to 16.5 watts in a four output configuration of ±5 and ±12 or ±5 and ±15 VDC. An integral EMI filter and transient suppressor allow the converters to meet MIL-STD-461C standards without external components. An output hold-up feature provides a low power flag and full output power hold-up through transient dropout conditions. input power lines to allow meeting the CE03 interference and CS02 susceptibility requirements. The active internal transient suppressor provides protection against MIL-STD-704A, 1275, and 461C line transients. Protection is provided for transients up to 400 V from a 0.5 ohm source and 600 V from a 50 ohm source. BUILT-IN HOLD-UP FUNCTION WITH FLAG The MQO Series converters are packaged in hermetically sealed cases and are rated for full power operation from –55° to +125° C case temperature. This makes these units ideal for military, aerospace, and hi-rel industrial applications. A high gain bandwidth magnetically isolated control loop is used to precisely regulate the +5 VDC output. Constant frequency pulse width with a single ended forward topology is used. The –5 VDC output and the auxiliary outputs are independently controlled with low headroom regulators, eliminating cross regulation errors. The use of feedforward, compensation, and a high gain bandwidth control loop provides excellent rejection to the conducted audio spectrum of MIL-STD-704A-D and MIL-STD-461C. INTEGRAL EMI FILTER The MQO Series includes a a built-in EMI filter and transient suppressor which allow the units to meet the most common military standards without any external components. The internal EMI filter provides both differential and common mode attenuation on the An output hold-up feature provides a low power flag and full output power hold-up through transient drop out conditions. At full load for a Vin step from 28 to 0 volts, the minimum hold-up time will be 50 µs. The low power flag (TTL high) is asserted 10 µs before the end of the hold-up time. External capacitance can be added to extend hold-up time. SHORT CIRCUIT PROTECTION MQO Series converters provide predictable current limiters which directly sense output load current in the converter’s secondary. During short circuit or overload conditions, the current limiters provide constant output current and an input power fold-back. UNDERVOLTAGE LOCKOUT Undervoltage lockout prevents the converters from operating below approximately 12 VDC input voltage which helps keep system current levels smooth, especially during initialization or re-start operations. B2-53 MQO SERIES 16 WATT DC/DC CONVERTERS TYPICAL CHARACTERISTICS INHIBIT ABSOLUTE MAXIMUM RATINGS Input Voltage • 16 to 40 V Output Power • 16.75 watts Lead Soldering Temperature (10 sec per lead) • 300°C Storage Temperature Range (Case) • –65°C to +150°C Inhibit TTL Open Collector • Logic low (output disabled) • Referenced to input common • Logic high (output enabled) Open collector RECOMMENDED OPERATING CONDITIONS Input Voltage Range • 16 to 40 VDC continuous Case Operating Temperature (Tc) • –55°C to +125°C full power • –55°C to +135°C absolute Derating Output Power/Current • Linearly from 100% at 125°C to 0% at 135°C Undervoltage Lockout • 12 V input typical Isolation • 100 megohm minimum at 500 V Audio Rejection • Up to 50 dB Conversion Frequency • 550 kHz typical Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified. PARAMETER OUTPUT VOLTAGE OUTPUT CURRENT OUTPUT POWER VIN = 16 TO 40 VDC OUTPUT RIPPLE 10 kHz to 2 MHz LINE REGULATION LOAD REGULATION INPUT VOLTAGE INPUT CURRENT INPUT RIPPLE EFFICIENCY START-UP B2-54 CONDITION +5 –5 + AUX. – AUX. +5 –5 + AUX. – AUX. +5 –5 + AUX. – AUX. +5 –5 + AUX. – AUX. VIN = 16 TO 36 VDC +5 –5, ±AUX. MINIMUM LOAD TO FULL ±5 ± AUX. MINIMUM LOAD TO FULL Tc = –55° TO +125° C CONTINUOUS TRANSIENT 50 ms 0.5 OHM SOURCE 50 OHM SOURCE MINIMUM LOAD FULL LOAD INHIBITED 10 kHz TO 2 MHz DELAY MIN 4.95 4.95 11.90 11.90 390 0 0 0 1.95 0 0 0 — — — — — — — — MQO28512Q TYP 5.00 5.00 12.00 12.00 — — — — — — — — 50 — — — — — 20 50 MAX 5.05 5.05 12.10 12.10 2000 350 208 208 10.00 1.75 2.50 2.50 55 30 50 50 20 50 120 220 MIN 4.95 4.95 14.90 14.90 390 0 0 0 1.95 0 0 0 — — — — — — — — MQO28515Q TYP 5.00 5.00 15.00 15.00 — — — — — — — — 50 — — — — — 20 50 MAX 5.05 5.05 15.10 15.10 2000 350 167 167 10.00 1.75 2.50 2.50 55 30 50 50 20 50 120 220 16 28 40 16 28 40 — — — — — — — — — — — — — 50 64 20 400 600 230 960 10 — — — — — — — — — — — — — — — — 50 64 20 400 600 230 960 10 — — — UNITS VDC mA W mV p-p mV mV VDC V mA mA p-p % ms Input Common Inhibit Positive Input Transient Suppressor Voltage Regulator and Control EMI Filter 600 kHz Controller Ref. AMP and Ref. LHR Regulators 4 Output Power Converter Rectifier and Filters 8 10 6 4 5, 9 Positive Aux. Output Negative Aux. Output Negative 5 V Output Positive 5 V Output Output Common DC/DC CONVERTERS MQO SERIES 16 WATT FIGURE 1: MQO BLOCK DIAGRAM B2-55 DC/DC CONVERTERS MQO SERIES 16 WATT PIN OUT Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 Designation Inhibit Positive Input Input Common Positive 5 V Output Output Common Negative 5 V Output Low Power Flag Positive Aux.Output Output Common Negative Aux. Output Hold-up Common Positive Hold-up Input Case Ground 1 2 4 3 5 BOTTOM VIEW MQO 7 8 13 11 9 12 10 See Section B8, case N, for dimensions FIGURE 2: PIN OUT MODEL NUMBERING KEY MQO 28 512 Q / ES Base Model Input Voltage Output Voltage (Main and aux. Vout) Number of Outputs (Q = quad) Screening (Standard screening has no designator in this position.) B2-56 6 23624-001-DTS Rev A DQ# 3003 All technical information is believed to be accurate, but no responsibility is assumed for errors or omissions. Interpoint reserves the right to make changes in products or specifications without notice. MQO Series is a trademark of Interpoint. Copyright © 1991 - 1999 Interpoint. All rights reserved. CASES CASE N 2.600 max (66.04) CASE N TOP VIEW Cover Placement and Min/Max Dimensions See Figure 53 for pin configuration 3.200 max (81.28) Materials Header Cold Rolled Steel/Nickel/Tin Cover Cold Rolled Steel/Nickel/Tin Pins #52 alloy (all cases) compression glass seal Case dimensions in inches (mm) Tolerance ±0.005 (0.13) for three decimal places ±0.01 (0.2) for two decimal places unless otherwise specified CAUTION Heat from reflow or wave soldering may damage the device. Solder pins individually with heat application not exceeding 300°C for 10 seconds per pin. FIGURE 52: CASE N MAXIMUM DIMENSIONS B8-34 CASES CASE N CASE N MQO Series: Screening – Standard or ES 2.420 (61.47) Solder Seal 2.218 (56.34) 1.900 (48.26) 1 1.700 (43.18) 2 4 3 5 1.500 (38.10) 6 BOTTOM VIEW 1.300 (33.02) 7 1.100 (27.94) 8 0.900(22.86) Solder Tip-off 13 0.700 (17.78) 11 9 12 10 0.382 (9..70 0.180 (4.57) 2.850 (72.39) 2.650 (67.31) 2.540 (62.23) 0.550 (13.97) 0.350 (8.89) 0.000 0.150 (3.81) 0.240 / 0.260 (6.10 / 6.60) 0.467 (11.86) 0.032 / 0.040 (0.81 / 1.02) 0.000 0.000 FIGURE 53: CASE N DIMENSIONS B8-35 QA SCREENING 125°C PRODUCTS 125°C PRODUCTS TEST (125°C Products) STANDARD /ES /883 (Class H)* PRE-CAP INSPECTION Method 2017, 2032 yes yes yes TEMPERATURE CYCLE (10 times) Method 1010, Cond. C, -65°C to 150°C Method 1010, Cond. B, -55°C to 125°C no no no yes yes no CONSTANT ACCELERATION Method 2001, 3000 g Method 2001, 500 g no no no yes yes no BURN-IN Method 1015, 160 hours at 125°C 96 hours at 125°C case (typical) no no no yes yes no FINAL ELECTRICAL TEST MIL-PRF-38534, Group A Subgroups 1 through 6: -55°C, +25°C, +125°C Subgroups 1 and 4: +25°C case no yes no yes yes no HERMETICITY TESTING Fine Leak, Method 1014, Cond. A Gross Leak, Method 1014, Cond. C Gross Leak, Dip (1 x 10-3) no no yes yes yes no yes yes no FINAL VISUAL INSPECTION Method 2009 yes yes yes Test methods are referenced to MIL-STD-883 as determined by MIL-PRF-38534. *883 products are built with element evaluated components and are 100% tested and guaranteed over the full military temperature range of –55°C to +125°C. Applies to the following products MOR Series MHD Series MFLHP Series MHV Series MFL Series MHF+ Series MHP Series MHF Series** MTR Series MGA Series MQO Series** MSA Series MGH Series MCH Series FM-704A EMI Filter FMD**/FME EMI Filter FMC EMI Filter FMH EMI Filter FMGA EMI Filter FMSA EMI Filter HUM Modules** LCM Modules** LIM Modules **MFLHP Series, MQO Series, MHF Series, FMD EMI Filters, Hum Modules, and LCM Modules do not offer ‘883” screening. C2-10