Features: ` Total Dose > 25K Rad(Si)
` SEE > 37 MeV `cm2/mg
` Internal EMI filter; Converter Capable of meeting MIL-STD-461C CE03 and CS01
` Low Weight, < 85 grams
` Magnetically Coupled Feedback
` 16V to 50V DC Input Range
` Up to 25W Output Power
` Single and Dual Output Models Include 3.3, 5, 12, 15, ±5, ±12 and ±15V
` High Efficiency - to 82%
` -55°C to +125°C Operating Temperature Range
` 100M @ 500VDC Isolation
` Under-Voltage Lockout
` Short Circuit and Overload Protection
` Output Over Voltage Limiter
` Adjustable Output Voltage
` External Inhibit
` 1,500,000 Hour MTBFApplication ·Low Earth Orbit Satellites (LEO)
·Launch VehiclesSpecificationsInput voltage range ..................... -0.5Vdc to +60Vdc
Input voltage range ........................16Vdc to +60Vdc
Output power................................. Internally limited
Input voltage range1..................... 16Vdc to +38Vdc
Lead temperature ...................+300for 10 seconds
Output power................................... 0 to Max. Rated
Operating temperature .................... -55 to +135
Operating temperature2................... -55 to +125
Storage temperature ....................... -55 to +135
Operating temperature1..................... -55 to +70
1 Meets derating per MIL-STD-975
2 For operation at +125 see table note 13
DescriptionThe L-Series of DC/DC converters PD - 94519A are radiation tolerant, high reliability devices designed for moderate radiation environments such as those encountered by low earth orbit satellites and launch vehicles. For higher radiation environments, the G-Series of DC/DC converters is recommended. Features of PD - 94519A include small size, low weight and a high tolerance to total ionizing dose, single event effects and environmental stresses such as temperature extremes, mechanical shock, and vibration. All components are fully derated to meet the requirements of MIL-STD-975 and MIL-STD-1547 and GSFC PPL-21 Appendix B. Extensive documentation of PD - 94519A including Radiation Susceptibility, Thermal Analysis, Stress Analysis and MTBF are available.
The converters PD - 94519A incorporate a fixed frequency single forward topology with magnetic feedback and an internal EMI filter. These converters are capable of meeting the conducted emissions and conducted susceptibility requirements of MIL-STD-461C without any additional components. All models include an external inhibit port and have an adjustable output voltage. PD - 94519A are enclosed in a hermetic 1.5" x 2.3" x 0.425" steel package and weigh less than 85 grams. The package utilizes rugged ceramic feed-through copper core pins and is sealed using parallel seam welding.
Full environmental screening of PD - 94519A includes temperature cycling, constant acceleration, fine and gross leak, and burn-in.
Non-flight versions of the L-Series converters PD - 94519A are available for system development purposes. Variations in electrical specifications and screening to meet custom requirements can be accommodated.
PD - 94519A Data Sheet
