500W DC-DC Converters are Proton Rad Hard 100K+

The *3696 dc-dc converters are a family of 500W modules that provide high reliability power for critical space environment applications needing higher power than full hybrid dc-dc converters can offer has been introduced by Modular Devices (MDI). The circuit topology of the *3696 provides superior SEU and 100K+ TID performance. Five different ranges of input voltage are offered, each tailored to popular satellite bus voltages. MDI Proton RadHard 100K+® technology includes: Proton resistant RF I/O Isolation: no optical devices used. Over 100kRad Si TID, 200kRad tested. And SEE/SEU Immune: LET>82MeV*cm2mg tested.

The models being introduced include: 53696 with a nominal input of 28Vdc (operating range of 20- to 40-Vdc) designed for use with 28Vdc satellite bus systems; 73696 with a nominal input of 50Vdc (operating range of 35- to 70-Vdc) designed for use with 50Vdc satellite bus systems; 83696 with a nominal input of 70Vdc (operating range of 65- to 90Vdc) designed for use with 70Vdc satellite bus systems; 93696 with a nominal input of 100Vdc (operating range of 85- to 120-Vdc) designed for use with 100Vdc satellite bus systems; and the 33696 with a nominal input of 120Vdc (operating range of 86- to 158-Vdc) designed for use with the ISS/Orion space vehicle bus.

A range of popular single- and dual-output voltages is available and custom output voltages are also available. Single-output units are offered with outputs of 12Vdc at 42A, 15Vdc at 33A and 28-Vdc at 18A. Dual-output units are offered with either ±12Vdc at 21A or ±15Vdc at 16A.

The units include an input EMI filter and active reverse polarity protection. User specified under voltage lockout is included. Outputs include high attenuation ripple and common mode spike filtering. The *3696 converters are constructed with an optimum mixture of hermetic hybrid control circuits and high reliability surface mount components, offering a construction that is suitable for the most demanding space applications, while providing reliable conduction cooled thermal paths for all components.

These dc-dc converters have an operating temperature range of -55 to +100 degrees C baseplate. Additional features include: Operating Temperature Range Inhibit Not Input: Shut operation by grounding Inh Not port; very low quiescent current (μA). Remote Sense: Auto adjusts output voltage for load lead losses. Output Adjust: User programmable to increase/decrease output voltage setpoint. Output Soft Start: User programmable output turn-on delay/ramp. Full Load Range Voltage Regulation: Regulates down to zero applied load. Dual Mode Overcurrent/Short Circuit Protection: Current mode control pulse by pulse and cyclic mode overcurrent protection. Internal Overvoltage Protection: Overvoltage protected for internal (open control loop) fault. Built-In EMI filters: Input filter for 461C CE03, output filtering smooths ripple and attenuates noise spikes.