Radiation tolerant eight channel source driver has space qualifications
This means the AAHS298B meets the required qualifications for space programmes as DLA validates the quality assurance and reliability of the device. It is offered in two package types with various screening options.
“Successfully achieving these qualifications is vital to securing design-ins in satellite programs requiring the highest quality and reliability performance,” said Dorian Johnson, Microsemi’s high-reliability product marketing manager. “Obtaining QML status not only demonstrates Microsemi’s continued commitment to supplying integrated space solutions, but gives our customers the added assurance that our radiation-tolerant AAHS298B source driver can meet the demanding requirements of the DLA while offering the ability to use the device in conjunction with our LX7730 telemetry controller, LX7720 motor controller and LX7710 diode array devices.”
The AAHS298B source driver provides an interface between spacecraft bus electronics and other subsystems, with the highest output source current for space applications requiring radiation tolerance. Command signal outputs from the spacecraft’s digital control electronics are typically TTL (5-volt) (V), CMOS (3V) and high-level (12V) logic and are not directly compatible with users’ command input requirements. These user requirements occur in payload, power, thermal and housekeeping subsystems and range between 14V and 45V. The AAHS298B is an interface between these systems, providing a continuous 700 mA current to switched high side-drivers on the output.
It is aimed at applications such as command and data handling power subsystems, spacecraft control electronics attitude control, relay/solenoid drivers, as well as stepper and/or servo motor drivers. Internal thermal shutdown to protect against over-current and soft-start occurrences and it operates from 55ºC to +125ºC. It is also radiation tolerant to 100kRad (Si) total dose, with 50kRad (Si) enhanced low dose radiation sensitivity (ELDRS).
The integration of eight non-inverting high side channels gives satellite designers reduced weight, resulting in smaller board space, and higher reliability as compared to discrete implementations. As many satellite manufacturers and projects require the DLA QML certifications and listings as assurance the product meets Military Performance Specification (MIL-PRF) requirements, the AAHS298B meets these standards as part of the company’s growing portfolio of mixed signal integrated circuits (ICs) for demanding space applications. The QML qualification also allows designers across the entire range of designs, from low cost commercial and scientific applications to human rated and government systems, to use the parts without part selection justifications or source control drawings.
“Increasing requirements for higher output currents combined with demands for weight and board space reductions were compelling reasons to initially investigate Microsemi’s AAHS298B source driver for our designs,” said Glenn Lommasson, vice president of Design & Development Engineering Services (DDES). “In addition, the presence of the internal clamp diode in the driver output allowed a much more efficient method for implementing transient protection during inductive kickback events, which reduced the number of clamp diodes needed in other solutions. The recent device qualification and SMD listing as a QML-V device was also a very important element for us to baseline this part as more programs are mandating Technical Operating Report (TOR) guidelines for parts quality, DLA certification and radiation assurance.”
Over 300 satellites with a launch mass over 50 kilograms will be launched on average each year by 2026 for government agencies and commercial organizations worldwide. This represents a market of $30bn a year, a 25 percent increase over the past decade.
The AAHS298B source driver is available in production quantities in a 20pin ceramic small outline integrated circuit (SOIC) with formed and flat leads and is listed under SMD 5962-15231 with the DLA.
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