Rad-hard driver has integrated decoder to reduce satellite system size

Claimed to reduce the size, weight and power (SWaP) of satellite command and telemetry systems, the ISL72813SEH is a radiation-hardened (rad-hard) 32-channel driver with integrated decoder from Intersil.

According to the company, it is the industry’s first high current driver to integrate the decoder, level shifter and driver array in a single monolithic IC. It allows satellite manufacturers to increase system capacity and reduce size by up to 50 per cent. The device offers a higher density channel count, by a factor of four, compared to the nearest competitor, says the company, while the integrated level shifter eliminates several peripheral components.

The ISL72813SEH driver leverages the company’s proprietary silicon on insulator process, which provides single-event latch-up (SEL) robustness in heavy ion environments. The integrated decoder interfaces directly to the GPIOs of FPGAs and CPUs in the satellite’s flight computer, to reduce pin count compared to competitive one-input to one-output driver arrays. Each of the device’s 32-channels of common-emitter open-collector driver outputs can generate pulses of up to 42V and 600mA.

The ISL72813SEH addresses latching relay and solenoid commanding for most satellite control functions, including redundancy management, mechanism drive enables, propulsion component relays and enables, battery management, and payload switch control. The low VCE saturation levels eliminate the concern of reducing the overhead voltage required to drive the load. The driver’s power efficiency and high integration reduces the amount of circuitry required on the bus, allowing customers to add more spacecraft functionality and processing power.

The driver operates in the extended operating range of -55 to +125 degree C. It is available now in a 44-lead ceramic lead-less chip carrier (CLCC) package. An evaluation board is also available.


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