Radiation-Hardened 16-Channel Current Driver with Integrated Decoder for Satellite Applications

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ByAbhiemanyu Pandit 0

Radiation-Hardened 16-Channel Current Driver with Integrated Decoder for Satellite Applications

 

Renesas Electronics Corporation launched new radiation-hardened 16-channel current driver with integrated 4-bit decoder for reducing the size, weight and power (SWaP) of satellite command and telemetry systems. The ISL72814SEH integrates the decoder, input level shifter, and 16 current driver arrays in a single monolithic IC which allows satellite manufacturers to significantly increase system capacity and cut solution footprint by 50 percent for their medium Earth orbit (MEO), highly elliptical orbit (HEO), geosynchronous Earth orbit (GEO), and deep space mission profiles.

 

The ISL72814SEH features twice the channel count and 54 percent less VCE(SAT) power dissipation on each channel compared to competitive drivers. It also features integrated level shifter which removes several peripheral components. The internal clamp diodes of the ISL72814SEH eliminate the need for additional protection circuitry when driving inductive loads. Using multiple ISL72814SEH current drivers, it is possible to send 28V/500mA pulses for 750ms to the more than 1,500 RF switches in a communication satellite’s payload, routing RF signals to the designated Internet radio stations and television channels. 12V-30V with 50mA-600mA latching pulses are also possible to send, that control the relays and solenoids that turn on/off the propulsion system thrusters, change orbital altitude, and turn on the motor to tilt the solar panels.

 

The ISL72814SEH provide single-event effects (SEE) robustness in heavy ion environments with the help of Renesas’s proprietary silicon on insulator process. Also, the ISL72814SEH can generate pulses of up to 42V and 700mA with the help of integrated 16-channels of common-collector open-emitter PNP driver outputs. The device comes with wafer acceptance tested to 100krad(Si) over high dose rate (HDR), and 75krad(Si) over low dose rate (LDR) total dose testing. The ISL72814SEH comes with completed characterization testing with no single event latch-up (SEL), single event burnout (SEB), and single event transients (SETs) at a linear energy transfer (LET) of up to 86MeV*cm2/mg.

 

Key Features of ISL72814SEH 16-Channel Driver Circuit: 

  • Integrated 4-bit to 16-channel decoder and input level shifter
  • High current outputs up to 700mA
  • High voltage outputs up to 42V
  • VCC supply range of 3V to 13.2V
  • Ultra-low VCE saturation of 1.35V at 500mA
  • Extended operating temperature range of -55°C to +125°C

 

To create a satellite command and telemetry signal processing solution with superior rad-hard performance, the ISL72814SEH can be combined with the following ICs: ISL71590SEH temperature sensor, ISL70591SEH precision current source, ISL71840SEH 30V 16-channel multiplexer, ISL70517SEH 36V differential input in-amp, ISL70419SEH precision op amp, ISL71090SEH12 precision voltage reference, and ISL72026BSEH CAN transceiver.

 

The Renesas has confirmed that the ISL72814SEH radiation-hardened 16-channel current driver is available now in a 28-lead ceramic flatpack package. Also, an evaluation board to evaluate device features and performance is available from Renesas.

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