Four independent and isolated rad hard MOSFETS into a single package

Citation

(2000), "Four independent and isolated rad hard MOSFETS into a single package", Aircraft Engineering and Aerospace Technology, Vol. 72 No. 6. https://doi.org/10.1108/aeat.2000.12772fad.008

Four independent and isolated rad hard MOSFETS into a single package

Four independent and isolated rad hard MOSFETS into a single package

Keywords: Intersil, Satellites, Power supply, Radioactive environments

Designers of satellite power supply management and power switching applications can now reportedly implement multiple radiation hardened (rad hard) MOSFETs in a single package. Intersil's FSR 1110 device is described as a quad 100-volt, 680 milliohm (mohm) MOSFET, that is said to be rated to a total radiation dose capability of 100,000 RADS.

Intersil's FSRI 1110 is the latest addition to the FS family of rad hard MOSFETs that delivers Single Event Effects (SEE) protection. The FSRI 1110 offers designers the use of four independent and isolated devices in a single package. Compared to the implementation of four discrete devices, the single package option utilises less board space and contributes to a lighter weight design. The FSR 1110 package and silicon solution features low rds(on) and gate charge minimising both conduction and switching loss in satellite power systems.

"The FSR1110 MOSFET is another addition to our rad hard power management solutions", said Jerry Kim, space and defence power marketing manager at Intersil. "This device is unique to the industry in that it conserves board space and is also fully rated for single event effects. It provides the high level of integration and radiation hardness that satellite power systems demand".

Intersil developed its FS Series of rad hard MOSFETs specifically for military and space applications. The devices feature immunity to SEE and Single Event Gate Rupture (SEGR) and are rated to 100,000 RADS of total dose hardness. The portfolio includes N-Channel and P-Channel devices, in a variety of voltage, current and on-resistance ratings.

The FSRI 1110 is immediately available in a 14-lead DIL package.

Intersil Corporation also announces a new Star*Power radiation hardened, high-speed pulse width modulator (PWM) IC, especially designed for space and aerospace power systems, including communications satellites exposed to harsh radiation environments. Featuring dual outputs, the new rad hard HS-1825ARH PWM is believed to be ideal for controlling power MOSFET drivers or directly driving rad hard power MOSFETS in power supplies, DC to DC converters and motor control applications.

This latest addition to Intersil's Star*Power family of rad hard power semiconductors provides a fully Pad Hard version of the industry standard 1825A dual output PWM used in high frequency switched-mode power supplies. It is stated to be fully tested and guaranteed to perform industry standard 1825A PWM functions to high dose radiation levels of 300K RADS, and reportedly does not require any additional upscreening or rad testing by the designer. The device can be used in either current-mode or voltage-mode and is designed for single-ended boost converter applications.

The device monitors the output voltage of the supply and adjusts the switching pulse widths to maintain the desired voltage levels. Latch up immune, the HS-1825ARH is also said to provide greatly reduced sensitivity to low dose rate effects.

Since all the HS-1825ARH parameters are reported to be tested and guaranteed to 300K RAD over the full military temperature range, customers know exactly how the device will perform in extreme conditions. The device operates from a single supply from 12V to 20V and requires only a minimal 100 microamps of current. Peak output current is at IA typical. This device also features an undervoltage (<10 volts) lockout capability. A programmable soft-start feature is thought to ensure that the power is fully regulated before the output pulses are maximised. This feature allows for small duty cycles at power up and prevents initial voltage overshoot.

Details available from Intersil Literature Service. Tel: +44 (0)1344 350250; Fax: +44 (0)1344 488045; E-mail: Intersilinfo@mktpoint.com