Photovoltaic optocoupler for space satellite applications

Author: EIS Release Date: Aug 19, 2022

The CHD320’s minimum open voltage (VOC) of 10V, double that of a standard 5-volt device, means only one CHD320 is required to drive the gate of a high voltage power MOSFET.

 

The photocoupler is housed in a ceramic package with either Metal or Ceramic lid sealing, measuring just 3.85 x 3.85 x 1.6mm, making it suitable for driving the gates of high voltage power MOSFETs.

 

This can be used to develop a galvanically-isolated solid-state relay function.

 

The CHD320 is ISOCOM’s first photovoltaic coupler to feature a minimum isolation voltage (BVS) of 5.00Vrms.

The method of achieving and configuring an isolated SSR to handle high voltage, large current switching, designers generally combine a photovoltaic coupler with a MOSFET. The CHD320 has the optical elements, but not the MOSFET.

 

A typical SSR incorporates these components as the output device and are generally suitable for applications that require on/off control of electrical currents in aerospace/space equipment.

 

Typical applications include the I/O relay output for inrush current protection in PSUs, battery voltage system monitoring, ground fault detection and switching power and signal lines in instrumentation applications.

 

Manufactured in AS9100D approved facilities, the CHD320 is suitable for use in defence, aerospace and space equipment driven by high voltage DC or AC systems.