Power

How high-voltage isolation technology works

11th December 2018
Alex Lynn
0

This video is part of a series of videos on high-voltage reinforced isolation quality and reliability from Texas Instruments. The video is on the high-voltage isolation structure itself. Reinforced isolation technology at Texas Instruments is realised by using thick silicon dioxide capacitors combined in series. Each channel uses high-voltage isolation capacitors on both die. 

As you can see in the schematic cross-section in the upper left of the video, where there is a die on the left side and a die on the right side, and each of them have a high-voltage capacitor. And they're connected in series. The combined isolation capacitor thickness is greater than 21 microns.

Data is transmitted across the isolation barrier, as shown in the schematic on the upper right. Signal comes in, is modulated, goes across the barrier as part of a differential pair of capacitors, demodulated, and out. This same isolation communication path is used for digital isolators, for isolated links, for A to D converters, isolated amplifiers, and isolated gate drivers. The result of this structure is a very high isolation capability, 12.8kV surge voltage rating, 8kVpeak transient over-voltage, and 1.5 kVrms working voltage.

To watch the video, click here.

Product Spotlight

Upcoming Events

View all events
Newsletter
Latest global electronics news
© Copyright 2024 Electronic Specifier