Definition: Isolators with functional isolation protect and pass signals between two components that have a large ground potential difference.
Listed below are some differences between Functional, Basic, and Reinforced Isolation.
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|
Functional Isolation |
Basic Isolation |
Reinforced Isolation |
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Definition |
Isolation required to support proper function of the equipment |
Isolation of hazardous-live-parts which provides basic protection |
Isolation of hazard-live parts which provides a degree of protection against electric shock equivalent to double insulation |
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Typical application examples |
Infotainment, Power Delivery, Test and Measurement |
Traction Inverter |
EV Charging Station |
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Creepage |
>2.2mm |
>4mm |
>8mm |
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Example Devices |
ISO65xx |
ISO67xxB ISO77xxB ISO78xxB |
ISO67xx ISO77xx ISO78xx |
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Packages |
REU |
D, DBQ, DW |
DW, DWV, DWW |
Shown below is the package comparison between functional, basic, and reinforced isolation. The image is to scale and is shown below:
TI Functional isolators are available in REU package size and use less space on the PCB. The area of the REU package (6mm^2) is 80% less area than the D package (29.5mm^2). Since the REU package is a leadless package, less board space is used and can allow for more compact designs.
