AN4647 Datasheet, PDF (1/9 Pages) STMicroelectronics – Circuit breaker with transient voltage suppression based

AN4647
Application note
Circuit breaker with transient voltage suppression based on the
CBTVS2Axx-1F3: input capacitor sizing of portable equipment
Mathieu ROUVIERE
Introduction
The CBTVS2A12-1F3 / CBTVS2A16-F3 (CBTVSAxx-1F3) is a single line diode TVS
integrating a non-resettable fuse designed specifically for the protection of integrated
circuits in portable equipment and miniaturized electronics devices subject to ESD, OVP
and OCP.
Inrush current, resulting from portable equipment plugin and input capacitor charging, can
be higher than fuse current itself. The non-resettable fuse functional reliability must then be
validated.
This document presents:
• Inrush current examples with typical application case for Vbus charging
• Higher voltages with high value charger capacitance are also tested.
Severe conditions (ambient temperature, number of inrush surges) are applied to validate
fuse robustness and to determine the highest portable equipment input capacitor.
February 2015
DocID027372 Rev 1
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