Abstract

Telecommunication systems operate on -48V rail and under harsh environmental conditions. The need for continuous connectivity puts challenging requirements on these systems to avoid system resets during transient events defined in the ATIS-0600315.2018 telecom standard. In particular, the hot-swap protection circuit at the front end needs to handle the transient events reliably. As the system power level increases, the traditional hot-swap circuit becomes complex and bulkier, increasing the system cost. This application note introduces an output voltage clamping design using the industry’s advanced featured negative hot-swap controller TPS23521.