Application Note Three Phase Bridge DBI25-18A Ensuring the Requirements of EN61000-4-5 at Industrial Mains Three Phase Bridge DBI25-18A Ensuring the Requirements of EN61000-4-5 at Industrial Mains Industrial mains can have 600VRMS and even more (1). That requires the usage of 2x 320VRMS varistors for input voltage surge protection, to fulfill the requirtements of EN61000-4-5. Such varistors have a clamping voltage of typically 2x 840V = 1680V, making the industry standard 1600V input bridges working at or even over the limit (2). This design gap can be managed by using the next generation three phase bridge DBI25-18A by Diotec. Its 1800V VRRM provides a comfortable safety margin, allowing for reliable operation of industrial power supplies and frequency inverters (3). 2 2x 840 VC = 1680 V ! (2x 320 VRMS ) Rt 1 575…600 VRMS L1 L2 L3 CL DBI25-18A 1600 VRRM 3 1800 VRRM √ Features of the DBI25 series ✔ ✔ ✔ ✔ ✔ ✔ ✔ VRRM from 800V to 1800V IFAV = 25A at TC = 115°C (Heatsink Assembly) IFAV = 4A at TA = 50°C (Free-Standing) Solderable Leads for Direct PCB Assembly Only One Screw required for Heatsink Assembly Case Fully Isolated (Viso = 2500V~) Sufficient Clearance and Creepage >4mm! DBI25-18A DBI25-xxA series: Pin Outline – ~~~ + DBI20-16B DBI20-xxB series: Pin Outline + ~~~ – (20A, 800...1600V) For detailed data sheets, type the part number into the “Search” field on http://www.diotec.com/ © Diotec Semiconductor AG 1/1 2016-05-04