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How to do Lightning Surge protection ?

PMoha.17
Associate

Lightning surge protection level should meet the standard:

IEC61000-4-5

Common mode:2kV, normal mode:1kV

Malfunction:Level3

Destruction :Level 1

Mainly concerned on the PoE PD part and the Antenna part

3 REPLIES 3
FGUIT
ST Employee

IEC 61000-4-5 standard specifies test setup, for unshielded symmetrical interconnection line and unshielded unsymmetrical interconnection lines.

For, unshielded symmetrical interconnection line, the surge is applied on each line in parallel, through R= (number of line)*40ohm + coupling device (C=0.5µF or GTD) on each line, and the ground.

For unshielded unsymmetrical interconnection lines, the surge is applied between lines, or line to ground, through R=40ohm + coupling device (C=0.5µF or GTD).

Test setups are shown on figures 9 to 12 of IEC 61000-4-5 standard. 

Thanks for the reply..!!

Our concern is mainly on how to take care the necessary protections on the PCB to meet the above mentioned compliance

FGUIT
ST Employee

Below list of parts suitable for POE, providing several 8/20 µs surge capabilities :

  • PEP01-5841,4 TVS bidirectionnal, Vrm=58V, Ipp 8/20 µs = 24A, 4 TVS bidirectionnal, SO-8 package
  • SMA6J58CA, Vrm=58V, Ipp 8/20 µs = 32A, 1 TVS bidirectionnal, SMA package
  • SMBJ58CA, Vrm=58V, Ipp 8/20 µs = 33A, 1 TVS bidirectionnal, SMB package
  • SMCJ58CA, Vrm=58V, Ipp 8/20 µs = 83A, 1 TVS bidirectionnal, SMC package