$ f( \. h9 z% H& r! m5 w$ P9 f9 W$ aStandard(s)- (year and edition): - r+ B( Q! m4 Y5 zIEC 60601-1:1988 Ed.2 ) j8 F/ D. _! J- ~7 ^Am1+Am2 8 d' t% d5 @) N1 P* RSub clause(s):. k+ h) P, ^, |( D4 b( v3 V
General & Y: F A( f! y+ ]Sheet n°: 537 ; J* I1 I. S9 b. C2 Z b2 ~+ x* NSubject:2 R- _% |+ L6 D' |$ s) r9 \
PCB layer transformers, {- M4 w+ }6 l
Key words:; {. |: F# Z+ j0 R
PCB layer transformers - | U ?# k% p& M+ { A" bDecision taken at the 40th, \: b6 J7 c4 h3 g7 T; Z- c
meeting 20034 q& y a' H3 @- V4 D b% @% D
Question: % u7 _' A/ F% ?3 l/ b* U: \What requirements are needed for PCB layer transformers using etched windings? O. S0 @) @0 BDecision: ! v# v+ f! e2 g" P4 b6 k* B9 UThe requirements of the IEC 60601:1988 Ed.2 should be used with regard to creepage distances and' q5 ^; q* L) z$ a8 }0 L; ?
isolation distances through thickness. ' _( j* ~2 j) K: K( G2 AExplanatory notes:8 ~( `4 s( X: }+ e* @
This issue will be put forward to TC 66 and TC62 to deal with this specific problem. In the meantime a 5 X# R, G& G P {temperature cycling test according to IEC 60950 can be used for reference. Base for this test are the7 q! @. ]9 p# m! W
temperatures retrieved during normal condition tests calculated/adjusted to an ambient of 40 °C. It is 2 C: u$ @9 Y' B4 x+ I* Himportant that the influence of the temperature of other components shall be taken into consideration.7 l" T, N/ h. L; e9 N: h, o
The minimum thickness through insulation can be taken as from IEC 60950, being 0,4 mm. 5 o* V% R& [9 p1 ^, O5 p) Z; X9 x3 |. X$ z' e" }7 J
[attach]76257[/attach]7 F: T$ F3 L3 }9 ?+ e( |
