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6 Q. T! s3 P* L' f! o' }6 f | PCB layer transformers2 R* d* t7 _& ~% d4 x
| General/ n6 I1 l5 e; C2 c
| 60601-1(ed.2);am1;am21 F4 P3 M0 a/ G0 ^9 j; M( q
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5 y& r" }) M4 N# w7 z6 }- fStandard(s)- (year and edition):' d/ X5 I( G6 q2 A" ^: S
IEC 60601-1:1988 Ed.2
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7 v% p+ z# d( \2 J% C) KSub clause(s):
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Sheet n°: 537: l8 K( X6 f6 d
Subject:/ y+ j, Q5 i" ^' _; ?
PCB layer transformers,
6 { o( H9 f7 e/ L% Q" AKey words:
7 K+ E9 p( r" N; {% APCB layer transformers
6 z; K1 Q( t- \3 ~Decision taken at the 40th% g; m- O2 a3 M7 W! U V, v
meeting 20036 J) V- n K; E, L9 S% `
Question:
' I% I& h$ `2 _# }What requirements are needed for PCB layer transformers using etched windings?; c! ^. \2 y: e" a; Z0 W
Decision:) `( C- f9 n# C& X4 d
The requirements of the IEC 60601:1988 Ed.2 should be used with regard to creepage distances and2 Y0 ^+ A( Y1 j
isolation distances through thickness.; T4 L, L) t: n/ A! k0 T
Explanatory notes:( w: k, o$ H9 o5 L* L
This issue will be put forward to TC 66 and TC62 to deal with this specific problem. In the meantime a* v K% | o7 U4 r+ u J A9 e1 c
temperature cycling test according to IEC 60950 can be used for reference. Base for this test are the
' V% z4 ~8 d1 y8 s: U$ rtemperatures retrieved during normal condition tests calculated/adjusted to an ambient of 40 °C. It is
+ u0 e3 {: O$ t. s' Z% @: }7 eimportant that the influence of the temperature of other components shall be taken into consideration.
4 H1 D- |- Y+ P6 t$ q5 J' `& O) iThe minimum thickness through insulation can be taken as from IEC 60950, being 0,4 mm.
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