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Gapped Planars

  • Thread starter Holloway,Graham \(UK\)
  • Start date
H

Holloway,Graham \(UK\)

Jan 1, 1970
0
A supplier of PSU's has designed one for us that has 14 layers of windings.
Each layer is 2oz/70uM copper. The primary is 3 turns on each of the central
6 layers, all in parallel and the secondary is 1 turn on each of the 8 outer
layers, again all in parallel. The mode is discontinuous flyback and the
cores have a stepped gap between 2 E cores. This places the gap in the
centre of the windings.
This form of construction appears to go against at least one rule set by
Unitrode. Have any designers out there got any thoughts about this?
 
L

legg

Jan 1, 1970
0
A supplier of PSU's has designed one for us that has 14 layers of windings.
Each layer is 2oz/70uM copper. The primary is 3 turns on each of the central
6 layers, all in parallel and the secondary is 1 turn on each of the 8 outer
layers, again all in parallel. The mode is discontinuous flyback and the
cores have a stepped gap between 2 E cores. This places the gap in the
centre of the windings.
This form of construction appears to go against at least one rule set by
Unitrode. Have any designers out there got any thoughts about this?
Don't recall Unitrode publishing design rules for low voltage planar
flybacks.

Is it interleaving that concerns you? Are you sure you understand and
are accurately describing the topology? Have you querried the
designer? I'm sure he'd be interested.

RL
 
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