Coilcraft C356 User Manual Download

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Planar Transformer

Prototyping Kit

Designer’s Kit C

356

®

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Summary of Contents for C356

Page 1: ...Planar Transformer Prototyping Kit Designer s Kit C356 ...

Page 2: ...art Details 2 Core 3 Primary Boards 3 Secondary Stamps 4 Auxiliary Boards 5 Pins and Insulators 7 Designing the Prototype 7 General 7 Prototype Specifics 9 Assembling the Prototype 9 Sample Transformer 10 Description 10 Assembly Procedure 11 ...

Page 3: ...ary turns Effective core area is 0 473 cm2 Complete specifications for the core are listed on page 3 Primary to secondary isolation of the production parts is 1500 Vdc For engineers who prefer to build the planar magnetics and experiment this kit is a very valuable tool Each kit contains a sufficient number of parts to build as many as six prototypes After a transformer design proves successful th...

Page 4: ...ompleted prototype consists of a windings assembly and two core halves as shown in Figure 1 The windings assembly is a combination of Primary Boards Secondary Stamps Insulator Washers and if needed an Auxiliary Board Each design requires a unique number of boards and stamps The number and orientation of the boards and stamps are dependent on the turn counts and required DCR rating An insulator was...

Page 5: ...lowing primary turns are possible 3 Turns 4 Turns 5 Turns 6 Turns 6 Turns 3 Turns 3 Turns 8 Turns 4 Turns 4 Turns 9 Turns 5 Turns 4 Turns 10 Turns 5 Turns 5 Turns 11 Turns 6 Turns 5 Turns 12 Turns 6 Turns 6 Turns Using two 6 Turn Primary Boards in parallel results in half the DCR of using one 6 Turn Primary Board When using two Primary Boards in series one board is inverted and the boards are conn...

Page 6: ...2 6Turns Primary Board equivalent to 27 AWG typical DCR 40 m 5 4 3 2 1 6 7 8 9 10 10 9 8 7 6 1 2 3 4 5 6T Layer 1 Layer 2 SecondaryStamps Each Secondary Stamp is one turn Stamps can be combined in series up to a total of four turns The stamps can also be connected in parallel for lower DCR Stamp 1 and Stamp 2 are identical electrically Use the stamps that provide the pin connections suitable for y...

Page 7: ...iary Boards The Auxiliary Boards are suitable for most applications without the need to make combinations The six auxiliary boards in the kit are 2 Turns 3 Turns 4 Turns 5 Turns 7 Turns 9 Turns Each Auxiliary Board is marked with the number of turns on layer 2 The Auxiliary Board should be positioned at the top or bottom of the windings assembly 2Turns Auxiliary Board typical DCR 16 m 5 4 3 2 1 6 ...

Page 8: ...y Board typical DCR 82 m 5 4 3 2 1 6 7 8 9 10 10 9 8 7 6 1 2 3 4 5 4T Layer 1 Layer 2 5Turns Auxiliary Board typical DCR 140 m 5 4 3 2 1 6 7 8 9 10 10 9 8 7 6 1 2 3 4 5 5T Layer 1 Layer 2 7Turns Auxiliary Board typical DCR 165 m 5 4 3 2 1 6 7 8 9 10 10 9 8 7 6 1 2 3 4 5 7T Layer 1 Layer 2 Doc355 pmd 5 19 2008 3 58 PM 6 ...

Page 9: ...meter are used for pins 6 10 and connect all the secondary stamps Small pin Large pin Insulator DesigningthePrototype General There are many combinations of boards and stamps that may be used in a design The total number of parts that can be used in a windings assembly is limited by the core size The cores can accommodate a windings assembly up to 5 mm high including top and bottom insulators Maxi...

Page 10: ...onnects to pins 1 and 5 A typical schematic showing pin connections is shown in Figure 2 A typical dimensional drawing and recommended land pattern is show in Figure 3 9 2 3 Pri Aux 7 4 1 5 8 Sec Figure 2 Typical Schematic Land pattern shown is for all pins being used If pins are not used in the transformer omit pads from the pattern 0 800 20 32 Recommended Land Pattern 0 125 3 18 0 095 2 41 0 095...

Page 11: ... If the DCR of the primary is higher than desired double the number of Primary Boards and connect them in parallel If the DCR of the secondary is higher than desired double the number of stamps Keep in mind the maximum number of parts that can fit in the core Primary turns ________ Required DCR ________ Secondary turns ________ Required DCR ________ Auxiliary turns ________ Current handling ______...

Page 12: ...ore an internal short can occur Note The winding assembly of the sample transformer is intentionally not glued to the core This allows the winding assembly to be removed from the core to be studied Study the exploded view of the sample transformer and plan the order and orientation of parts used in the prototype Lay out all the parts in the correct order and orientation Review the assembly procedu...

Page 13: ...e that the centers of all parts are concentric 2 Glue an insulator into the core 3 Orient a Stamp 1 so that the terminals extend out of the core as shown in the detail in Figure 5 Make sure the terminal holes will align with pins 7 and 8 of the Primary Board 4 Place the stamp over the insulator 5 Working from the bottom insert two Large Pins pins 7 and 8 into Stamp 1 Note The bottom of the pins mu...

Page 14: ...d onto the insulator Solder the stamp to pins 8 and 9 16 Place an insulator over the stamp 17 Position a 6 Turns Primary Board so that Layer 2 faces up Align terminals 2 3 and 4 with the small pins and terminals 7 8 and 9 with the large pins Slide the board down over the pins onto the insulator 18 Solder the board to all six pins 19 Place an insulator over the board 20 Invert a Stamp 1 and slide i...

Page 15: ... 1 inverted one half of second turn Stamp 1 inverted one half of second turn Stamp 1 one half of first turn Stamp 1 one half of first turn 6 Turn Primary Board 6 Turn Primary Board inverted Core half 6 T Orientation of first Stamp 1 and bottom Core half Insulator Insulator Insulator Insulator Insulator Insulator Insulator Doc355 pmd 5 19 2008 3 58 PM 13 ...

Page 16: ...Silver Lake Road Cary IL 60013 USA 1 847 639 6400 Fax 1 847 639 1469 info coilcraft com European Headquarters 21 Napier Place Wardpark North Cumbernauld Scotland G68 0LL 44 1236 730595 Fax 44 1236 730627 sales coilcraft europe com Doc355 pmd 5 19 2008 3 58 PM 14 ...

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