etaldoc 857/2 page 1 of 4 august 2004 product data sheet planar power transformer p6142 features applications ? planar windings ? dc-dc converters ? 4mm height above pcb ? flyback converters ? low leakage inductance ? 24v or 12v systems ? high frequency operation ? 15v @ 1a output ? externally configurable ? 5v @ 3a output ? 10?32v input capability ? auxiliary winding ? lead-free (pb-free) description p6142 is a planar power transformer using multilayer pcb technology. it is intended for low profile high frequency discontinuous flyback dc-dc converters up to 500khz. with careful design, output power exceeding 20w is achievable. p6142 has split primaries that can be configured in series or parallel for nominal 24v and 12v systems respectively, with nominal 15v output. the recommended input voltage range is 10v to 32v. additionally, an auxiliary winding is provided on the primary side. the contacts to the host circuit board are made by solder connection to large plated-through holes in the p6142 pcb, thus ensuring low resistance connection. the ferrite is intended to sit within a pcb cut-out, giving a height above board of 4mm. p6142 is lead-free (pb-free) and suitable for conventional and lead-free processing.
p6142 etaldoc 857/2 page 2 of 4 august 2004 specifications electrical typical values at t = 25oc, unless otherwise stated. parameter conditions min typ max units primary inductance 100khz, 100mv each primary winding 3-8, 4-7 p6142-1 0.9 1.0 1.1 h p6142-2 1.11 1.26 1.41 h leakage inductance 500khz, 100mv (3, 4)-(7, 8); link 1, 2, 9, 10; link 5, 6 - - 100 nh primary/secondary voltage isolation (3+4+5):2 500 - - vrms interwinding capacitance 100khz, 1v - 325 - pf total transformer losses vout = 5v at iout = 3a 400khz - 0.6 - w dcr primaries 3-8, 4-7 5 7 9 m ? auxiliary 53 70 87 m ? secondary: each section 2-1, 1-10, 10-9 3.4 4.5 5.6 m ? turns ratio (3-8):(4-7) (3-8):(5-6) (3-8):(9-2) (9-10):(10-1) (9-10):(1-2) - - - - - 1.0 0.67 0.67 1.0 1.0 - - - - - - - - - - operating range: functional storage ambient temperature -40 -40 - - +85 +85 oc oc typical magnetic core coefficients c 1 core factor 0.514mm -1 v e effective volume 800mm 3 l e effective length 20.3mm a e effective area 39.5mm 2 e effective permeability 123 (p6142-1) 154 (p6142-2) m mass 4.1g 9 2 3 8 4 7 t ra nsfo rmer sc hema tic fig 1 5 6 1 10 prim ary 2 t prim ary 2 t auxiliary 3t 1t 1t 1t sec o n d a ry
p6142 etaldoc 857/2 page 3 of 4 august 2004 application schematics in the flyback converter topology, the transformer operates as an energy storage element, and the ferrite core of p6142 is gapped to avoid saturation. the variants p6142-1 and p6142-2 differ in their gap sizes to suit particular applications and switching frequencies. p6142-2 is recommended for frequencies from 100khz to 350khz; p6142-1 is recommended for frequencies from 350khz to 500khz note that in the discontinuous conduction flyback mode, the output load current flows when the switch is open. observe winding polarities. the auxiliary winding may be used to provide a power rail for switching and control circuits. in the schematics below, switch drive circuitry and feedback components are omitted for simplicity. 24v operation (22?32v) for 24v operation the transformer primaries are connected in series, giving nominal primary inductance of 4h (p6142-1) and 5h (p6142-2), and primary dcr of 14m ? . fig 2 shows a typical schematic with a 15v @ 1a output. for a 5v output, use the output tap as shown in fig 3. 12v operation (10?22v) for 12v operation the transformer primaries are connected in parallel, giving nominal primary inductance of 1h (p6142-1) and 1.26h (p6142-2), and primary dcr of 3.5m ? . fig 3 shows a typical schematic with a 5v @ 3a output. for a 15v output, use the output tap as shown in fig 2. multiple output following the examples given in figs 2 and 3, the secondary taps can be utilized to provide multiple output voltages. for example, fig 4 shows a 24v input flyback converter with +10v and 5v outputs. other combinations are possible. 22-32v swi t ch 9 2 3 8 4 7 15v + ? + ? 24v operation fig 2 1a for 5v output see fig 3 10-22v swi t ch 9 3 8 4 7 5v + ? + ? 12v operation fig 3 3a for 15v output see fig 2 10 24v swi t ch 9 2 3 8 4 7 +5v + ? multiple output fig 4 1 10 0v -5v 0v +10v
p6142 etaldoc 857/2 page 4 of 4 august 2004 construction dimensions shown are in millimetres. terminal finish is 0.1m max gold (au) over nickel (ni). ordering code absolute maximum ratings p6142- t (ratings of components independent of circuit). short term isolation voltage (1s) 500vrms peak primary current (per primary winding) 12a p6142-1 10a p6142-2 v.s per primary winding 11v.s (for b=135mt) storage temperature +85oc magnetic core temperature 120oc tape and reel (400 parts per 13? reel) gap variant: 1= 1.0h (nominal), frequency 350?500khz 2= 1.26h (nominal), frequency 100?350khz type code reflow temperature (10s) 260oc etal group oy, kuormatie 14, fin-03101, nummela telephone: +358 (0)20 7500 330 fax: +358 (0)20 7500 333 website: www.etalgroup.com email: etalgroup@egruppen.com fm 25326 iso 9001 19.2 11.7 7.0 9.8 7.0 9.8 12.0 4.2 4.2 7.9 7.9 r 1 . 2 0 cu pads 2.0 x 2.4 (10x) pc b c u t o u t recommended pcb layout (t op view) connections fig 6 dimensions fig 5 25.0 9.8 7.7 18.0 6.0 12.0 2.1 10.0 core pi n 1 i d e n t mounting pads: plated through holes ?1.5 12 3 4 7 5 6 8 9 10 cyymm p6142 - x
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