P6140

PRODUCT DATA SHEET PLANAR POWER TRANSFORMER Features ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ Planar windings 4mm height above PCB Low leakage inductance High frequency operation Externally configurable 18–70V input capability Auxiliary winding Lead-free (Pb-free) P6140 Applications ∗ ∗ ∗ ∗ ∗ DC-DC converters Flyback converters 48V or 24V systems 15V @ 1A output 5V @ 3A output DESCRIPTION P6140 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. P6140 has split primaries that can be configured in series or parallel for nominal 48V and 24V systems respectively, with nominal 15V output. The recommended input voltage range is 18V to 70V. 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 P6140 PCB, thus ensuring low resistance connection. The ferrite is intended to sit within a PCB cut-out, giving a height above board of 4mm. P6140 is lead-free (Pb-free) and suitable for conventional and lead-free processing. ETALDOC 855/2 Page 1 of 4 August 2004 P6140 SPECIFICATIONS Electrical Typical values at T = 25ºC, unless otherwise stated. Parameter Primary Inductance Conditions 100kHz, 100mV Each primary winding 3-8, 4-7 P6140-1 P6140-2 Leakage Inductance 500kHz, 100mV (3, 4)-(7, 8); link 1, 2, 9, 10; link 5, 6 (3+4+5):2 100kHz, 1V Vout = 15V at Iout = 1A 400kHz Primaries 3-8, 4-7 Auxiliary Secondary: each section 2-1, 1-10, 10-9 Turns Ratio (3-8):(4-7) (3-8):(5-6) (3-8):(9-2) (9-10):(10-1) (9-10):(1-2) Ambient temperature -40 -40 +85 +85 ºC ºC 2.0 2.4 2.25 2.8 2.50 3.25 100 µH µH nH Min Typ Max Units Primary/Secondary voltage isolation Interwinding capacitance Total transformer losses DCR 500 12 53 3.4 325 0.6 16 70 4.5 20 87 5.6 Vrms pF W mΩ mΩ mΩ - 1.0 1.0 1.0 1.0 1.0 - - Operating range: Functional Storage Typical Magnetic Core Coefficients C1 Ve le Ae µe m Core factor Effective volume Effective length Effective area Effective permeability Mass 0.514mm 800mm 20.3mm 3 -1 T ransformer sc hematic Fig 1 PRIMARY 3 3T 8 4 PRIMARY 3T 1T 7 5 AUXILIARY 3T 6 9 1T 1 1T 10 SECONDARY 2 39.5mm 123 (P6140-1) 154 (P6140-2) 4.1g 2 ETALDOC 855/2 Page 2 of 4 August 2004 P6140 APPLICATION SCHEMATICS In the flyback converter topology, the transformer operates as an energy storage element, and the ferrite core of P6140 is gapped to avoid saturation. The variants P6140-1 and P6140-2 differ in their gap sizes to suit particular applications and switching frequencies. P6140-1 is recommended for frequencies from 100kHz to 350kHz; P6140-2 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. 48V operation (38–70V) For 48V operation the transformer primaries are connected in series, giving nominal primary inductance of 9µH (P6140-1) and 11.3µH (P6140-2), and primary DCR of 33mΩ. Fig 2 shows a typical schematic with a 15V @ 1A output. For a 5V output, use the output tap as shown in fig 3. 48V Operation Fig 2 3 2 1A 8 + 15V + 38-70V – 4 – 9 For 5V output see fig 3 7 SWIT CH 24V operation (18–38V) For 24V operation the transformer primaries are connected in parallel, giving nominal primary inductance of 2.25µH (P6140-1) and 2.84µH (P6140-2), and primary DCR of 8mΩ. Fig 3 shows a typical schematic with a 5V @ 3A output. For a 15V output, use the output tap as shown in fig 2. 24V Operation Fig 3 3 3A 8 + 10 5V + 18-38V – 4 – 7 SWIT CH 9 For 15V outp ut see 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 48V input flyback converter with +10V and ±5V outputs. Other combinations are possible. Multiple output Fig 4 3 2 + 10V 8 1 10 0V + 5V + 48V – 4 0V 7 SWIT CH 9 -5V ETALDOC 855/2 Page 3 of 4 August 2004 P6140 CONSTRUCTION Dimensions Fig 5 12.0 10 9 8 7 6 25.0 Connections Fig 6 12.0 9.8 7.0 9.8 4.2 R1 . 20 P6140 - X 7.0 CYYMM 18.0 7.7 5 3 4 Pin 1 ident 2.1 10.0 11.7 Cu P ADS 2.0 x 2.4 (10x) Dimensions shown are in millimetres. Terminal finish is 0.1µm max gold (Au) over nickel (Ni). ORDERING CODE P6140- T Tape and Reel (400 parts per 13” reel) Gap variant: 1= 2.25µH (nominal), frequency 100—350kHz 2= 2.84µH (nominal), frequency 350—500kHz Type code 6.0 RECOMMENDED PCB LAYOUT (T VIEW) OP ABSOLUTE MAXIMUM RATINGS (Ratings of components independent of circuit). Short term isolation voltage (1s) Peak primary Current 500Vrms 8A (primaries in series) 16A (primaries in parallel; 8A per primary winding) V.µs per primary winding Storage temperature Magnetic Core temperature Reflow temperature (10s) 24V.µs (for B=200mT) +85ºC 120ºC 260ºC 4.2 CORE Mounting pads: plated through holes ø1.5 7.9 12 9.8 19.2 PCB c utout 7.9 ISO 9001 FM 25326 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 ETALDOC 855/2 Page 4 of 4 August 2004