POWER TRANSFORMER Flyback Transformer for PoE E & E Magnetic Products Limited Providing Power to PoE devices with up to 6 Watts SCHEMATICS Flyback transformers designed for PoE (IEEE802.3af) powered devices with up to 6 Watts Designed for 250kHz switching frequency with input of 36 - 72V Low Leakage Inductance Hipot voltage: 1500Vrms Operating temperature -40C to +125C. RoHS compliant version is available Custom design is also available ELECTRICAL SPECIFICATION @ 25C Part Number RoHS Part Number Pri : Sec Pri : Bias Inductance at 0A (uH 10%) 835-00830 835-00830F 1 : 0.07 1 : 0.36 75 67.5 835-00831 835-00831F 1 : 0.08 1 : 0.33 55 835-00832 835-00832F 1 : 0.11 1 : 0.36 835-00833 835-00833F 1 : 0.15 835-00834 835-00834F 1 : 0.35 Turns Ratio Inductance Leakage at Ipk Inductance (uH Min) (nH Max) DCR (mOhm Max) Ipk (A) Secondary Output Pri Sec Bias 8.0 195 5 195 1.3 Vout=1.8V,3.3A 49.5 4.6 95 5 150 1.2 Vout=2.5V,2.4A 65 58.5 3.9 138 7 180 1.2 Vout=3.3V,1.8A 1 : 0.35 60 54.0 2.3 130 9 165 1.1 Vout=5.0V,1.2A 1 : 0.35 55 49.5 0.7 95 17 150 1.1 Vout=12V,0.5A Notes: 1. Inductance is measured at 250kHz, 0.3Vrms. 2. Peak primary current, Ipk, is drawn at minimum input voltage. 3. DCR for the primary and for the secondary are with the windings connected in parallel. 4. Leakage Inductance is for the primary winding with the secondary winding shorted. 5. Turns ratio are with the primary and the secondary windings connected in parallel. 6. Output of the secondary is with the windings connected in parallel. Bias winding output is 12V, 20mA. 7.Operating temperature range: -40C to +125C. The part temperature (ambient temperature + temperature rise) should not exceed the upper limit of the operating temperature under worst case operating conditions. Circuit design, component placement, PWB trace size and thickness, airflow and other cooling provisions all affect the part temperature. Part temperature should be verified in the end application. 2/F Block A, 94 Tokwawan Road, Kowloon, Hong Kong 1 Tel: (852) 2765 3888 Fax: (852) 2954 3304 PX206(01) Revised in 06/12 POWER TRANSFORMER Flyback Transformer for PoE E & E Magnetic Products Limited Providing Power to PoE devices with up to 6 Watts MECHANICAL DIMENSIONS .492 12.50 .089 2.26 .675 MAX 17.15 .098 2.50 7 12 EE .865 MAX 21.97 .900 22.86 835-008xx (DATE) .060 1.52 Pin 1 location 6 1 Recommended Pad Layout .028 0.71 .330 8.38 MAX .012.008 0.300.20 REFERENCE OR GAUGE PLANE .098.010 2.500.25 .050-.080 1.27-2.03 .492.010 12.500.25 Notes: 8. All dimensions are specified in inches with higher precedence in inches. mm Weight (in gram) : 6.2 typ. Tape & Reel : 250 / reel 9. Unless otherwise specified, all tolerances are .010 . 0.25 10. Coplanarity: .004 max. 0.10 SCHEMATICS 1 2 Pri 8 7 11 12 10 Bias Sec 6 5 3 FOR MORE INFORMATION, PLEASE CONTACT HEADQUARTER 2/F Block A, Merit Industrial Centre, 94 Tokwawan Road, Kowloon, Hong Kong Tel: (852) 2765 3888 Fax: (852) 2954 3304 Email: eempl@eleceltek.com Website: http://www.eleceltek.com Information herein is for reference only and subject to change without notice. It does not constitute any representation, warranty or commitment of the company in respect of the products in any aspect. All logos, brands and product names mentioned herein are trademarks or registered trademarks of their respective owners. The company does not assume any liability arising out of the application or use of any product or circuit described herein. Copyrights 2006, E & E Magnetic Products Limited. 2/F Block A, 94 Tokwawan Road, Kowloon, Hong Kong 2 Tel: (852) 2765 3888 Fax: (852) 2954 3304 PX206(01) Revised in 06/12