140W SMT PLANAR TRANSFORMER AND INDUCTOR For use with Linear Technology’s LT1725® PLANAR TRANSFORMER – PA0423 ! NEW Power Rating: 140W (48v to 12v/11.7A) Height: 8.4mm Max Footprint: 23.4mm x 20.1mm Max PLANAR INDUCTOR – PA0465 and PA0480 Energy Storage: up to 340µJ (4.2µH/12.8A) Height: 7.4mm Max Footprint: 23.4mm x 20.1mm Max Electrical Specifications @ 25°C — Operating Temperature -40°C to 125°C Part Number Power Rating 2 Turns Ratio (Pri:Sec:Aux) Primary Secondary Isolation Primary Inductance (µH MIN) Leakage Inductance (µH MAX) Primary (mΩ MAX) DCR Primary Aux. (mΩ MAX) Secondary (mΩ MAX) PA0423 140 W (12v/11.7A) 8:4:4 1500 Vdc Basic 140 0.1 55 500 7.0 Electrical Specifications @ 25°C — Operating Temperature -40°C to 125°C DCR (mΩ MAX) Main Winding Aux. Winding (7-11) (1-6) Saturation Current 4 (A) Part Number Inductance @Irated (7-11) (µH ±12%) Irated 3 (ADC) Turns Ratio (Main Winding to Aux.) Inductance @ 0 ADC (µH ±12%) @ 25°C @ 100°C Heating Current 5 (A) PA0465 4.2 12.8 4:5 2.8 460 4.4 16 15 37 PA0480 5.8 8.5 4:5 2.8 460 6.2 11 10 37 Mechanicals PA0423 Schematics SUGGESTED PAD LAYOUT 2 5 1 PA0423 Date Code Country of Origin 6 8T (PRI) 4T (SEC) 4T (AUX) 11 7 PA0465/PA0480 SUGGESTED PAD LAYOUT 1 6 PA0465 PA0480 Date Code Country of Origin 5T (AUX) 4T (IND) 11 7 PA0423 PA0465/PA0480 Weight ..................11.0 grams ..................11.0 grams Tape & Reel...............180/reel .......................250/reel Tray .............................40/tray.........................90/tray Dimensions: Inches mm Unless otherwise specified, all tolerances are ± .010 0,25 US 619 674 8100 • UK 44 1483 401 700 • France 33 3 84 35 04 04 • Singapore 65 6287 8998 • Taiwan 886 2 2698 0228 • Hong Kong 852 2788 6588 • http://www.pulseeng.com P569.B (12/02) 100W SMT PLANAR TRANSFORMER AND INDUCTOR For use with Linear Technology’s LT1725® Notes from Tables For P0465 and P0480: Planar Inductor 3. The rated current as listed is either 85% of the saturation current or the heating current depending on which value is lower. 1. The PA0423 transformer and PA0465/PA04680 inductor were designed for use with Linear Technology's LT1725® and LTC1693® IC's and form the foundation of a low cost, discrete component alternative to telecom power modules. The PA0423 transformer and PA0465/PA04680 inductor were designed for (but not limited to) the following applications: Topology: Single switch Forward Frequency: 230kHz Pri./Sec. Isolation: Basic Insulation (1500Vdc) Input Voltage: 36-75v telecom input Output Voltage: 12v / 11.7A output 4. The saturation current is the current which causes the inductance to drop by 15% at the stated ambient temperatures (25°C, 100°C). This current is determined by placing the component in the specified ambient environment and applying a short duration pulse current (to eliminate self-heating effects) to the component. 5. The heating current is the dc current which causes the temperature of the part to increase by approximately 45°C. This current is determined by mounting the component on a PCB with a .25" wide, 2oz. Equivalent copper traces, and applying the current to the device for 30 minutes with no force air cooling. For PA0423: Basic Insulated Planar Transformer: 2. To determine if the transformer is suitable for your application, it is necessary to ensure that the temperature rise of the component (ambieint plus temp. rise) does not exceed its operating temperature. To determine the temperature rise of the component it is necessary to calculate the total power losses (core and copper) in the application. 6. In high volt*time applications additional heating in the component can occur due to core losses in the inductor which may neccessitate derating the current in order to limit the temperature rise of the component. In order to determine the approximate total losses (or temperature rise) for a given application both copper an core losses should be taken into account Total Copper Losses (Pcu total(W)): Pcu total(W) = sum of the losses in each winding The losses in each winding can be calculated by: Pcu(W) = .001* DCR(mΩ) * (Irms2) Core Losses (Pcore(W)) To calculate core loss, use the following formula: CoreLoss (W) = 1.92 * 10-13 (∆B)2.5 * (Freq kHz)1.8 where: ∆B = 22653.1 * Vin min * Dutycycle max / Freq kHz Total Losses: P total = Pcu total + CoreLoss Temperature Rise: The approximate temperature rise can be found by looking up the calculated total losses in the temperature rise vs. power dissipation curve. Inductor Voltage vs. Core Loss 15 10 5 6.0 5.0 4.0 3.0 2.0 1.0 0.0 0 0.1 0.2 0.3 0.4 Core Loss (W) 0.5 0.6 Temperature Rise 20 0.7 0 5 10 15 20 25 100 80 60 40 20 0 Current (A) PA0465 @ 25°C PA0465 @ 100°C Temperature Rise vs. Power (W) Dissipation 120 7.0 Inductance (uH) Inductor Voltage 7. LT1725® and LTC1693® are registered trademarks of Linear Technology Corporation. Inductance vs Current 25 0 Total Copper Losses (Pcu_total(W)): Pcu(W)= .001* DCR(mΩ) * (Irms2) where: Irms = (Idc2 + (∆1/2)2).5 ∆1 = ripple current through inductor Core Losses (Pcore(W)): Use the Inductor Voltage versus CoreLoss table to determine the approximate core losses Total Losses: P total = Pcu total + CoreLoss Temperature Rise: The approximate temperature rise can be found by looking up the calculated total losses in the temperature rise vs. power dissipation curve. 0 1 2 3 4 5 6 Total Power (W) Dissipation PA0480 @ 25°C PA0480 @ 100°C For More Information : UNITED STATES (Worldwide) UNITED KINGDOM (Northern Europe) FRANCE (Southern Europe) SINGAPORE (Southern Asia) TAIWAN, R.O.C. (Northern Asia) HONG KONG (China/Hong Kong) 12220 World Trade Drive San Diego, CA 92128 U.S.A. http://www.pulseeng.com TEL: 858 674 8100 FAX: 858 674 8262 1 & 2 Huxley Road The Surrey Research Park Guildford, Surrey GU2 5RE United Kingdom TEL: 44 1483 401700 FAX: 44 1483 401701 Zone Industrielle F-39270 Orgelet France TEL: 33 3 84 35 04 04 FAX: 33 3 84 25 46 41 150 Kampong Ampat #07-01/02 KA Centre Singapore 368324 TEL: 65 6287 8998 FAX: 65 6280 0080 3F-4, No. 81, Sec. 1 HsinTai Wu Road Hsi-Chih, Taipei Hsien Taiwan, R.O.C. Tel: 886 2 2698 0228 FAX: 886 2 2698 0948 19/F, China United Plaza 1008 Tai Nan West Street Cheung Sha Wan, Kowloon Hong Kong, China TEL: 852 2788 6588 FAX: 852 2776 1055 DISTRIBUTOR Performance warranty of products offered on this data sheet is limited to the parameters specified. Data is subject to change without notice. Other brand and product names mentioned herein may be trademarks or registered trademarks of their respective owners. Printed on recycled paper. ©2002, Pulse Engineering, Inc. P569.B (12/02) 7