SMT PLANAR TRANSFORMER AND PLANAR INDUCTOR For use with Linear Technology’s LT1681 and LTC1698 PLANAR TRANSFORMER – PA0191 Power Rating: 60-100W Height: 8.3 mm Max Footprint: 27.7 mm x 21.8 mm Max ! W E N PLANAR INDUCTOR – P1977 Energy Storage: 420 µJ (2.1 µH/20A) Height: 8.3 mm Max Footprint: 21.7 mm x 20.3 mm Max Electrical Specifications @ 25°C — Operating Temperature -40°C to 125°C Part Number Power Rating 1 Turns Ratio (with 7T Pri. Aux.) Primary Secondary Isolation Primary Inductance (µH MIN) Leakage Inductance (µH MAX) Primary (mΩ MAX) DCR Primary Aux. (mΩ MAX) Secondary (mΩ MAX) PA0191 60-100 W 9:2 1500 Vdc Basic 100 1.5 85 800 2.5 Electrical Specifications @ 25°C — Operating Temperature -40°C to 125°C Part Number Inductance @Irated (µH ±5%) Irated 2 (ADC) P1977 2.1 20 DCR (mΩ) TYP MAX Inductance @ 0 ADC (µH ±5%) 1.00 1.25 2.1 Saturation Current 3 (A) @ 25°C @ 125°C Heating Current 4 (A) 27.0 22.5 31 Mechanicals PA0191 Schematics .530 13,46 .305 7,75 .530 13,46 2X .100 2,54 4X .060 1,52 .235 5,97 PIN 2 PIN 1 .915 .551 23,24 14,00 PA0191 Date Code Country of Origin 2X .100 2,54 .265 6,73 4XØ .080 2,03 PIN 3 .405 10,29 .180 4,57 2XØ .100 2,54 .005/0,13 4 SURFACES 9T 2T 3 7T 4 SUGGESTED PAD LAYOUT 1 PA0191 1 .275 6,99 2 .800 20,32 .360 MAX 9,14 .360 9,14 PIN 1 2 .855 MAX 21,72 .325 8,26 MAX .005/0,13 3 SURFACES 5 2X .150 3,81 P1977 Date Code Country of Origin 7 PIN 7 .180 4,57 .360 9,14 .325 8,26 MAX 1 2 .915 23,24 1.090 27,69 MAX PIN 5 .360 9,14 .860 MAX 21,84 PIN 4 PIN 2 .275 6,99 2X .150 3,81 SUGGESTED PAD LAYOUT 3T PA0191 P1977 Weight ..................11.0 grams ..................10.8 grams Tape & Reel...............150/reel .......................150/reel Tray .............................55/tray.........................48/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 65 287 8998 • Taiwan 886 2 2698 0228 • Hong Kong 852 2788 6588 • http://www.pulseeng.com P553.A (7/02) SMT PLANAR TRANSFORMER AND INDUCTOR For use with Linear Technology’s LT1681 and LTC1698 Notes from Tables For PA0191: Basic Insulated Planar Transformer 1.To determine if the transformer is suitable for your application it is necessary to ensure that the temperature rise of the component (ambient 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 (copper and core) in the application. Total Copper Losses CopperTotal (W) = sum of the losses in each winding The losses in each winding can be calculated by: CopperWindingX (W) = .001 * DCR(mΩ) * (Irms2) Core Losses To calculate the core loss, use the following formula: CoreLoss (W) = 2.5E-8 * (Freq kHz)1.7 * (∆B/2000)2.5 where: ∆B/2000 = 1.01 * (Voltage Min * Dutycycle Max/Freq kHz) Temperature Rise TempRise (°C) = .603 * CopperTotal (W) * (50.6 * CoreLoss (W)/CopperTotal (W) + 88.1) For P1977: Planar Inductor 2.The rated current as listed is either the saturation current or the heating current depending on which value is lower. 3.The saturation current is the current which causes the inductance to drop by 10% at the stated ambient temperatures (25°C, 125°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. 4.The heating current is the dc current which causes the temperature of the part to increase by approximately 40°C. This current is determined by mounting the component on a PCB with a .25" wide (2 ounce equivalent copper traces) and applying the current to the device for 30 minutes. 5.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 and core losses should be taken into account. Total Copper Losses CopperTotal (W) = .001* DCR(mΩ) * (Irms2) where: Irms = (IDC2 + (∆I/2)2).5 Core Losses To calculate the core loss, use the following formula: CoreLoss (W) = 2.5E-8 * (Freq kHz)1.7 * (.0635 * ∆I)2.5 Temperature Rise TempRise (°C) = .603 * CopperTotal (W) * (50.6 * CoreLoss (W)/CopperTotal (W) + 88.1) The PA0191 transformer and P1977 inductor were designed for use with Linear Technology's LT1681 and LTC1698 IC's and are featured in Linear Technology's Design note 261 which details the solution for a low cost, discrete component alternative to telecom power modules. 2.00 The PA0191 transformer and P1977 inductor were designed for (but not limited to) the following application: Topology – Two-switch forward Frequency – 230 kHz Pri./Sec. Isolation – Basic Insulation (1500 Vdc) Input Voltage – 36-72 v telecom input Output Voltage(s) – 3.3 v / 20 A output (with an auxilary primary side control winding - 12 v/100 mA) Ind (µH) APPLICATION NOTES 2.50 P1977 Ind. vs. Current 1.50 1.00 0.50 0.00 0 5 10 15 Current (A) 25°C For More Information : 20 25 100°C 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: 65 287 8998 FAX: 65 280 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. P553.A (7/02)