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www.powerint.com A 11/02 DI-39 WORLD HEADQUARTERS AMERICAS Power Integrations, Inc. San Jose, CA 95138 USA Customer Service: Phone: +1 408-414-9665 Fax: +1 408-414-9765 e-mail: usasales@powerint.com CHINA Power Integrations International Holdings, Inc. China Phone: +86-755-8367-5143 Fax: +86-755-8377-9610 e-mail: chinasales@powerint.com SINGAPORE Power Integrations, Singapore Republic of Singapore 308900 Phone: +65-6358-2160 Fax: +65-6358-2015 e-mail: singaporesales@powerint.com JAPAN Power Integrations, K.K. Keihin-Tatemono 1st Bldg. Japan Phone: +81-45-471-1021 Fax: +81-45-471-3717 e-mail: japansales@powerint.com EUROPE & AFRICA Power Integrations (Europe) Ltd. United Kingdom Phone: +44-1344-462-300 Fax: +44-1344-311-732 e-mail: eurosales@powerint.com KOREA Power Integrations International Holdings, Inc. Seoul, Korea Phone: +82-2-782-2840 Fax: +82-2-782-4427 e-mail: koreasales@powerint.com TAIWAN Power Integrations International Holdings, Inc. Taipei, Taiwan Phone: +886-2-2727-1221 Fax: +886-2-2727-1223 e-mail: taiwansales@powerint.com INDIA (Technical Support) Innovatech Bangalore, India Phone: +91-80-226-6023 Fax: +91-80-228-9727 e-mail: indiasales@powerint.com APPLICATIONS HOTLINE APPLICATIONS FAX World Wide +1-408-414-9660 World Wide +1-408-414-9760 Table 1. Transformer Construction Information. Key Design Points • Use of foil for the 3.3 V and 5 V windings also helps to optimize cross-regulation. • Optional capacitor C7 is the “soft-finish” capacitor and prevents overshoot on startup. • Compact layout for components D7, D10, D11, C11, C12, C15 will improve cross-regulation and efficiency. Compact layout for L2, L3, L4, C17, C18, and C20 will achieve best output ripple. • Figure 2 shows conducted EMI at 230 VAC full load, with output “Artificial Hand” grounding. Floating output return gives lower results. • Table 2 shows the cross regulation of the supply over load for both 115 VAC and 230 VAC. Table 2. Worst Case Cross Regulation at 115 VAC and 230 VAC. Output Voltage (V) Load Range (%) 3.3 10-100 5 10-100 12 10-100 -12 100 Cross Regulation (%) -4 -3 -2 -1 0 1 2 3 4 Figure 2. EMI at 230 VAC Full Load with "Artificial Hand" Grounding of Output. TRANSFORMER PARAMETERS Core Material EEL25 Himag MZ4 EEL25.4, Taiwan AL of 344 nH/T2 Bobbin EEL25 Vertical 14 Pins Primary Resonant Frequency Winding Order (Pin Numbers) Winding Details Primary Inductance (Pins 1-4 all others open) 1.42 mH ±10% at 132 kHz 300 kHz minimum Leakage Inductance 30 µH maximum Shield: 32T x 2 x 32 AWG Primary: 64T x 2 x 32 AWG Bias: 10T x 4 x 32 AWG Shield: 2T x 8 x 32 AWG +3.3V: 4T x foil 0.052 x 14 mm +5V: 1T x foil 0.052 x 14 mm +12V: 4T x 4 x 32 AWG -12V: 7T x 4 x 32 AWG Shield (NC-5), tape, Primary (1-4), tape, Bias (7-6), tape, Shield (5-NC), tape, +12 V (13-8), +3.3 V (11,12-9,10), +5 V (9-10,13), tape, -12 V (14-11, 12), tape 1.0 0.15 10.0 -100.0 -20 -10 0 10 20 30 40 50 60 80 70 MHz QP AV Average Quasi Peak For the latest updates, visit our Web site: www.powerint.com Power Integrations reserves the right to make changes to its products at any time to improve reliability or manufacturability. Power Integrations does not assume any liability arising from the use of any device or circuit described herein, nor does it convey any license under its patent rights or the rights of others. The products and applications illustrated herein (including circuits external to the products and transformer construction) may be covered by one or more U.S. and foreign patents or potentially by pending U.S. and foreign patent applications assigned to Power Integrations. A complete list of Power Integrations’ patents may be found at www.powerint.com. The PI Logo, TOPSwitch, TinySwitch, LinkSwitch and EcoSmart are registered trademarks of Power Integrations, Inc. PI Expert is a trademark of Power Integrations, Inc. ©Copyright 2002, Power Integrations, Inc. |
