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| Design Idea DI-22 (R) TOPSwitch-GX 70 W, 19 V External Laptop Adapter Application Laptop Adapter Device TOP249Y Power Output 70 W Input Voltage 85-265 VAC Output Voltage 19 V Topology Flyback (R) Design Highlights * High efficiency: 84% at 85 VAC (with 50 C external ambient temperature) * Low component count and high power density, 7 W/in.3 * Very compact design (4.1 in. x 2.225 in. x 1.06 in.) * No surface mount components required * Low zero load power consumption, <370 mW at 115 VAC * Approximately constant overload power with line voltage * Line undervoltage detection (UV) and overvoltage (OV) shutdown * Low EMI - switching frequency jitter helps meet CISPR22B/ EN55022B limits * Fully protected for overload, short circuit and thermal faults Operation The design utilizes a TOP249Y in a flyback converter providing a 70 W output in a sealed enclosure at an external ambient of 50 C. Line UV and OV (100 V and 450 V, respectively) are implemented using a single 2 M resistor (R1). Undervoltage eliminates power-up/down glitches and overvoltage provides line transient and long duration power system surge protection. Resistor R10 programs the internal current limit to 75% of nominal at the UV threshold. As a function of input voltage the current limit is further reduced by R9 to provide approximately constant overload power. The larger TOPSwitch-GX selection reduces conduction losses, raising efficiency (without circuit changes or increased overload power) and permits a higher inductance design for reduced primary RMS currents, further increasing efficiency. D2 MBR20100 C13 C12 C11 0.33 F 0.022 F 0.01 F 400 V 400 V 400 V C7 2.2 nF Y1 Safety 1 2 9 VR1 P6KE200 2 BR1 RS805 8 A 600 V D1 UF4006 3 D3 MBR20100 C3 820 F 25 V L1 200 H C14 0.1 F 50 V 19 V, 3.6 A RTN 11 8 L2 820 H 2A C6 0.1 F X2 C1 150 F 400 V D R11 2 M 1/2 W T1 L D4 1N4148 6 5 C2 820 F 25 V U2 PC817A C15 R1 270 R8 4.7 50 V C4 820 F 25 V R4 31.6 k 1% R2 1 k R13 562 C9 1% 4.7 nF 50 V C10 0.1 F 50 V R6 4.75 k 1% PI-2691-033001 TOPSwitch-GX 1 F C RT1 10 1.7 A F1 3.15 A t L3 75 H 2A R9 13 M S CONTROL TOP249Y U1 R3 6.8 C5 47 F 16 V X F R10 20.5 k C8 0.1 F 50 V U3 TL431 R7 56 k 85-265 VAC Figure 1. TOPSwitch-GX 70 W Laptop Adapter Schematic. DI-22 www.powerint.com September 2002 DI-22 To reduce winding and diode dissipation the secondary is split into two windings and diode OR'ed into the output capacitors (C2, 3). Regulation is provided by a secondary side reference (U3), the output voltage sensed by R4, R13 and R6. TRANSFORMER PARAMETERS Core Material Bobbin FPQ26/20-A 2 TDK PC40 gappped for ALG = 843 nH/T TDK BPQ26/20-1112CP Primary: 9T + 9T, 2 x 26 AWG Shield: 1T, 8 mm x 0.015 mm Cu foil Secondary 1: 3T, 3 x 26 AWG T.I.W. Secondary 2: 3T, 3 x 26 AWG T.I.W. Bias: 2T, 8 mm x 0.015 mm Cu foil (T.I.W. = Triple Insulated Wire) Primary (2-1), Shield (1-NC), tape, Secondary 1 (12-9), Secondary 2 (11-8), Bias (6-5), tape, Primary (3-2), tape Primary: 273 H 10%, Leakge: 3 H (maximum) 1.5 MHz (minimum) Key Design Points * D1 and VR1 clamp leakage inductance spikes. A Zener clamp provides lower zero load consumption than an RCD clamp and higher efficiency below full load. * C11 reduces VR1 dissipation, raising efficiency. * Additional differential filtering is provided by C13 and L3. * C12 provides high frequency bypass, reducing high frequency EMI. * Use foil windings to reduce dissipation and reduce leakage inductance. * Sandwich secondary winding between two halves of primary to reduce leakage inductance. * High core temperature reduces saturation flux density. Keep flux density below 3000 gauss (0.3 T) to prevent saturation. * Use 100 V Schottky diodes for highest efficiency. * Good layout practices should be followed: - Locate C8, R3, C5, R9, R10 and R11 close to U1. - Power and signal source currents should be separated, joined using a Kelvin connection at the SOURCE pin. - Minimize the primary and secondary loop areas to reduce parasitic leakage and EMI. * Consult DAK-11 and EPR-11 for more information. Winding Details Winding Order (Pin Numbers) Inductance Primary Resonant Frequency Table 1. Transformer Construction Information. 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 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 and EcoSmart are registered trademarks of Power Integrations, Inc. PI Expert is a trademark of Power Integrations, Inc. (c)Copyright 2002, Power Integrations, Inc. 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 A 9/02 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 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 APPLICATIONS HOTLINE World Wide +1-408-414-9660 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 FAX World Wide +1-408-414-9760 www.powerint.com |
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