RD8 POWERINT | Alldatasheet

Document overview

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Technical content

85 to 265 VAC Input, 3 W Output Low Cost Production Worthy AC Adapter Reference Design

  • Cost competitive with linear solutions (regulated 50/

60 Hz transformers)

  • Lowest component count switching solution
  • Ultra low no-load power consumption (30/70 mW @115/

230 VAC)

  • Simple low cost two-winding transformer
  • Greater than 72% efficiency
  • Low average EMI, only one inductive component required for EMI filtering
  • Small size Designed for World Wide Operation
  • Designed for IEC/UL safety requirements
  • Meets FCC/VDE Class B EMI specifications
  • Wide range input voltage

Description

The RD8 reference design board is an example of a low cost production worthy design for an AC wall adapter or similar applications requiring small size, high efficiency, and low cost. The RD8 utilizes the TNY254 member of the TinySwitch family of low cost Off-line Switchers from Power Integrations. It is intended to help TinySwitch users develop their products quickly by providing a production ready design which needs little or no modification to meet system requirements. The RD8 is designed to replace conventional linear AC wall adapters, offering universal input range, smaller size, and high efficiency, all at a competitive cost. The RD8 is cost-competitive with linear solutions (regulated 50/60 Hz transformers). The unique ON/OFF control scheme of Tinyswitch virtually eliminates energy consumption at no load. Typical linear wall adapters consume 1-4 watts at no load, which costs $1-$4 per year ( based on $0.12/kWhr). In comparison, a typical TinySwitch supply consumes 30-70 mW at no load, offering substantial energy savings. Reference Design Board TinySwitch TM March 1999 Figure 1. RD8 Board Overall Physical Dimensions. Table 1. Table of Key Electrical Parameters.

  • Can be improved to ± 5% by using a more accurate Zener (± 2%).

Figure 3. Component Legend for the RD8. Figure 2. Schematic Diagram of the 3 W RD8 Power Supply.

265 VAC input voltage, suitable for replacing conventional

the high voltage DC bus applied to the primary winding of T1.

Table 2. Parts List for the RD8. can also be used at a small additional cost for higher efficiency. L2, and C7 to create the 9 V output voltage. increases no load power consumption (15-75 mW). accepted by safety agencies. measured with AC voltage applied to the RD8.

  • For transformer sources, please visit the Power Integrations website at www.powerint.com.

Figure 18. Electrical specification of transformer TRD8.

3000 VAC

60 Hz, 1 minute,

Figure 19. Construction details of transformer TRD8. wire in four layers. Finish on Pin 4. from left to right. Finish on Pin 9.

  • Triple insulated wire sources.

Furukawa Electric America, Inc.

200 Westpark Drive

Figure 20. Electrical specification of transformer TRD8-1.

Figure 21. Construction details of transformer TRD8-1. wire in four layers. Finish on Pin 4. on pin side of bobbin. Match height of secondary winding. from left to right in a single layer. Finish on Pin 9. Apply 3 layers of 17.5 mm tape for outer insulation.

C KOREA Power Integrations International Holdings, Inc. Rm# 402, Handuk Building, 649-4 Yeoksam-Dong, Kangnam-Gu, Seoul, Korea Phone: +82•2•568•7520 JAPAN Power Integrations, K.K. Keihin-Tatemono 1st Bldg. 12-20 Shin-Yokohama 2-Chome, Kohoku-ku, Yokohama-shi, Kanagawa 222, Japan Phone: +81•45•471•1021 Fax: +81•45•471•3717 EUROPE & AFRICA Power Integrations (Europe) Ltd. Centennial Court Easthampstead Road Bracknell Berkshire RG12 1YQ, United Kingdom Phone: +44•1753•622•208 Fax: +44•1753•622•209 WORLD HEADQUARTERS NORTH AMERICA - WEST Power Integrations, Inc. 477 N. Mathilda Avenue Sunnyvale, CA 94086 USA Main: +1•408•523•9200 Customer Service: Phone: +1•408•523•9265 Fax: +1•408•523•9365 NORTH AMERICA - EAST & SOUTH AMERICA Power Integrations, Inc. Eastern Area Sales Office

1343 Canton Road, Suite C1

Marietta, GA 30066 USA Phone: +1•770•424•5152 Fax: +1•770•424•6567 For the latest updates, visit our website: 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. PI Logo and TOPSwitch are registered trademarks of Power Integrations, Inc. ©Copyright 1999, Power Integrations, Inc. 477 N. Mathilda Avenue, Sunnyvale, CA 94086 TAIWAN Power Integrations International Holdings, Inc. 2F, #508, Chung Hsiao E. Rd., Sec. 5, Taipei 105, Taiwan Phone: +886•2•2727•1221 Fax: +886•2•2727•1223 INDIA (Technical Support) Innovatech #1, 8th Main Road Vasanthnagar Bangalore 560052, India Phone: +91•80•226•6023 Fax: +91•80•228•2191 APPLICATIONS HOTLINE World Wide +1•408•523•9260 APPLICATIONS FAX World Wide +1•408•523•9361