RD7 POWERINT | Alldatasheet
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Technical content
5 V ± 5%
Figure 2. Schematic diagram of the RD7. Figure 3. RD7 Pinout and Component Legend. The RD7 is designed for DC input. Please observe the proper polarity when applying power to this board. Applying reverse polarity or AC power to the input terminals of the board can damage the TOPSwitch .
transformer turns ratios and the value of the Zener diode VR1. to a safe value and reduce ringing at the DRAIN of U1. reduce output ripple to a primary load. **Table 2. Parts List For the RD7. (* Optional, for Css values see Figure 9. T1 is available from Premier Magnetics (714) 362-4211 as P/N
Figure 4. Schematic diagram of the RD7 with 12V Non-isolated output.
5 V ± 2%
measured with DC voltage applied to RD7. efficiency is greater than 72% throughout the input range. voltage DC bus and 5 V output voltage for the RD7 circuit. point the power supply turns on as shown. can range in value from 10 mF to 47 mF as shown. peak ripple is less than 50 mV at 3.5 W. The response is quick and well damped. The RD7 is designed to meet worldwide safety specifications.
600 Output Voltage (mV)
Figure 8. Efficiency vs. Output Power.
3000 VAC
60 Hz, 1 minute,
Figure 13. Electrical Specification of Transformer TRD7.
right to left for a total of 116 turns. Finish at Pin 1. Apply 1 layer of tape for basic insulation. wire from left to right in a single layer. Finish at Pin 3. Apply 1 layer of tape for basic insulation. triple insulated wire from left to right. Finish on Pin 6, 7. Apply 3 layers of tape for basic insulation. Assemble and secure core halves. Impregnate uniformly with varnish.
- Triple insulated wire sources.
Furukawa Electric America, Inc.
200 Westpark Drive
Figure 14. Construction Details of Transformer TRD7.
35 AWG
Figure 15. Electrical Specification of Transformer TRD7-1.
wide tape. Match height of primary plus bias winding. sleeving with 0.4 mm (0.016 in) minimum wall thickness. Apply 1 layer of 11.5 mm wide tape for basic insulation. heavy nyleze wire from left to right in a single layer. Finish on Pin 3. Sleeve start and finish leads as above. wide tape. Match height of secondary winding. on Pin 6 and 7. Sleeve start and finish leads as above. Apply 3 layers of 17.5 mm tape for outer insulation. Figure 16. Contruction Details of Transformer TRD7-1.
B RD7
B 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 EUROPE & AFRICA Power Integrations (Europe) Ltd. Centennial Court Easthampstead Road Bracknell Berkshire RG12 1YQ, United Kingdom Phone: +44•1344•462•300 Fax: +44•1344•311•732 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 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 1998, Power Integrations, Inc. 477 N. Mathilda Avenue, Sunnyvale, CA 94086 http://www.powerint.com 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 Notes Measurement method for primary leakage inductance of TRD7 and TRD7-1 corrected. Date Revision A B