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Title
Reference Design Report for a 12 W Power
Supply Using TinySwitch TM -III TNY278PG
Specification 85-265 VAC Input, 12 V, 1 A Output
Application
Author
Document
Number
Date
Revision
TinySwitch-III Reference Design
Applications Engineering Department
RDR-91
February 11, 2013
1.4
Summary and Features
? EcoSmart TM – Meets all existing and proposed harmonized energy efficiency standards
including: CECP (China), CEC, EPA, AGO, European Commission
?
?
?
?
? No-load consumption 140 mW at 265 VAC (no bias winding required)
? >75% active-mode efficiency (exceeds standards requirement of 71%)
BP/M capacitor value selects power MOSFET current limit for greater design flexibility
Output overvoltage protection (OVP) using primary bias winding sensed shutdown feature
Tightly toleranced I 2 f parameter (-10%, +12%) reduces system cost
? Increases MOSFET and magnetics power delivery
? Reduces overload power, which lowers output diode and capacitor costs
Integrated TinySwitch-III Safety/Reliability features
? Accurate (±5%), auto-recovering, hysteretic thermal shutdown function maintains safe
PCB temperatures under all conditions
?
?
Auto-restart protects against output short-circuit and open loop fault conditions
>3.2 mm creepage on package enables reliable operation in high humidity and high
pollution environments
?
?
Meets EN550022 and CISPR-22 Class B conducted EMI with >12 dBμV margin
Meets IEC61000-4-5 Class 3 AC line surge
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 .
Power Integrations
5245 Hellyer Avenue, San Jose, CA 95138 USA.
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
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