Title
Engineering Prototype Report for EP-91 –
12 W Power Supply using
TinySwitch
®
-III (TNY278P)
Specification
85-265 VAC Input, 12 V, 1 A Output
Application
Author
Document
Number
Date
Revision
TinySwitch-III
Reference Design (DAK-91)
Power Integrations Applications Department
EPR-91
7-February-06
1.1
Summary and Features
•
EcoSmart
®
– 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 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
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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POWERINT [ POWER INTEGRATIONS, INC. ]
