Design Example Report
No Electrolytic Capacitor, High Efficiency
(≥90%), High Power Factor (>0.9) 15 W LED
Driver Using LinkSwitchTM-PH LNK407EG
Title
Specification 90 VAC – 265 VAC Input; 30 V, 500 mA Output
Application
Author
LED Driver
Applications Engineering Department
Document
Number
DER-278
Date
April 19, 2011
1.0
Revision
Summary and Features
No electrolytic capacitors
Clean monotonic start-up – no output blinking
Fast start-up (<100 ms) – no perceptible delay
Highly energy efficient
o
≥90% at 230 VAC
Low cost, low component count and small printed circuit board footprint solution
o No current sensing required
o Frequency jitter for smaller, lower cost EMI filter components
Integrated protection and reliability features
o Output open circuit / output short-circuit protected with auto-recovery
o Line input overvoltage shutdown extends voltage withstand during line faults.
o Auto-recovering thermal shutdown with large hysteresis protects both components
and printed circuit board
o No damage during brown-out or brown-in conditions
Meets IEC 61000-4-5 ring wave, IEC 61000-3-2 Class C harmonics and EN55015 B
conducted EMI
PATENT INFORMATION
The products and applications illustrated herein (including transformer construction and circuits external to the products) 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 grants its customers a license under
certain patent rights as set forth at <http://www.powerint.com/ip.htm>.
Power Integrations
5245 Hellyer Avenue, San Jose, CA 95138 USA.
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com