EP11 datasheet(40/46 Pages) POWERINT

40 / 46 page

EPR-00011 - 70 W Adapter

22-Jan-01

Page 40 of 46

Power Integrations Inc

Tel: +1 408 414 9200 Fax: +1 408 414 9201

www: http://www.powerint.com

Input and Output Diodes:

For the power diodes the maximum junction temperature is generally 150

oC.

Depending on the required product life expectancy and the maximum lead

temperature of the PC board material chosen, the actual allowed maximum

junction temperature (TJ ) may be significantly less. Also the junction temperature

(TJ ) will be significantly higher than the tab temperature (TC) and must be

computed from the measured tab temperature and the estimated power

dissipation in the device using the thermal impedance junction to case (

JC) of the

device given in its data sheet.

Magnetic Components:

If the transformer and the other magnetic components use 130

oC magnet wire in

their construction, then the maximum hot spot temperature is limited to 105

oC.

Higher operating temperatures are possible with higher temperature rated wire.

Generally, however, the ferrite core temperatures should be limited to near 100

to maintain the saturation flux density.

13.5 Conclusion:

Careful design and rigorous testing are required to ensure that a design will perform

adequately under high load and high temperature conditions.

EP11 Datasheet(PDF) 40 Page - Power Integrations, Inc.