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Topswitch259EN DI-182 flyback Max power

Posted by: tjklotz on
Working with two Power Integrations products for transformer design. PIXI's designer #7 and DI-182 indicate that 65W is possible on a EE28 core size. PI Expert 7 on the other hand indicates 63.8W maximum and will not allow me to choose that size (It bumps me up to EERL28 when designing a flyback for the TOP259EN switch). Based on other reference, the 65W should not be a problem. Why would the PI Expert contradict the Power Integrations reference? This is relevant to the future transformer designs using a Power Integration switch, to know whether PI Expert is valid or not. Thank you, Tj

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Submitted by PI-Spock on 11/25/2008

This power level is right on the edge of what we think is the power processing limit of this core. PI Expert software uses fairly conservative numbers while choosing the transformer core size... but at the end of the day these are just estimates. In DI-182 we max'd out the power out of the transformer core and checked that the thermal performance was within limits by measuring on actual power supply.