piclist 2002\09\28\044332a >
Thread: 2-tran SMPS 5v reg now 90% efficicient!
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picon face BY : Morgan Olsson email (remove spam text)



For both To92 and E-line, keeping very short leads, soldered to large copper areas is fundamental to high power dissipation.

This goes especially for the collector, on which the chip is mounted.

This is hard to find for hole mount packages, but for SMT devices they often specifies what power at what collector copper areas.  This will give an idea, then remember the heat resistance of the hole mount devices leads will degrade power handling in respecitve to SMT devices.

/Morgan

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