Comparing supposedly equivalent PWM Controller IC's

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eem2am

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hi

regarding these SMPS PWM Controller IC's..........

LT1243 is a pin for pin compatible replacement for UCC38C43 (it says so on first page of LT1243 datasheet)

so why on page 2 of the LT1243 datasheet is there a current source at the output of the error amplifier?

because this current source is not shown on the UCC38C43 block diagram on page 1 of the UCC38C43 datasheet



LT1243 DATASHEET
http://cds.linear.com/docs/Datasheet/1241fa.pdf

UCC38C43 DATASHEET
http://focus.ti.com/lit/ds/symlink/ucc38c43.pdf
 

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