Design Support

DN-89 Comparing the UC3842, UCC3802, and UCC3809 Primary Side PWM Controllers

Despite the fact that the UC3842 and the UCC3802 PWM Controllers are pin-for-pin compatible, they are not drop-in replacements for each other. Designed as the next generation '42, the UCC3809 also has differences that prevent a simple drop-in substitute. This design note will help the user change from either the UC3842 or the UCC3802 to the UCC3809 in an existing design. A table identifies the most notable features and functional differences among the three controllers.



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