Application Notes

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 mos