Differences Between the UCC28251 and UCC28250 and Evaluation of the UCC28251 in (Rev. A)

The UCC28251 is a functional variant of the UCC28250 PWM Controller. While the same basic functionality of the UCC28250 is largely maintained the UCC28251 is designed to operate at a lower frequency (minimum of 27 kHz when programmed by RT pin) allowing operation in 400-V input DC-to-DC converters in off-line AC-to-DC power supplies where frequency-dependent high-voltage switching lossesare an