EDN Magazine — 04.28.94 Comparator improves regulator's efficiency (figure)

FIGURE 1

Fig 1—In this 11W current-mode flyback converter, an external low-offset comparator, IC2A, overrides the output of regulator IC₁'s error amplifier. This technique allows you to use a significantly lower-value current-sense resistor, boosting efficiency from 80 to 88%.