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SNVS359E – MAY 2005 – REVISED DECEMBER 2014 LM5021 AC-DC Current-Mode PWM Controller
1 Features 3 Description The LM5021 off-line pulse width modulation (PWM)
controller contains all of the features needed to
implement highly efficient off-line single-ended
flyback and forward power converters using currentmode control. The LM5021 features include an ultralow (25 ВµA) start-up current, which minimizes power
losses in the high voltage start-up network. A skip
cycle mode reduces power consumption with light
loads for energy conserving applications (ENERGY
STARВ®, CECP, and so forth). Additional features
include under-voltage lockout, cycle-by-cycle current
limit, hiccup mode overload protection, slope
compensation,
soft-start
and
oscillator
synchronization capability. This high performance 8pin IC has total propagation delays less than 100 ns
and a 1-MHz capable oscillator that is programmed …
