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 current-mode control. The LM5021 features include an ultra-low (25 µA) 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 STAR®, 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 8-pin IC has total propagation delays less than 100 ns and a 1-MHz capable
oscillator that is programmed with a single resistor.
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