Features: *Optimized For Off-line And DC To DC Converters*Low Start Up Current (<1mA)*Automatic Feed Forward Compensation*Pulse-by-pulse Current Limiting*Enhanced Load Response Characteristics*Under-voltage Lockout With Hysteresis*Double Pulse Suppression*High Current Totem Pole Output*Internal...
UC3843: Features: *Optimized For Off-line And DC To DC Converters*Low Start Up Current (<1mA)*Automatic Feed Forward Compensation*Pulse-by-pulse Current Limiting*Enhanced Load Response Characteristics*Un...
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The UC
Differences between members of this family are the under-voltage lockout thresholds and maximum duty cycle ranges.The UC1842 and UC1844 have UVLO thresholds of 16V (on) and 10V (off),ideally suited to off-line applications.The corresponding thresholds for the UC1843 and UC1845 are 8.4V and 7.6V.The UC1842 and UC1843 can operate to duty cycles approaching 100%.A range of zero to 50% is obtained by the UC1844 and UC 1845 by the addition of an internal toggle flip flop which blanks the output off every other clock cycle.