The SG1844/45 family of control ICsprovides all the necessary features to implement off-line fixed frequency,current-mode switching power supplies with a minimum number of external components. Current-mode architecture demonstrates improved line regulation,improved load regulation, pulse-bypulse current limiting and inherent protection of the power supply output
switch.The bandgap reference is trimmed to ±1% over temperature. Oscillator discharge current is trimmed to less than ±10%. The SG1844/45 has undervoltage lockout, current-limiting circuitry
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