AP3845C

CURRENT MODE PWM CONTROLLER General Description Features Data Sheet AP384XC The AP3842C/3C/4C/5C are high performance fixed frequency current-mode PWM controller series. These integrated circuits are optimized for off-line and DC-DC converter applications with minimum external components. They feature under-voltage lockout (UVLO) circuit with low start-up current, trimmed oscillator for precise duty cycle control, current sense comparator providing maximum current limiting and a totem pole output stage for increasing output current. In addition, these ICs also feature accurate protection against over-temperature, over-current and maximal output power. The AP3842C and AP3844C have UVLO thresholds of 16V(on) and 10V(off); The corresponding thresholds for AP3843C and AP3845C are 8.4 V(on) and 7.6V(off). · Low Start-up Current: 50μA · Robust VREF Line/Load Regulation Low Line Regulation : 4mV Low Load Regulation : 4mV · High Stability of Reference Voltage over a Full Temperature Range: 0.2mV/ oC · Operating Frequency up to 500kHz · High PWM Frequency Stability over a Full Temperature Range: 2.5% · High PWM Frequency Stability under a Full Supply Voltage Range: 0.2% · Accurate Over-temperature Protection with Hysteresis · UVLO with Hysteresis Applications The AP3842C and AP3843C can operate approaching · Off-line Converter 100% duty cycle; AP3844C and AP3845C can operate · DC-DC Converter from zero to 50% duty cycle. · Voltage Adapter · CRT Monitor Power Supply These IC...