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AP3843CM Datasheet(PDF) 1 Page - BCD Semiconductor Manufacturing Limited |
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AP3843CM Datasheet(HTML) 1 Page - BCD Semiconductor Manufacturing Limited |
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1 / 13 page  CURRENT MODE PWM CONTROLLER AP384XC Data Sheet 1 Sep. 2006 Rev. 1. 1 BCD Semiconductor Manufacturing Limited General Description 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 thresh- olds for AP3843C and AP3845C are 8.4 V(on) and 7.6V(off). The AP3842C and AP3843C can operate approaching 100% duty cycle; AP3844C and AP3845C can operate from zero to 50% duty cycle. These ICs are available in SOIC-8 and DIP-8 pack- ages. Features · 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 Tem- perature Range: 2.5% · High PWM Frequency Stability under a Full Sup- ply Voltage Range: 0.2% · Accurate Over-temperature Protection with Hys- teresis · UVLO with Hysteresis Applications · Off-line Converter · DC-DC Converter · Voltage Adapter · CRT Monitor Power Supply · Desktop Power Supply · DVD/STB Power Supply SOIC-8 DIP-8 Figure 1. Package Types of AP3842C/3C/4C/5C |
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