AP3843CMTR-E1

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). 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 packages.

Applications

• Off-line Converter
• DC-DC Converter
• Voltage Adapter
• CRT Monitor Power Supply
• Desktop Power Supply
• DVD/STB Power Supply

Key features

• Low Start-up Current: 50μA
• Robust V_REF Line/Load Regulation
• Low Line Regulation : 4mV
• Low Load Regulation : 4mV
• High Stability of Reference Voltage over a Full Temperature Range: 0.2mV/°C
• 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