CURRENT MODE PWM CONTROLLER
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.
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/ °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
Applications
· Off-line Converter
· DC-DC Converter
· Voltage Adapter
· CRT Monitor Power Supply
· Desktop Power Supply
· DVD/STB Power Supply