3845CM Datasheet PDF - BCD Semiconductor

●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