3843CM-E1

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