[Promax-Johnton]

The PJ3842B series is high performance fixed frequency current mode controllers. This is specifically designed for Off-Line and DC-to-DC converter applications offering the designer a cost effective solution with minimal external components.This integrated circuits feature a trimmed oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier, current sensing comparator,and a high current totem pole output ideally suited for driving a power MOSFET.

FEATURES
• Trimmed Oscillator Discharge Current for Precise Duty Cycle Control
• Current Mode Operation to 500KHz
• Automatic Feed Forward Compensation
• Latching PWM for Cycle-By-Cycl e Current Limiting
• Internally Trimmed Reference with Undervoltage Lockout
• High Current Totem Pole Output
• Input Undervoltage Lockout with Hystersis
• Low Start-Up and Operating Current