M8128A

MOSDESIGN SEMICONDUCTOR CORP. POWER FACTOR CORRECTION CONTROLLER POWER M8128A GENERAL DESCRIPTION The M8128A provides simple and high performance active power factor correction. The M8128A provides a controlled on-time to regulate the output DC voltage and achieve natural power factor correction. The maximum on-time of the external switch is programmable to ensure safe operation during AC brownouts. An innovative multi-vector error amplifier is built in to provide rapid transient response and precise output voltage clamping. A built in circuit will disable the controller if the output feedback loop is opened. FEATURES ‧ Low Input Current THD ‧ Controlled On-Time PWM ‧ Zero-Current Detection ‧ Leading-Edge Blanking instead of RC Filtering ‧ Low Start-up Current ‧ Low Operating Current ‧ Transition mode operation ‧ Under Voltage Lockout with Hystersis ‧ Feedback Open Loop Protection ‧ Programmable Maximum On-Time ‧ 8-pin DIP or 8-pin SOP APPLICATIONS ‧ Electronic Lamp Ballasts ‧ AC-DC Switching Mode Power Converters ‧ Open Frame Power Supplies and Power Adapters ‧ Flyback Power Converters with ZCS/ZVS PIN ASSIGNMENT M8128A INV COMP MOT 1 8 VDD OUT VSS CS 4 5 ZCD 1/5 2013-11-15 MOSDESIGN SEMICONDUCTOR CORP. POWER FACTOR CORRECTION CONTROLLER BLOCK DIAGRAM MOT 3 COMP 2 INV 1 2.5V + - 2.75V 0.45V + - + - ZCD 5 CS 4 2V 0.8V + - + - Maximum On Time Saw Tooth Generator + - UVLO Start Up 2.75V 2.5V 2V 0.8V 0.45V VDD 8 Bandgap R Q S Driver 6 VSS POWER M81...