OB OB6573CPA

OB6573 is a 8-pin active power factor correction (PFC) controller designed to operate in continuous conduction mode (CCM) with average current control. It provides near unity power factor for universal input line voltage (85VAC – 265VAC) with no need to sense the line input voltage. The IC allows major reductions in Bill of Materials (BOM) component count, PCB area and design time compared to traditional solutions. The switching frequency of OB6573 is trimmed and fixed internally at 65KHz. To achieve good EMI performance, the built-in frequency shuffling is provided. Both compensation for the voltage loop and the current loop are external to allow full user control. Fast 1.5A gate drive capability minimizes the need for external driver circuit.

OB6573 offers comprehensive protections to ensure safe system operation conditions including cycle by cycle over current protection(OCP), soft over current protection(SOCP), VCC under voltage lockout (UVLO), VCC clamping, open loop protection (OLP), programmable brownout protection and soft-start.

In addition, for low standby power requirements, OB6573 can be driven into standby mode with total current consumption of 200uA (typical), by pulling the VSENSE pin voltage below 0.5V.

• 8-Pin Solution without Sensing Line Voltage
• Average Current Continuous Control Mode
• Fixed 65KHz Frequency with Frequency Shuffling for Better EMI
• Wide-range Universal AC Input Voltage
• Very Low Shutdown Currents (Typical 200uA)
• Maximum Duty Cycle of 97%
• Trimmed Internal Reference Input
• Brown-out Protection
• Cycle by Cycle Over Current Limit
• Soft Over Current Protection
• Output Over Voltage Protection
• Open Loop Protection
• Enhanced Dynamic Response Soft Start
• VCC Under Voltage Lockout (UVLO)
• Pin to Pin Compatible with Industry Standard

• CCM mode power factor correction for LCD /Flat TV
• Server and PC Power Supplies
• AC Adapters and other Off-line SMPS
• Telecom Rectifiers