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Critical Conduction Mode PFC Controller
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General Description
The SG6961 is an 8-pin boundary mode PFC controller IC intended for controlling PFC pre-regulators.
The SG6961 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 disables the controller if the output feedback loop is opened.
The start-up current is lower than 20ľA and the operating current is under 4.5mA.
The supply voltage can be up to 20V, maximizing application flexibility.
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Features
- Boundary Mode PFC Controller
- Low Input Current THD
- Controlled On-Time PWM
- Zero-Current Detection
- Cycle-by-Cycle Current Limiting
- Leading-Edge Blanking Instead of RC Filtering
- Low Start-up Current (10ľA Typical)
- Low Operating Current (4.5mA Typical)
- Feedback Open-Loop Protection
- Programmable Maximum On-Time (MOT)
- Output Over-Voltage Clamping Protection
- Clamped Gate Output Voltage 16.5V
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Applications
- Electric Lamp Ballasts
- AC-DC Switching Mode Power Converter
- Open-Frame Power Supplies and Power Adapters
- Flyback Power Converters with ZCS/ZVS
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