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SG6961 — Critical Conduction Mode PFC Controller
June 2010
SG6961
Critical Conduction Mode PFC Controller
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 Startup Current: 10µA (Typical)
Low Operating Current: 4.5mA (Typical)
Feedback Open-Loop Protection
Programmable Maximum On-Time
Output Over-Voltage Clamping Protection
Clamped Gate Output Voltage 16.5V
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
startup current is lower than 20µA and the operating
current is under 4.5mA. The supply voltage can be up to
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