SG6961

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Critical Conduction Mode PFC Controller

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 startup current is lower than 20µA and the operating current is under 4.5mA. The supply voltage can be up to 20V, maximizing application flexibility.

Product Status/Pricing/Packing

Product Product Status Eco Status *Pricing Package Type Leads Packing Method Package Drawing **Package Marking Convention RoHS IPC1752 RoHS/REACH/JIG Certificate of Compliance
SG6961SZ Not recommended for new design Green as of Jan 2010 SO-8 8 TAPE REEL PDF Line 1:$Y (Fairchild logo)
&Z (Asm. Plant Code)
&2 (2-Digit Date Code) &K
Line 2:6961
Line 3:SZB
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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 Startup Current: 10µA (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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