FAN7631 - Advanced Pulse Frequency Modulation Controller
Fairchild (now onsemi)
General Description
The FAN7631 is a pulse-frequency modulation controller for high-efficiency half-bridge resonant converters that includes a high-side gate drive circuit, an accurate current-controlled oscillator, and various protection functions.
Key Features
Variable Frequency Control with 50% Duty Cycle
for Half-Bridge Resonant Converter Topologies.
High Efficiency with Zero-Voltage-Switching (ZVS).
Up to 600kHz Operating Frequency.
Built-in High-Side Gate Driver.
High Gate-Driving Current: +500mA/-1000mA.
Programmable Dead Time with a Resistor.
Pulse Skipping and Burst Operation for Frequency
Limit (Programmable) at Light-Load Condition.
Simple Remote On/Off Control with Latch or
Auto-Restart (A/R) Using FI.
Full PDF Text Transcription for FAN7631 (Reference)
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FAN7631. For precise diagrams, and layout, please refer to the original PDF.
FAN7631 — Advanced PFM Controller for Half-Bridge Resonant Converters April 2012 FAN7631 Advanced Pulse Frequency Modulation (PFM) Controller for Half-Bridge Resonant Con...
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lse Frequency Modulation (PFM) Controller for Half-Bridge Resonant Converters Features Variable Frequency Control with 50% Duty Cycle for Half-Bridge Resonant Converter Topologies High Efficiency with Zero-Voltage-Switching (ZVS) Up to 600kHz Operating Frequency Built-in High-Side Gate Driver High Gate-Driving Current: +500mA/-1000mA Programmable Dead Time with a Resistor Pulse Skipping and Burst Operation for Frequency Limit (Programmable) at Light-Load Condition Simple Remote On/Off Control with Latch or Auto-Restart (A/R) Using FI or LS Pin Protection Functions: Over-Voltage Protection (OVP), Overload