■ Variable Frequency Control with 50% Duty Cycle for Half-bridge Resonant Converter Topology
■High Efficiency through Zero Voltage Switching(ZVS)
■Fixed Dead Time(350ns)
■Up to 300kHz Operating Frequency "Pulse Skipping for Frequency Limit(Programmable) at Light-Load Condition
■ Remote On/Off Control Using CON Pin
■Protection Functions: Over-Voltage Protection(OVP), Overload Protection (OLP), Over-Current Protection(OCP), Abnormal Over-Current Protection (AOCP), Internal Thermal Shutdown(TSD)
Applications
■PDP and LCD TVs
■Desktop PCs and Servers
■Adapters
■Telecom Power Supplies
■Video Game Consoles
Description
The FAN7621 is a pulse frequency modulation controller for high-efficiency half-bridge resonant converters.
Offering everything necessary to build a reliable and robust resonant converter, the FAN7621 simplifies designs and improves productivity, while improving performance. The FAN7621 includes a high-side gate-drive circuit, an accurate current controlled oscillator, frequency limit circuit, soft-start, and built-in protection functions.
The high-side gate-drive circuit has a common-mode noise cancellation capability, which guarantees stable operation with excellent noise immunity. Using the zero-voltage-switching (ZVS)technique dramatically reduces the switching losses and efficiency is significantly improved.
The ZVS also reduces the switching noise noticeably, which allows a small-sized Electromagnetic Interference(EMI) filter.
The FAN7621 can be applied to various resonant converter topologies; such as series resonant, parallel resonant, and LLC resonant converters.
(Picture:Pinout / Diagram)
