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FAN7621B fiches techniques PDF

Fairchild Semiconductor - PFM Controller

Numéro de référence FAN7621B
Description PFM Controller
Fabricant Fairchild Semiconductor 
Logo Fairchild Semiconductor 





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FAN7621B fiche technique
July 2010
FAN7621B
PFM Controller for Half-Bridge Resonant Converters
Features
ƒ Variable Frequency Control with 50% Duty Cycle
for Half-bridge Resonant Converter Topology
ƒ High Efficiency through Zero Voltage Switching (ZVS)
ƒ Fixed Dead Time (350ns)
ƒ Up to 300kHz Operating Frequency
ƒ Pulse Skipping for Frequency Limit (Programmable)
at Light-Load Condition
ƒ Remote On/Off Control using CON Pin
ƒ Protection Functions: Over-Voltage Protection
(OVP), Overload Protection (OLP), Over-Current
Protection (OCP), Abnormal Over-Current Protection
(AOCP), Internal Thermal Shutdown (TSD)
Applications
ƒ PDP and LCD TVs
ƒ Desktop PCs and Servers
ƒ Adapters
ƒ Telecom Power Supplies
ƒ Video Game Consoles
Description
The FAN7621B 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 FAN7621B
simplifies designs and improves productivity, while
improving performance. The FAN7621B 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 FAN7621B can be applied to various resonant
converter topologies; such as series resonant, parallel
resonant, and LLC resonant converters.
Related Resources
AN4151 — Half-bridge LLC Resonant Converter Design
using FSFR-series Fairchild Power Switch (FPSTM)
Ordering Information
Part Number
FAN7621BSJ
FAN7621BSJX
Operating Junction
Temperature
Package
-40°C ~ 130°C
16-Lead Small Outline Package (SOP)
Packaging
Method
Tube
Tape & Reel
www.DataSheet4U.com
© 2009 Fairchild Semiconductor Corporation
FAN7621B • Rev. 1.0.1
www.fairchildsemi.com

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