FAN7621B − Controller for Half-Bridge Resonant Converters

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 highside 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.

Download Datasheet Buy Products Request Free Samples

Product Status/Pricing/Packaging

Index	Product	Product & Eco Status	*Pricing	Packaging & Packing Info	**Package Marking Convention	Qualification Support	Compliance Certificates
2	FAN7621BN	Obsolete as of 17-Jun-2011 ROHS Compliant	N/A	MDIP 16L Details MDIP 16L Drawing RAIL	Line 1:$Y (Fairchild logo) &Z (Plant Code) &3 (3-Digit Date Code) &K	RTHETA (JA) : 110 °C/W Moisture Sensitivity Level (MSL) : NA Max Reflow Temp : 999	RoHS IPC1752 RoHS/REACH/JIG RoHS/REACH/JIG
0	FAN7621BSJX	Full Production ROHS Compliant	$0.84	SOP 16L Details SOP 16L Drawing TAPE REEL	Line 1:$Y (Fairchild logo) &Z (Plant Code) &2 (2-Digit Date Code) &K Line 2:FAN7621B	RTHETA (JA) : 110 °C/W Moisture Sensitivity Level (MSL) : 1 Max Reflow Temp : 260	RoHS IPC1752 RoHS/REACH/JIG RoHS/REACH/JIG
2	FAN7621BSJ	Obsolete as of 20-Jun-2012 ROHS Compliant	N/A	SOP 16L Details SOP 16L Drawing RAIL	Line 1:$Y (Fairchild logo) &Z (Plant Code) &2 (2-Digit Date Code) &K Line 2:FAN7621B	RTHETA (JA) : 110 °C/W Moisture Sensitivity Level (MSL) : 1 Max Reflow Temp : 260	RoHS IPC1752 RoHS/REACH/JIG RoHS/REACH/JIG

Show discontinued variants ...

Fairchild 1,000 piece Budgetary Pricing. *
If there is no sample button displayed at the top of the page, please contact one of the Fairchild distributors or your local sales office to obtain samples.
Top mark packaging information for product FAN7621B is available. **

Features

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 TV

LCD TV

Desktop PC

Server

Video Game Console

Application Notes

Application Note	Description
AN-6208	Secondary-Side Synchronous Rectifier (SR) for LLC Resonant Converter Using FAN6208(484 K) 15-Apr-2013
AN-4151	Half-Bridge LLC Resonant Converter Design Using FSFR-Series Fairchild Power Switch (FPS™)(1,113 K) 15-May-2012
AN-9738	Design Guideline on 150W Power Supply for LED Street Lighting Design Using FL7930B and FAN7621S(1,209 K) 20-Apr-2011
AN-4151SC	Half-Bridge LLC Resonant Converter Design Using FSFR-Series Fairchild Power Switch (FPS™) (Chinese Translation)(1,405 K) 20-Jul-2011

Videos

FSFR2100 - LLC Resonant Converter Solutions

FSFR2100 Demo - Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converters

View all videos

Reference Designs

Application	Document Number	Featured Products	Output Power	Input Voltage	Topology
Power Supply LCD TV	RD-324	FAN7621, FAN7621B, FAN7621S, FQPF8N60C, FQPF8N60CF, FYP2010DN	200W	340-400V/DC	LLC Resonant Half-Bridge Converter
PDP TV	RD-325	FAN7621, FAN7621B, FAN7621S	384W	340-400V_AC	LLC Resonant Half-Bridge Converter

Additional Resources

Design Tools Knowledgebase – Ask a Question Find a local sales office Product change notices (PCN) How to Buy Products or Order Samples


Thank you for providing us with feedback regarding the Fairchild website. Your feedback has been submitted to our web team and will be reviewed. You may be contacted in the event that we have follow-up questions about the feedback you have provided.