Datasheet FAN7621 Datasheet (Fairchild)

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Reference Design RD-325

Fairchild PFM Controller FAN7621 - 384W Design

Featured Device Application

FAN7621
FEP16FT/FET16FTA
FEP16BT/FET16BTA

FCPF11N60

PDP TV 340~400V

Input Voltage

Range

Output Voltage

(Rated Current)

DC

210V /1.4A

60V / 1.5A

Rated Output

Power

384W

Topology

LLC Resonant

Half-Bridge

Converter

Key Features

FAN7621

 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 Control Pin
 Various Protection Functions: Over-Voltage Protection (OVP), Overload Protection (OLP), Over-Current

Protection (OCP), Abnormal Over-Current Protection (AOCP), and Internal Thermal Shutdown (TSD)

FEP16FT

 300V/16A Ultra-Fast Recovery Rectifier, Common Cathode
 Low Forward-Voltage Drop: 1.3V at T

= 25oC, 8A

A

FEP16FTA

 300V/16A Ultra-Fast Recovery Rectifier, Common Anode
 Low Forward-Voltage Drop: 1.3V at T

FEP16BT

= 25oC, 8A

A

 100V/16A Ultra-Fast Recovery Rectifier, Common Cathode
 Low Forward-Voltage Drop: 0.95V at T

FEP16BTA

= 25oC, 8A

A

 100V/16A Ultra-Fast Recovery Rectifier, Common Anode
 Low Forward-Voltage Drop: 0.95V at T

FCPF11N60

= 25oC, 8A

A

 600V/11A SuperFET™
 Low Gate Charge: Typical: 40°C
 Low R

: 0.38Ω Max. at TA 25oC

DS,ON

© 2009 Fairchild Semiconductor Corporation 1 RD-325_FAN7621 • Rev. 0.0.1

www.fairchildsemi.com

1. Schematic

FAN7621

Figure 1. Schematic

© 2009 Fairchild Semiconductor Corporation 2 RD-325_FAN7621 • Rev. 0.0.1

www.fairchildsemi.com

2. Transformer

Figure 2. Transformer Schematic Diagram

2.1. Winding Specification

Pin (S → F) Wire Turns Winding Method

NS3 14 → 13 0.12φ×25 (Litz Wire) 2 Solenoid

Ns2 11 → 12 0.08φ×126 (Litz Wire) 8 Solenoid

Ns1 16 → 15 0.12φ×25 (Litz Wire) 19 Solenoid

NP 2 → 8 0.08φ×126 (Litz Wire) 28 Solenoid

Core: EED4244D (Ae=158 mm2)
Bobbin: EED4244D (Horizontal, 17Pins, 9/8 pins at each side)

2.2. Electrical Characteristics

Pin Specification Remark

Primary-Side Inductance (Lp)

Primary-Side Effective

Leakage Inductance (L

)

r

2－8

2－8

240μH ± 5%

40μH ± 10%

100kHz, 1V, All Other Pins Open

All Other Pins Shorted

© 2009 Fairchild Semiconductor Corporation 3 RD-325_FAN7621 • Rev. 0.0.1

www.fairchildsemi.com

3. Typical Characteristics

100%

340Vdc 380Vdc 400Vdc

95%

90%

85%

Efficiency (%)

80%

75%

70%

5% 10% 20% 25% 50% 75% 100%

Load (%)

Figure 3. Efficiency

4. Related Resources

FAN7621 — PFM Controller for Half-Bridge Resonant Converters
AN-4151 — Half-Bridge LLC Replacement Converter Design Using FSFR-Series Fairchild Power

Switches (FPS™)

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© 2009 Fairchild Semiconductor Corporation 4 RD-325_FAN7621 • Rev. 0.0.1