FAN7621B Fairchild Semiconductor, FAN7621B Datasheet

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FAN7621B

Manufacturer Part Number
FAN7621B
Description
The FAN7621B is a pulse frequency modulation controller for high-efficiency half-bridge resonant converters
Manufacturer
Fairchild Semiconductor
Datasheet

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© 2009 Fairchild Semiconductor Corporation
FAN7621B • Rev. 1.0.1
FAN7621B
PFM Controller for Half-Bridge Resonant Converters
Features
Applications
Ordering Information
FAN7621BSJX
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)
PDP and LCD TVs
Desktop PCs and Servers
Adapters
Telecom Power Supplies
Video Game Consoles
Part Number
FAN7621BSJ
Operating Junction
Temperature
-40°C ~ 130°C
16-Lead Small Outline Package (SOP)
Description
The FAN7621B is a pulse frequency modulation
controller
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
immunity.
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 (FPS
Package
for
Using
stable
high-efficiency
the
operation
zero-voltage-switching
with
half-bridge
excellent
Tape & Reel
Packaging
www.fairchildsemi.com
Method
Tube
July 2010
TM
resonant
)
(ZVS)
noise

Related parts for FAN7621B

FAN7621B Summary of contents

Page 1

... 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 — ...

Page 2

... CTC REF I CTC 2I CTC OLP CON 6 - 0 OLP OVP © 2009 Fairchild Semiconductor Corporation FAN7621B • Rev. 1.0 CON CTR sense 10 F/F - Time Delay 350ns Coun ter (1/4) ...

Page 3

... LO This is the low-side gate driving signal connection This pin is the power ground. This pin is connected to the source of the low-side MOSFET. © 2009 Fairchild Semiconductor Corporation FAN7621B • Rev. 1.0.1 ( (2) CTR (3) HO (4) NC FAN7621B ( (6) CON (7) NC ...

Page 4

... STG Note: 1. The maximum value of the recommended operating junction temperature is limited by thermal shutdown. Thermal Impedance Symbol θ Junction-to-Ambient Thermal Impedance JA © 2009 Fairchild Semiconductor Corporation FAN7621B • Rev. 1.0.1 =25°C unless otherwise specified. A Parameter Pin to Center Voltage 16-SOP (1) (1) Parameter 4 Min. ...

Page 5

... Low Level of High-Side Gate Driving V HOL Signal High Level of High-Side Gate Driving V LOH Signal (V -V LVCC LO Low Level of High-Side Gate Driving V LOL Signal © 2009 Fairchild Semiconductor Corporation FAN7621B • Rev. 1.0.1 Test Conditions CTR Supply Current (HV UV+) - 0.1V CC Supply Current (LV UV =100kHz, V ...

Page 6

... I SU Current Protection Latch Reset LV V PRSET Voltage Dead-Time Control Section D Dead Time T Note: 2. These parameters, although guaranteed, are not tested in production. © 2009 Fairchild Semiconductor Corporation FAN7621B • Rev. 1.0.1 (Continued) Test Conditions V =4V CON V > 3.5V CON LV > 21V CC (2) (2) (2) ...

Page 7

... Figure 4. Low-Side MOSFET Duty Cycle vs. Temperature 1.1 1.05 1 0.95 0.9 -50 - Temp ( Figure 6. High-Side V (HV CC 1.1 1.05 1 0.95 0.9 -50 - Temp ( Figure 8. Low-Side V ( © 2009 Fairchild Semiconductor Corporation FAN7621B • Rev. 1.0.1 =25ºC. A 1.1 1.05 0.95 0 100 O C) Figure 5. Switching Frequency vs. Temperature 1.1 1.05 1 0.95 0 100 C) ) Start vs. Temperature Figure 7. High-Side V CC 1.1 1.05 1 0.95 0 ...

Page 8

... Figure 10. OLP Delay Current vs. Temperature 1.1 1.05 1 0.95 0.9 -50 - Temp ( Figure 12. LV OVP Voltage vs. Temperature CC 1.1 1.05 1 0.95 0.9 -50 - Temp ( Figure 14. CON Pin Enable Voltage vs. Temperature © 2009 Fairchild Semiconductor Corporation FAN7621B • Rev. 1.0.1 (Continued) =25ºC. A 1.1 1.05 1 0.95 0 100 C) Figure 11. OLP Protection Voltage vs. Temperature 1.1 1.05 1 0.95 0 100 C) 1.1 1.05 1 0.95 0.9 ...

Page 9

... Functional Description 1. Basic Operation: FAN7621B is designed to drive high-side and low-side MOSFETs complementarily with 50% duty cycle. A fixed dead time of 350ns is introduced between consecutive transitions, as shown in Figure 16. High-side MOSFET gate drive Low-side MOSFET gate drve Figure 16. MOSFETs Gate Drive Signal 2. Internal Oscillator: FAN7621B employs a current- controlled oscillator, as shown in Figure 17 ...

Page 10

... Control loop take over Remote On / Off: When an auxiliary power supply is used for standby, the main power stage using FAN7621B can be shut down by pulling down the control pin voltage, as shown in Figure 23. R1 and C1 are used to ensure soft-start when switching resumes. time Stop Switching ...

Page 11

... Auto-Restart Mode Protection: Once a fault condition is detected, switching is terminated and the MOSFETs remain off. When LV falls to the LV CC 10.0V, the protection is reset. FAN7621B resumes normal operation when LV reaches the start voltage of CC 12.5V. Latch-Mode Protection: Once triggered, switching is terminated and the gate output signals remain off ...

Page 12

... MOSFETs remain off. This protection has a shutdown time delay of 1.5µs to prevent premature shutdown during © 2009 Fairchild Semiconductor Corporation FAN7621B • Rev. 1.0.1 5.2 Abnormal Over-Current Protection: (AOCP): If the secondary rectifier diodes are shorted, large current with extremely high di/dt can flow through the MOSFET before OCP or OLP is triggered ...

Page 13

... In addition helpful to reduce the duty imbalance to make the loop configured between CON pin and opto- coupler as small as possible, as shown in the red line in Figure 28. © 2009 Fairchild Semiconductor Corporation FAN7621B • Rev. 1.0.1 pin are enclosed by the T 13 Figure 28. Example for Duty Balancing ...

Page 14

... Enhanced system reliability with various protection functions Vcc=16~ 20Vdc R109 R108 1M 10k R110 1M F101 R111 3.15A/250V 45k R104 5.1k C101 220uF/ 450V Vin=340~400Vdc U2 © 2009 Fairchild Semiconductor Corporation FAN7621B • Rev. 1.0.1 Input Voltage Range 390V DC (340~400V ) DC input) DC D101 R103 400k 1N4937 U5 JP5 R112 0 10k C105 U4 ...

Page 15

... N 10 → Primary-Side Inductance (L Primary-Side Effective Leakage (L For more detailed information regarding the transformer, visit contact sales@santronics-usa.com © 2009 Fairchild Semiconductor Corporation FAN7621B • Rev. 1.0.1 (Continued Figure 30. Transformer Construction Wire 0.08φ×88 (Litz Wire) 0.08φ×234 (Litz Wire) 0.08φ ...

Page 16

... Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/. © 2009 Fairchild Semiconductor Corporation FAN7621B • Rev. 1.0.1 Figure 31. 16-Lead Small Outline Package (SOP) 16 www.fairchildsemi.com ...

Page 17

... Fairchild Semiconductor Corporation FAN7621B • Rev. 1.0.1 17 www.fairchildsemi.com ...

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