FAN6204 Fairchild Semiconductor, FAN6204 Datasheet

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FAN6204

Manufacturer Part Number
FAN6204
Description
FAN6204 is a secondary-side synchronous rectification (SR) controller to drive SR MOSFET for improving efficiency
Manufacturer
Fairchild Semiconductor
Datasheet

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© 2010 Fairchild Semiconductor Corporation
FAN6204 • Rev. 1.0.1
FAN6204
mWSaver™ Synchronous Rectification Controller for
Flyback and Forward Freewheeling Rectification
Features
Applications
Ordering Information
Part Number
FAN6204MY
mWSaver™ Technology:
-
-
SR Controller
Suited for Flyback Converter in QR, DCM, and
CCM Operation
Suited for Forward Freewheeling Rectification
PWM Frequency Tracking with Secondary-Side
Winding Voltage Detection
Ultra-Low V
Voltage Applications (5V~24V)
V
12V (Typical) Gate Driver Clamp
8-Pin SOP Package
AC/DC NB Adapters
Open-Frame SMPS
Battery Charger
DD
Pin Over-Voltage Protection (OVP)
Internal Green Mode to Stop SR Switching for
Lower No-Load Power Consumption
1.1mA Ultra-Low Green Mode Operating
Current
DD
Operating Voltage for Various Output
Temperature Range
-40°C to +105°C
Operating
8-Pin, Small Outline Package (SOP)
Description
FAN6204 is a secondary-side synchronous rectification
(SR) controller to drive SR MOSFET for improving
efficiency. The IC is suitable for flyback converters and
forward free-wheeling rectification.
FAN6204 can be applied in continuous or discontinuous
conduction mode (CCM and DCM) and quasi-resonant
(QR) flyback converters based on the proprietary
innovative linear-predict timing-control technique. The
benefits of this technique include a simple control
method without current-sense circuitry to accomplish
noise immunity.
With PWM frequency tracking and secondary-side
winding voltage detection, FAN6204 can operate in both
fixed- and variable-frequency systems.
In Green Mode, the SR controller stops all SR switching
operation to reduce the operating current. Power
consumption is maintained at minimum level in light-
load condition.
Package
Packing Method
Tape & Reel
October 2011
www.fairchildsemi.com

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FAN6204 Summary of contents

Page 1

... FAN6204 is a secondary-side synchronous rectification (SR) controller to drive SR MOSFET for improving efficiency. The IC is suitable for flyback converters and forward free-wheeling rectification. FAN6204 can be applied in continuous or discontinuous conduction mode (CCM and DCM) and quasi-resonant (QR) flyback converters based on the proprietary innovative linear-predict timing-control technique. The ...

Page 2

... Application Diagrams Figure 1. Typical Application Circuit for Flyback Converter Internal Block Diagram © 2010 Fairchild Semiconductor Corporation FAN6204 • Rev. 1.0.1 Figure 2. Typical Application Circuit for Forward Freewheeling Rectification Figure 3. Functional Block Diagram 2 www.fairchildsemi.com ...

Page 3

... An internal current source RES RES pin. Winding Detection. This pin is used to detect the voltage on the winding during the on-time 8 LPC period of the primary GATE. © 2010 Fairchild Semiconductor Corporation FAN6204 • Rev. 1.0.1 : Fairchild Logo Z: Plant Code X: Year Code Y: Week Code TT: ...

Page 4

... The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not recommend exceeding them or designing to Absolute Maximum Ratings. Symbol Parameter T Operating Ambient Temperature A © 2010 Fairchild Semiconductor Corporation FAN6204 • Rev. 1.0.1 =25° Min. Max. 30 -0.3 7 ...

Page 5

... SR Enable Threshold Clamp V EN-CLAMP Voltage Threshold Voltage on LPC Rising V LPC-TH-HIGH Edge Blanking Time LPC is HIGH t BNK-DIS During SR Gate Turn-On Period © 2010 Fairchild Semiconductor Corporation FAN6204 • Rev. 1.0.1 =4.5V~25V and T =-40°C ~ 105°C. A Conditions V =15V, L =50KHz, MOSFET =6000pF ISS ...

Page 6

... DEAD-RE-CFR Internal Over-Temperature Protection Section T Internal Threshold Temperature for OTP OTP T Hysteresis Temperature for Internal OTP OTP-HYST Note: 3. Guaranteed by design. © 2010 Fairchild Semiconductor Corporation FAN6204 • Rev. 1.0.1 =4.5V~25V and T =-40°C ~ 105°C. A Conditions (3) LPC-EN to Enable SR MOS RES (3) V =1.5V ...

Page 7

... Typical Performance Characteristics These characteristic graphs are normalized at T Figure 6. Turn-On Threshold Voltage Figure 8. Startup Current Figure 10. Operating Current in Green Mode © 2010 Fairchild Semiconductor Corporation FAN6204 • Rev. 1.0.1 =25°C. A Figure 7. Turn-Off Threshold Voltage Figure 9. Operating Current Figure 11. Gate Output Clamping Voltage 7 www ...

Page 8

... Typical Performance Characteristics These characteristic graphs are normalized at T Figure 12. LPC Source Current Figure 14. Threshold Voltage of V Figure 16. Minimum LPC Enable Time © 2010 Fairchild Semiconductor Corporation FAN6204 • Rev. 1.0.1 (Continued) =25°C. A Figure 13. LPC Lower Clamp Voltage Figure 15. Ratio between LPC and RES RES Figure 17 ...

Page 9

... PM,ON discharge time. © 2010 Fairchild Semiconductor Corporation FAN6204 • Rev. 1.0.1 FAN6204 uses the LPC and RES pins with two sets of voltage dividers to sense DET voltage (V voltage (V can be obtained result MOSFET, can be predicted by Equation 1. As shown in Figure 18, the SR MOSFET is turned on when the SR MOSFET body diode starts conducting and DET voltage drops to zero ...

Page 10

... If the discharge time of the internal timing capacitor is shorter than t and R should 1 2 for more than three cycles, the SR circuit enters Green Mode. Once FAN6204 enters Green Mode, the SR MOSFET stops switching and the major internal block is  V 0.3 (6) shut down to further reduce operating current of the SR OUT controller ...

Page 11

... S-PWM disabled and enters Green Mode, as shown in Figure 23. Since the rising edge of V © 2010 Fairchild Semiconductor Corporation FAN6204 • Rev. 1.0.1 periods (t accuracy of switching period is important. Therefore, if the detected switching period has a serious variation under some abnormal conditions, the SR gate should be terminated to prevent fault trigger ...

Page 12

... Under-Voltage Lockout (UVLO) The power ON and OFF V is higher than V LPC-DIS at 4.8V and 4.5V, respectively. With an ultra-low V , FAN6204 LPC-HIGH threshold voltage, the FAN6204 can be used in various output voltage applications. V Pin Over-Voltage Protection (OVP pulled to ground and Over-voltage conditions are usually caused by an open ...

Page 13

... 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/. © 2010 Fairchild Semiconductor Corporation FAN6204 • Rev. 1.0.1 5.00 4.80 A 3.81 ...

Page 14

... Fairchild Semiconductor Corporation FAN6204 • Rev. 1.0.1 14 www.fairchildsemi.com ...

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