FAN6755W Fairchild Semiconductor, FAN6755W Datasheet

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FAN6755W

Manufacturer Part Number
FAN6755W
Description
This highly integrated PWM controller provides several features to enhance the performance of flyback converters
Manufacturer
Fairchild Semiconductor
Datasheet

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© 2009 Fairchild Semiconductor Corporation
FAN6755W / FAN6755UW • Rev. 1.0.5
FAN6755W / FAN6755UW
mWSaver
Features
Applications
General-purpose switched-mode power supplies and
flyback power converters, including:
ENERGY STAR® is a registered trademark of the U.S. Department of Energy and the U.S. Environmental Protection Agency.
mWSaver
Class Standby Power
Proprietary Asynchronous Frequency Hopping
Reduced EMI
Fixed PWM Frequency: 65KHz (FAN6755W),
130KHz (FAN6755UW)
Internal Leading-Edge Blanking
Built-in Synchronized Slope Compensation
Auto-Restart Protection: Feedback Open-Loop
Protection (OLP), V
(OVP), Over-Temperature Protection (OTP), and
Line Over-Voltage Protection
Soft Gate Drive with Clamped Output Voltage: 18V
V
Programmable Constant Power Limit (Full AC
Input Range)
Internal OTP Sensor with Hysteresis
Build-in 5ms Soft-Start Function
Input Voltage Sensing (V
Protection with Hysteresis and Line Over-Voltage
Protection
LCD Monitor Power Supply
Open-Frame SMPS
o <100mW at 25mW Load for LCDM Adaptor
o Internal High-Voltage JFET Startup
o Low Operating Current Maximum: 2mA
o Adaptive Decreasing of PWM Frequency to
o Feedback Impedance Switching During
DD
Under-Voltage Lockout (UVLO)
23KHz at Light-Load Condition, Improved
Light-Load Efficiency
Minimum Load or No Load
Technology Provides Industry’s Best-in-
DD
PWM Controller
Over-Voltage Protection
IN
Pin) for Brown-In/Out
Description
This highly integrated PWM controller provides several
features to enhance the performance of flyback
converters.
To minimize standby power consumption, a proprietary
adaptive
frequency at light-load condition. To avoid acoustic-
noise problems, the minimum PWM frequency is set
above 23kHz. This green-mode function enables the
power supply to meet international power conservation
requirements, such as Energy Star
high-voltage startup circuitry, the power loss caused by
bleeding resistors is also eliminated. To further reduce
power consumption, FAN6755W/UW uses the BiCMOS
process, which allows an operating current of only 2mA.
The standby power consumption can be under 100mW
for most of LCD monitor power supply designs.
FAN6755W/UW integrates a frequency-hopping function
that reduces EMI emission of a power supply with
minimum line filters. Its built-in synchronized slope
compensation achieves a stable peak-current-mode
control and improves noise immunity. The proprietary,
external line compensation ensures constant output
power limit over a wide AC input voltage range from
90V
FAN6755W/UW provides many protection functions.
The internal feedback open-loop protection circuit
protects the power supply from open feedback loop
condition or output short condition. It also has line
under-voltage protection (brownout protection) and over-
voltage protection using an input voltage sensing pin
(V
FAN6755W/UW is available in a 7-pin SOP package.
IN
).
AC
to 264V
green-mode
AC
.
function
reduces
®
. With the internal
June 2011
www.fairchildsemi.com
switching

FAN6755W Summary of contents

Page 1

... It also has line under-voltage protection (brownout protection) and over- voltage protection using an input voltage sensing pin ( Pin) for Brown-In/Out FAN6755W/UW is available in a 7-pin SOP package. green-mode function reduces ® . With the internal to 264V . ...

Page 2

... Part Number Temperature Range -40 to +105°C 7-Lead, Small Outline Integrated Circuit FAN6755WMY FAN6755UWMY -40 to +105°C Application Diagram © 2009 Fairchild Semiconductor Corporation FAN6755W / FAN6755UW • Rev. 1.0.5 Package (SOIC), Depopulated JEDEC MS-112, .150 Inch Body Figure 1. Typical Application 2 PWM Packing ...

Page 3

... UVLO V DD-OVP IN_ON IN_OFF VIN 1 High/Low Line Compensation 5.3V Marking Information 7 ZXYTT 6755 WTPM © 2009 Fairchild Semiconductor Corporation FAN6755W / FAN6755UW • Rev. 1.0.5 Re-start Protection Brownout Protection Clock Generator S Q … R Internal BIAS Soft-Start Comparator Green Mode Current Limit Comparator OTP ...

Page 4

... Power supply. The internal protection circuit disables PWM output as long VDD OVP trigger point For startup, this pin is pulled HIGH to the line input or bulk capacitor via resistors. © 2009 Fairchild Semiconductor Corporation FAN6755W / FAN6755UW • Rev. 1.0.5 SOP-7 VIN SENSE ...

Page 5

... All voltage values, except differential voltages, are given with respect to the network ground terminal. 2. Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. 3. ESD with HV pin: CDM=2000V (FAN6755W) or 1500V (FAN6755UW), and HBM=3500V. © 2009 Fairchild Semiconductor Corporation FAN6755W / FAN6755UW • Rev. 1.0.5 Parameter (1, 2) < ...

Page 6

... DD-OVP DD V Over-Voltage Protection DD t D-VDDOVP Debounce Time HV Section I Supply Current Drawn from HV Pin HV I Leakage Current after Startup HV-LC © 2009 Fairchild Semiconductor Corporation FAN6755W / FAN6755UW • Rev. 1.0.5 Conditions Full Load V – 0.16V DD-ON V =15V, GATE Open DD V +0.1V TH-OLP for =120V, V =10µ ...

Page 7

... TH-P Threshold Voltage for Current Limit V = Delay to Output PD t Leading-Edge Blanking Time LEB t Period During Soft-Start Time SS © 2009 Fairchild Semiconductor Corporation FAN6755W / FAN6755UW • Rev. 1.0.5 Conditions FAN6755W Center Frequency FAN6755UW FAN6755W Hopping Range FAN6755UW DD V =11V to 22V DD T =-40 to 85C=T ...

Page 8

... Green-Mode Entry FB Voltage FB-N V Green-Mode Ending FB Voltage FB-G FB Threshold Voltage for Zero-Duty V FB-ZDCR Recovery V FB Threshold Voltage for Zero-Duty FB-ZDC V FB-ZDCR - ZDC Hysterisis V FB-ZDC © 2009 Fairchild Semiconductor Corporation FAN6755W / FAN6755UW • Rev. 1.0.5 Conditions Min. 1/4 Pin Open 5.1 4.4 45.0 2.8 1.6 1.4 0.12 Figure 7. V vs. PWM Frequency ...

Page 9

... When activated, the output is disabled and the latch is turned off. 5. The threshold temperature for enabling the output again and resetting the latch after over-temperature protection has been activated. 6. These parameters are guaranteed by design. © 2009 Fairchild Semiconductor Corporation FAN6755W / FAN6755UW • Rev. 1.0.5 Conditions V =15V, I =50mA DD O ...

Page 10

... Figure 8. Startup Current (I Figure 10. Start Threshold Voltage (V vs. Temperature Figure 12. Supply Current Drawn from HV Pin (I vs. Temperature Figure 14. Frequency in Normal Mode (f vs. Temperature © 2009 Fairchild Semiconductor Corporation FAN6755W / FAN6755UW • Rev. 1.0.5 Figure 9. Operation Supply Current (I ) vs. Temperature DD-ST ) Figure 11. Minimum Operating Voltage (V DD-ON ) Figure 13 ...

Page 11

... Figure 16. FB Open-Loop Trigger Level (V vs. Temperature Figure 18. PWM Turn-Off Threshold Voltage (V & vs. Temperature IN-OFF IN-ON Figure 20 © 2009 Fairchild Semiconductor Corporation FAN6755W / FAN6755UW • Rev. 1.0.5 ) Figure 17. Delay Time of FB Pin Open-Loop Protection FB-OLP Figure 19. V vs. V LIMIT vs. Temperature D-OLP ...

Page 12

... DD UVLO hysteresis window ensures that the hold-up capacitor is adequate to supply V © 2009 Fairchild Semiconductor Corporation FAN6755W / FAN6755UW • Rev. 1.0.5 Gate Output / Soft Driving The BiCMOS output stage is a fast totem-pole gate driver. Cross conduction has been avoided to minimize heat dissipation, increase efficiency, and enhance reliability ...

Page 13

... The thermal sensor turns internal circuitry on again after the IC’s junction temperature drops by 25C. Thermal overload protection is designed to protect the FAN6755W/UW in the event of a fault condition. For continual operation, do not exceed the absolute maximum junction temperature +150 ...

Page 14

... Applications Information F1 N1 N1A R1 CN1 N28 Figure 22. © 2009 Fairchild Semiconductor Corporation FAN6755W / FAN6755UW • Rev. 1.0.5 N2 BD1 ZD1 C11 D3 + R14 VIN N7 C12 R13 N30 N10 1 N9 R10 R11 D2 N29 R15 ...

Page 15

... FR107 D4 FR103 D5 FYP1010 ZD1 P6KE150A F1 FUSE 4A/250V 13mH L2 Inductor (2µH) L3 Inductor (2µH) © 2009 Fairchild Semiconductor Corporation FAN6755W / FAN6755UW • Rev. 1.0.5 Part Type Designator R4, R5, R6, R7 R8, R17, R25, R27 R9 R10 R11 R12 R13 R14 R15 R16 R18 ...

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 FAN6755W / FAN6755UW • Rev. 1.0.5 A 0.65TYP ...

Page 17

... Fairchild Semiconductor Corporation FAN6755W / FAN6755UW • Rev. 1.0.5 17 www.fairchildsemi.com ...

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