FAN6756 Fairchild Semiconductor, FAN6756 Datasheet

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FAN6756

Manufacturer Part Number
FAN6756
Description
Manufacturer
Fairchild Semiconductor
Datasheet

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© 2011 Fairchild Semiconductor Corporation
FAN6756 • Rev. 1.0.4
FAN6756 — mWSaver™ PWM Controller
Features
Ordering Information
Note:
1.
FAN6756MRMY
FAN6756MLMY
Part Number
Single-Ended Topologies, such as Flyback and
Forward Converters
mWSaver™ Technology
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Highly Integrated with Rich Features
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Advanced Protections
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A/R = Auto Recovery Mode protection, L = Latch Mode protection.
Achieves Low No-Load Power Consumption:
Less than 30mW at 230V
Included)
Eliminates X Capacitor Discharge Resistor Loss
with AX-CAP™ Technology
Linearly Decreases Switching Frequency to
23KHz
Burst Mode Operation at Light-Load Condition
Impedance Modulation in Standby Mode for
“Deep” Burst Mode Operation
Low Operating Current (450µA) in Standby Mode
500V High-Voltage JFET Startup Circuit to
Eliminate Startup Resistor Loss
Proprietary Asynchronous-Jitter to Reduce EMI
High-Voltage Sampling to Detect Input Voltage
Peak-Current-Mode Control with Slope
Compensation
Cycle-by-Cycle Current Limiting with Line
Compensation
Leading Edge Blanking (LEB)
Built-In 8ms Soft-Start
Brown-In/Brownout Recovery
Internal Overload/Open-Loop Protection (OLP)
V
V
Over-Temperature Protection (OTP)
Current-Sense Short-Circuit Protection (SSCP)
DD
DD
Under-Voltage Lockout (UVLO)
Over-Voltage Protection (V
OLP OVP
A/R
L
Protections
L
L
AC
OTP SSCP
(EMI Filter Loss
L
L
DD
(1)
OVP)
A/R
A/R
Temperature Range
-40 to +105°C
Operating
Description
The FAN6756 is a next-generation Green Mode PWM
controller with innovative mWSaver™ technology, which
dramatically reduces standby and no-load power
consumption,
Standby Mode efficiency guidelines.
An innovative AX-CAP™ method minimizes losses in
the EMI filter stage by eliminating the X-cap discharge
resistors
requirements. Standby Mode clamps feedback voltage
and modulates feedback impedance with a impedance
modulator during Burst Mode operation, which forces
the system to operate in a “deep” Burst Mode with
minimum switching losses.
Protections ensure safe operation of power system in
various abnormal conditions. Proprietary asynchronous
jitter decreases EMI emission and built-in synchronized
slope compensation allows more stable Peak-Current-
Mode control over wide range of input voltage and load
conditions. The proprietary internal line compensation
ensures constant output power limit over entire
universal line voltage range.
Requiring a minimum number of external components,
FAN6756 provides a basic platform that is well suited for
cost-effective flyback converter designs that require
extremely low standby power consumption.
Applications
Flyback power supplies that demand extremely low
standby power consumption, such as:
1
Adapters for Notebooks, Printers, Game Consoles,
etc.
Open-Frame SMPS for LCD TV, LCD Monitors,
Printer Power, etc.
while
enabling
8-Pin, Small Outline
Package (SOP)
Package
meeting
conformance
IEC61010-1
November 2011
Tape & Reel
to
Packing
www.fairchildsemi.com
Method
worldwide
safety

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FAN6756 Summary of contents

Page 1

... The proprietary internal line compensation ensures constant output power limit over entire universal line voltage range. Requiring a minimum number of external components, FAN6756 provides a basic platform that is well suited for cost-effective flyback converter designs that require extremely low standby power consumption. Applications ...

Page 2

... Startup VDD 7 UVLO V / DD-ON V RESTART V DD-OVP RTTH1 V RTTH2 © 2011 Fairchild Semiconductor Corporation FAN6756 • Rev. 1.0.4 Figure 1. Typical Application Diagram VDDOVP Latch OTP Protection OLP for ML Brownout Function High/Low Line Compensation V Limit Internal S Q BIAS R OSC Comparator Pattern Generator ...

Page 3

... Gate Drive Output. The totem-pole output driver for the power MOSFET; internally limited to 8 GATE V GATE-CLAMP © 2011 Fairchild Semiconductor Corporation FAN6756 • Rev. 1.0.4 ZXYTT 6756MR TPM Figure 3. Top Mark SOP-8 GND 1 ...

Page 4

... Fairchild does not recommend exceeding them or designing to Absolute Maximum Ratings. Symbol Parameter R Resistance on HV Pin HV © 2011 Fairchild Semiconductor Corporation FAN6756 • Rev. 1.0.4 Parameter (2,3) =50°C) A All Pins Except HV Pin All Pins Except HV Pin Min. ...

Page 5

... Internal Sink Current from V I DD-OLP V in Protection Mode DD-OLP Threshold Voltage for V V DD-OVP Voltage Protection V Over-Voltage Protection DD t D-VDDOVP Debounce Time © 2011 Fairchild Semiconductor Corporation FAN6756 • Rev. 1.0.4 Condition Limited by V OVP DD V Rising DD V Falling DD V Falling DD V Falling DD ...

Page 6

... V FB-ZDCR1 Cycle Recovery Threshold Voltage for Zero Duty V FB-ZDC2 Cycle in Standby Mode Threshold Voltage for Zero-Duty V FB-ZDCR2 Cycle Recovery in Standby Mode © 2011 Fairchild Semiconductor Corporation FAN6756 • Rev. 1.0.4 (Continued) Condition V =90V (V =120V = Source Series R=200kΩ Pin DC Source Series R=200kΩ ...

Page 7

... × √ When activated, the output is disabled and the controller is latched. 7. The threshold temperature to unlatch and restart output after OTP. © 2011 Fairchild Semiconductor Corporation FAN6756 • Rev. 1.0.4 (Continued) Condition V =122V, Series DC R=200kΩ =366V, Series DC R=200kΩ ...

Page 8

... Figure 6. Startup Current (I Figure 8. Start Threshold Voltage (V vs. Temperature Figure 10. Supply Current Drawn from HV Pin (I vs. Temperature Figure 12. Frequency in Normal Mode (f vs. Temperature © 2011 Fairchild Semiconductor Corporation FAN6756 • Rev. 1.0.4 Figure 7. Operation Supply Current (I ) vs. Temperature DD-ST ) Figure 9. Minimum Operating Voltage (V DD-ON ) Figure 11 ...

Page 9

... Over-Voltage Protection (V DD vs. Temperature Figure 18. Over-Temperature Protection Threshold Voltage (V ) vs. Temperature RTTH1 Figure 20. Brown-In (V AC-ON © 2011 Fairchild Semiconductor Corporation FAN6756 • Rev. 1.0.4 (Continued) ) Figure 15. Delay Time of FB Pin Open-Loop Protection FB-OLP ) Figure 17. Output Current from RT Pin (I DD-OVP Figure 19. Over-Temperature Protection Threshold ) vs. Temperature Figure 21 ...

Page 10

... To prevent entering Standby Mode during dynamic load change, there is 900ms delay. If there are more than 104 consecutive switching pulses during the 900ms delay, FAN6756 does not go into Standby Mode. Once FAN6756 enters Standby Mode, the feedback impedance, Z modulator, as shown in Figure 26. When V ...

Page 11

... FAN6756 exits Standby Mode after more than 104 consecutive switching pulses in deep Burst Mode. Once FAN6756 exits Standby Mode, the feedback impedance is modulated to 8.5k ...

Page 12

... High/Low Line Compensation for Constant Power Limit FAN6756 has pulse-by-pulse current limit as shown in Figure 29, which limits the maximum input power with a given input voltage. If the output consumes beyond this maximum power, the output voltage drops, triggering the overload protection ...

Page 13

... The OTP can be trigged by pulling down the RT pin voltage using an opto-coupler or transistor. Once V less than V (0.7V) for longer than t RTTH2 the protection is triggered and FAN6756 enters Latch Mode protection. When OTP is not used recommended to place a 100kΩ resistor between this pin and ground to prevent noise interference. ...

Page 14

... Typical Application Circuit Application 65W Notebook Adapter © 2011 Fairchild Semiconductor Corporation FAN6756 • Rev. 1.0.4 PWM Controller Input Voltage Range FAN6756 Figure 34. Schematic of Typical Application Circuit 14 Output 85V ~ 265V 19V/3.42A AC AC www.fairchildsemi.com ...

Page 15

... Insulation: Polyester Tape t = 0.025mm, 3-Layer N4 5 → 6 Insulation: Polyester Tape t = 0.025mm, 3-Layer Electrical Characteristics Primary-Side Inductance Primary-Side Effective Leakage Inductance © 2011 Fairchild Semiconductor Corporation FAN6756 • Rev. 1.0.4 Figure 35. Transformer Specification Wire Turns Winding Method 0.5φ×1 19 Solenoid Winding 0.9φ×1 ...

Page 16

... Typical Performance Power Consumption Input Voltage Output Power No Load 230V 0.25W AC 0.5W Efficiency Output Power 16.25W 115V/ 60Hz 88.48% 230V/ 60Hz 88.00% © 2011 Fairchild Semiconductor Corporation FAN6756 • Rev. 1.0.4 Actual Output Power Input Power 0W 0.024W 0.232W 0.339W 0.495W 0.643W 32.5W 48.75W 88.58% 87.45% 87.89% 87.92% 16 Specification Input Power < 0.03W Input Power < ...

Page 17

... 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/. © 2011 Fairchild Semiconductor Corporation FAN6756 • Rev. 1.0.4 5.00 4.80 A 3.81 ...

Page 18

... Fairchild Semiconductor Corporation FAN6756 • Rev. 1.0.4 18 www.fairchildsemi.com ...

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