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Technical content
Features
mWSaver™ Technology Provides Industry’s Best- in-Class Standby Power <100 mW at 25-mW Load for LCDM Adaptor Internal High-Voltage JFET Startup Low Operating Current: Under 2 mA Adaptively Decrease PWM Frequency to 23 kHz at Light-Load Condition for Better Efficiency Feedback Impedance Switching During Minimum Load or No Load Proprietary Asynchronous Frequency Hopping Technique that Reduces EMI Fixed PWM Frequency: 65 kHz (FAN6755W), 130 kHz (FAN6755UW) Internal Leading-Edge Blanking Built-in Synchronized Slope Compensation Auto-Restart Protection: Feedback Open-Loop Protection (OLP), VDD Over-Voltage Protection (OVP), Over-Temperature Protection (OTP), and Line Over-Voltage Protection Soft Gate Drive with Clamped Output Voltage: 18 V VDD Under-Voltage Lockout (UVLO) Programmable Constant Power Limit (Full AC Input Range) Internal OTP Sensor with Hysteresis Build-in 5-ms Soft-Start Function Input Voltage Sensing (VIN Pin) for Brown-In/Out Protection with Hysteresis and Line Over-Voltage Protection
Applications
General-purpose switched-mode power supplies and flyback power converters, including: LCD Monitor Power Supply Open-Frame SMPS
Description
This highly integrated PWM controller provides several features to enhance the performance of flyback converters. To minimize standby power consumption, a proprietary adaptive green -mode function reduces switching frequency at light -load condition. To avoid acoustic - noise problems, the minimum PWM frequency is set above 23 kHz. This green -mode function enables the power supply to meet international power conservation requirements, such as Energy Star ®. With the internal high-voltage startup circuitry, the power loss caused by bleeding resistor s is also elimin ated. To further reduce power consumption, FAN6755W/UW uses the BiCMOS process, which allows an operating current of only 2 mA. The standby power consumption c an be under 100 mW for most of LCD monitor power supply designs. FAN6755W/UW integrates a frequen cy-hopping function that reduce s EMI emission of a power supply with minimum line filters. The built-in synchronized slope compensation achieves a stable peak -current- mode control and improves noise immunity . The proprietary line compensation ensures const ant output power limit ove r a wide AC input voltage range from 90 VAC to 264 VAC. 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 (VIN). FAN6755W/UW is available in a 7-pin SOP package.
© 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN6755W / FAN6755UW • Rev. 1.0.7 2 FAN6755W / FAN6755UW — mWSaver™ Controller
Ordering Information
FAN6755WMY -40 to +105°C 7-Lead, Small Outline Integrated Circuit (SOIC), Depopulated JEDEC MS-112, .150 Inch Body 65 kHz Reel & Tape FAN6755UWMY -40 to +105°C 130 kHz Reel & Tape Application Diagram L N EMI Filter + + HV VDD FAN6755W 7 + FB VIN SENSE GATE Vo+ Vo- Figure 1. Typical Application
Figure 4. Pin Configuration (Top View)
1 VIN
VIN pin. It is suggested to add a low-pass filter to filter out line ripple on the bulk capacitor. Pulling VIN HIGH also triggers auto-restart protection. determined in response to the signal on this pin and the current -sense signal on the SENSE pin.
4 GND Ground
5 GATE The totem-pole output driver. Soft-driving waveform is implemented for improved EMI. 7 HV For startup, this pin is connected to the line input or bulk capacitor in series with resistors.
© 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN6755W / FAN6755UW • Rev. 1.0.7 5 FAN6755W / FAN6755UW — mWSaver™ Controller Absolute Maximum Ratings Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating condi tions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. Symbol Parameter Min. Max. Unit VVDD DC Supply Voltage(1, 2) 30 V VFB FB Pin Input Voltage -0.3 7.0 V VSENSE SENSE Pin Input Voltage -0.3 7.0 V VVIN VIN Pin Input Voltage -0.3 7.0 V VHV HV Pin Input Voltage 700 V PD Power Dissipation (TA＜50°C) 400 mW JA Thermal Resistance (Junction-to-Air) 150 C/W TJ Operating Junction Temperature -40 +125 C TSTG Storage Temperature Range -55 +150 C TL Lead Temperature (Wave Soldering or IR, 10 Seconds) +260 C ESD Human Body Model, JEDEC: JESD22-A114 All Pins Except HV Pin 5.5 kV Charged Device Model, JEDEC: JESD22-C101 All Pins Except HV Pin 2.0 Notes: 1. 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=2000 V (FAN6755W) or 1500 V (FAN6755UW), and HBM=3500 V.
© 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN6755W / FAN6755UW • Rev. 1.0.7 6 FAN6755W / FAN6755UW — mWSaver™ Controller
Electrical Characteristics
VDD=15 V, TA=25C, unless otherwise noted. Symbol Parameter Conditions Min. Typ. Max. Unit VDD Section VOP Continuously Operating Voltage Full Load 22 V VDD-ON Start Threshold Voltage 15 16 17 V VDD-OFF Protection Mode 9 10 11 V UVLO Normal Mode 6.8 7.8 8.8 V IDD-ST Startup Current VDD-ON – 0.16 V 30 µA IDD-OP Operating Supply Current VDD=15 V, GATE Open 2 mA IDD-OLP Internal Sink Current VDD-OLP+0.1 V 30 60 90 µA VDD-OLP Threshold Voltage on VDD for HV JFET Turn-On 6.5 7.5 8.0 V VDD-OVP VDD Over-Voltage Protection 25 26 27 V tD-VDDOVP VDD Over-Voltage Protection Debounce Time 75 125 200 µs HV Section IHV Supply Current Drawn from HV Pin VDC=120 V, VDD=10 µF, VDD=0 V 2.0 3.5 5.0 mA IHV-LC Leakage Current after Startup HV=700 V, VDD=VDD- OFF+1 V 1 20 µA VDD-ON VDD UVLO t Normal Mode VDD-ON VDD VDD-OFF t VDD-OLP Protection Mode Figure 5. VDD Behavior
© 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN6755W / FAN6755UW • Rev. 1.0.7 7 FAN6755W / FAN6755UW — mWSaver™ Controller VDD=15 V, TA=25C, unless otherwise noted. Symbol Parameter Conditions Min. Typ. Max. Unit Oscillator Section fOSC Frequency in Normal Mode Center Frequency FAN6755W 62 65 68 kHz FAN6755UW 124 130 136 Hopping Range FAN6755UW ±9 ±10.4 ±11.8 fOSC-G Green-Mode Frequency 20 23 26 kHz tHOP Hopping Period 10 12 14 ms fDV Frequency Variation vs. VDD Deviation VDD=11 V to 22 V 5 % fDT Frequency Variation vs. Temperature Deviation TA=-40 to 85C=TJ 5 % VIN Section VIN-OFF PWM Turn-Off (Brown-out) Threshold Voltage 0.66 0.70 0.74 V VIN-ON PWM Turn-On (Brown in) Threshold Voltage VIN-OFF+ 0.17 VIN-OFF+ 0.20 VIN-OFF+ 0.23 V VIN-Protect Threshold Voltage of VIN Over- Voltage Protection 5.1 5.3 5.5 V tVIN-Protect Debounce Time of VIN Over- Voltage Protection 60 100 140 µs Current-Sense Section VLIMIT at VIN=1 V Threshold Voltage for Current Limit VIN=1 V 0.80 0.83 0.86 V VLIMIT at VIN=3 V Threshold Voltage for Current Limit VIN=3 V 0.67 0.70 0.73 V tPD Delay to Output 100 200 ns tLEB Leading-Edge Blanking Time Soft-Start (FAN6755UW) 125 150 175 ns Steady State 240 290 340 tSS Period During Soft-Start Time Startup Time 4.0 5.5 7.0 ms VLimit VIN VIN-OFF VIN-Protect =3VVINVIN=1V VSENSE =0.83V VSENSE =0.7V =0.92V =5.3V Figure 6. VIN vs. VSENSE
© 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN6755W / FAN6755UW • Rev. 1.0.7 8 FAN6755W / FAN6755UW — mWSaver™ Controller VDD=15 V, TA=25C, unless otherwise noted. Symbol Parameter Conditions Min. Typ. Max. Unit Feedback Input Section AV Internal FB Voltage Attenuation 1/4.5 1/4.0 1/3.5 V/V ZFB Input Impedance VFB=4 V 10 15 19 kΩ VFB-OPEN The Maximum Clamp of FB Voltage FB Pin Open 5.1 5.3 5.5 V VFB-OLP FB Open-Loop Protection Triggering Level 4.4 4.6 4.8 V tD-OLP Delay Time of FB Pin Open-loop Protection 45.0 62.5 70.0 ms VFB-N Green-Mode Entry FB Voltage 2.8 3.0 3.2 V VFB-G Green-Mode Ending FB Voltage VFB-N - 0.6 V VFB-ZDCR FB Threshold Voltage for Zero-Duty Recovery 1.6 1.8 2.0 V VFB-ZDC FB Threshold Voltage for Zero-Duty 1.4 1.6 1.8 V VFB-ZDCR - VFB-ZDC ZDC Hysteresis 0.12 0.15 0.19 V fOSC fOSC-G VV FB-NFB-G FBV Frequency PWM Frequency FB-ZDCV FB-ZDCRV + hopping range - hopping range +1.76KHz -1.76KHz Figure 7. VFB vs. PWM Frequency
© 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN6755W / FAN6755UW • Rev. 1.0.7 9 FAN6755W / FAN6755UW — mWSaver™ Controller VDD=15 V, TA=25C, unless otherwise noted. Symbol Parameter Conditions Min. Typ. Max. Unit GATE Section DCYMAX Maximum Duty Cycle 60 75 90 % VGATE-L Gate Low Voltage VDD=15 V, IO=50 mA 1.5 V VGATE-H Gate High Voltage VDD=12 V, IO=50 mA 8 V tr Gate Rising Time VDD=15 V, CL=1 nF 100 ns tf Gate Falling Time VDD=15 V, CL=1 nF 30 ns IGATE- SOURCE Gate Source Current VDD=15 V, GATE=6 V 700 mA VGATE- CLAMP Gate Output Clamping Voltage VDD=22 V 18 V Over-Temperature Protection Section (OTP) TOTP Protection Junction Temperature(4,6) 140 °C TRestart Restart Junction Temperature(5,6) TOTP-25 °C Notes: 4. When OTP is activated, the PWM switching is shut down. 5. When junction temperature is lower than this level, IC resumes PWM switching. 6. These parameters are guaranteed by design.
requirement of VDD hold-up capacitance. minimum green-mode frequency of around 23 kHz. delivered from auxiliary winding of the main transformer. capacitor is adequate to supply VDD during startup.
18 V Zener diode to protect power MOSFET transistors
circuit is implemented to minimize EMI. and output voltage overshoot. stability and prevents sub-harmonic oscillation. ramp at every switching cycle as slope compensation. high-line inp ut voltage equal to that at low -line input. should be less than 100 and 470 pF, respectively. Figure 21. Current-Sense R-C Filter
Figure 23. 44 W Flyback 12 V/2 A, 5 V/4 A Application Circuit
© 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN6755W / FAN6755UW • Rev. 1.0.7 15 FAN6755W / FAN6755UW — mWSaver™ Controller Bill of Materials Designator Part Type Designator Part Type BD1 BD 4 A/600 V Q1 MOS 9 A/600 V C1 YC 2200 pF/Y1 R1 R 1.5 M 1/4 W C2 YC 2200 pF/Y1 R2 R 1.5 M 1/4 W C3 XC 0.33 µF/300 V R3 R 10 M 1/4 W C4 NC R4, R5, R6, R7 R 47 1/4 W C5 YC 2200 pF/Y1 R8, R17, R25, R27 NC C6 CC 2200 pF/100 V R9 R 50 K 1/4 W C7 CC 1000 pF/100 V R10 R 50 K 1/4 W C8 EC 1000 µF/25 V R11 R 0 1/8 W C9 EC 470 µF/25 V R12 R 47 1/8 W C10 CC 100 pF/50 V R13 R 100 K 1/8 W C11 EC 100 µF/400 V R14 R 0 1/4 W C12 C 1 µF/50 V R15 R 10 K 1/8 W C13 EC 1000 µF/10 V R16 R 1 1/8 W C14 EC 470 µF/10 V R18 R 0 1/8 W C15 CC 100 pF/50 V R19 R 100 1/8 W C16 C 1 nF/50 V R20 R 1 K 1/8 W C17 C 470 pF/50 V R21 R 4.7 K 1/8 W C18 EC 47 µF/50 V R22 R 7.5 K 1/8 W C19 C 0.01 µF/50 V R23 R 120 K 1/8 W C20 C 0.1 µF/50 V R24 R 15 K 1/8 W D1 FYP1010 R26 R 10 K 1/8 W D2 1N4148 R28 R 0.43 2 W D3 FR107 TX1 800 µH(ERL-28) D4 FR103 U1 IC FAN6755W D5 FYP1010 U2 IC PC817 ZD1 P6KE150A U3 IC TL431 F1 FUSE 4A/250V M1 VZ 9G L1 13 mH L2 Inductor (2 µH) L3 Inductor (2 µH)
1.75 MAX
B) ALL DIMENSIONS ARE IN MILLIMETERS. 200 MICROINCHES / 5.08 MICRONS MIN. LEAD/TIN (SOLDER) ON COPPER.
0.25 C B A
Figure 24. 7-Lead, Small Outline Package (SOP) specifically the warranty therein, which covers Fairchild products. http://www.fairchildsemi.com/packaging/.
© 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN6755W / FAN6755UW • Rev. 1.0.7 17 FAN6755W / FAN6755UW — mWSaver™ Controller