FSL127H Green Mode Fairchild Power Switch (FPS™) Features Description The highly integrated FSL127H consists of a current mode Pulse Width Modulator (PWM) and an avalancherugged 700V SenseFET. It is specifically designed for high-performance offline Switch Mode Power Supplies (SMPS) with minimal external components. Built-in 5ms Soft-Start Function Internal Avalanche-Rugged 700V SenseFET Low Audio Noise High-Voltage Startup Fixed PWM Frequency at 100KHz Linearly Decreasing PWM Frequency to 18KHz Peak-Current-Mode Control Cycle-by-Cycle Current Limiting Leading-Edge Blanking (LEB) Synchronized Slope Compensation Internal Open-Loop Protection (OLP) VDD Under-Voltage Lockout (UVLO) VDD Over-Voltage Protection (OVP) Constant Power Limit (Full AC Input Range) Internal OTP Sensor with Hysteresis Applications General-purpose switch-mode power supplies and flyback power converters, including: SMPS for VCR, SVR, STB, DVD & VCD Player, Printer, Facsimile, & Scanner Adapter for Camcorder The integrated PWM controller features include a proprietary green-mode function that provides off-time modulation to linearly decrease the switching frequency at light-load conditions to minimize standby power consumption. To avoid acoustic noise problems, the minimum PWM frequency is set above 18KHz. This green-mode function enables the power supply to meet international power conservation requirements. With the internal high-voltage startup circuitry, the power loss due to bleeding resistors is also eliminated. To further reduce power consumption, the PWM controller is manufactured using the BiCMOS process, which allows an operating current of only 3.5mA. The FSL127H built-in synchronized slope compensation achieves stable peak-current-mode control. The proprietary external line compensation ensures constant output power limit over a wide AC input voltage range, from 90VAC to 264VAC. The FSL127H provides many protection functions. In addition to cycle-by-cycle current limiting, the internal open-loop protection circuit ensures safety when an open-loop or output short-circuit failure occurs. PWM output is disabled until VDD drops below the UVLO lower limit, when the controller starts up again. As long as VDD exceeds ~28V, the internal OVP circuit is triggered. Compared to a discrete MOSFET and controller or RCC switching converter solution, the FSL127H reduces total component count, design size, and weight while increasing efficiency, productivity, and system reliability. These devices provide a basic platform well suited for design of cost-effective flyback converters. Ordering Information Part Number SenseFET Operating Temperature Range Package Packing Method FSL127HNY 2.0A 700V -40°C to +105°C 8-Pin Dual In-Line Package (MDIP), JEDEC MS-001, .300" Wide Tube © 2010 Fairchild Semiconductor Corporation FSL127H • Rev. 1.0.2 www.fairchildsemi.com FSL127H — Green Mode Fairchild Power Switch (FPS™) September 2010 HV Drain VIN FB VDD GND Figure 1. Typical Flyback Application Output Power Table(1) (2) Product 230VAC ± 15% (3) Adapter 85-265VAC Open Frame (4) (3) Adapter Open Frame (4) FSL127H 14W 20W 11W 16W Notes: 1. The maximum output power can be limited by junction temperature. 2. 230 VAC or 100/115 VAC with doublers. 3. Typical continuous power in a non-ventilated enclosed adapter with sufficient drain pattern as a heat sink, at TA=50°C ambient. 4. Maximum practical continuous power in an open-frame design with sufficient drain pattern as a heat sink, at TA=50°C ambient. Internal Block Diagram Figure 2. Internal Block Diagram © 2010 Fairchild Semiconductor Corporation FSL127H • Rev. 1.0.2 www.fairchildsemi.com 2 FSL127H — Green Mode Fairchild Power Switch (FPS™) Application Diagram F – Fairchild Logo Z – Plant Code X – 1-Digit Year Code Y – 1-Digit Week Code TT – 2-Digit Die Run Code T – Package Type (N: DIP) P – Y: Green Package M – Manufacture Flow Code Figure 3. Pin Configuration Pin Definitions Pin # Name Description 1 GND Ground. SenseFET source terminal on primary side and internal control ground. 2 VDD Power Supply. The internal protection circuit disables PWM output as long as VDD exceeds the OVP trigger point. 3 FB Feedback. The signal from the external compensation circuit is fed into this pin. The PWM duty cycle is determined in response to the signal on this pin and the current-sense signal on the SENSE pin. 4 VIN Line-Voltage Detection. The line-voltage detection is used for constant output power limit. It is suggested to add a low pass filter to filter out line ripple on bulk capacitor. 5 HV Startup. For startup, this pin is pulled high to the line input or bulk capacitor via resistors. 6 Drain SenseFET Drain. High-voltage power SenseFET drain connection. 7 Drain SenseFET Drain. High-voltage power SenseFET drain connection. 8 Drain SenseFET Dain. High-voltage power SenseFET drain connection. © 2010 Fairchild Semiconductor Corporation FSL127H • Rev. 1.0.2 www.fairchildsemi.com 3 FSL127H — Green Mode Fairchild Power Switch (FPS™) Pin Configuration Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions 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 VDRAIN Parameter Drain Pin Voltage Min. (5,6) (7) Max. Unit 700 V IDM Drain Current Pulsed 8 A EAS Single Pulsed Avalanche Energy 140 mJ VVDD DC Supply Voltage 30 V (8) VFB FB 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) 1.5 W θJA Junction-to-Air Thermal Resistance 80 °C/W 35 °C/W +150 °C +150 °C +260 °C Junction-to-Top Thermal Resistance Ψ JT TJ (9) Operating Junction Temperature TSTG -55 Storage Temperature Range TL Lead Temperature (Wave Soldering or IR, 10 Seconds) ESD Electrostatic Discharge Capability, (10) All Pins Except HV Pin Human Body Model: JESD22-A114 4.5 Charged Device Model: JESD22-C101 1.5 kV Notes: 5. All voltage values, except differential voltages, are given with respect to the network ground terminal. 6. Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. 7. Non-repetitive rating: pulse width is limited by maximum junction temperature. 8. L = 51mH, starting TJ = 25°C. 9. Measured on the package top surface. 10. All pins including HV pin: HBM=500V, CDM=1250V. Recommended Operating Conditions 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 TA Parameter Min. Operating Ambient Temperature © 2010 Fairchild Semiconductor Corporation FSL127H • Rev. 1.0.2 -40 Typ. Max. Unit +105 °C www.fairchildsemi.com 4 FSL127H — Green Mode Fairchild Power Switch (FPS™) Absolute Maximum Ratings VDD=15V and TA=25°C unless otherwise specified. Symbol Parameter SenseFET Section BVDSS Drain- Source Breakdown Voltage IDSS Zero-Gate-Voltage Drain Current RDS(ON) Conditions Min. Typ. Max. Unit (11) Drain-Source On-State Resistance VGS = 0V (12) 700 V VDS = 700V, VGS = 0V 0.5 50.0 VDS = 560V, VGS = 0V, TA = 125°C 1 200 μA VGS = 10V, ID = 0.5A 6.0 7.2 Ω 550 715 pF CISS Input Capacitance VGS = 0V, VDS = 25V, f = 1MHz COSS Output Capacitance VGS = 0V, VDS = 25V, f = 1MHz 38 50 pF CRSS Reverse Transfer Capacitance VGS = 0V, VDS = 25V, f = 1MHz 17 26 pF Turn-On Delay Time VDS = 350V, ID = 1.0A 20 50 ns Rise Time VDS = 350V, ID = 1.0A 15 40 ns Turn-Off Delay Time VDS = 350V, ID = 1.0A 55 120 ns Fall Time VDS = 350V, ID = 1.0A 25 60 ns 22 V 13 V td(on) tr td(off) tf VDD Section VOP Continuously Operating Voltage VDD-ON Start Threshold Voltage VDD-OFF Minimum Operating Voltage IDD-ST Startup Current VDD-ON – 0.16V IDD-OP Operating Supply Current VDD = 15V, VFB = 3V IDD-BM Green-Mode Operating Supply Current VFB = VZDC IDD-OLP Internal Sink Current VTH-OLP+0.1V 11 12 7 8 3.0 3.5 9 V 30 µA 4.0 mA 2 30 60 mA 90 µA VTH-OLP IDD-OLP Off Voltage 5 6 7 V VDD-OVP VDD Over-Voltage Protection 27 28 29 V tD-VDDOVP VDD Over-Voltage Protection Debounce Time 75 130 200 µs 1.5 3.5 5.0 mA 1 20 µA 100 106 kHz 18 22 kHz HV Section IHV IHV-LC Maximum Current Drawn from HV Pin HV 120VDC, VDD = 0V with 10µF Leakage Current After Startup HV = 700V, VDD = VDD-OFF+1V Oscillator Section fOSC Frequency in Nominal Mode fOSC-G Green-Mode Frequency DMAX Maximum Duty Cycle Center Frequency 94 14 85 % fDV Frequency Variation vs. VDD Deviation VDD = 9V to 22V 5 % fDT Frequency Variation vs. Temperature (11) Deviation TA = -40 to +105°C 5 % Continued on the following page… © 2010 Fairchild Semiconductor Corporation FSL127H • Rev. 1.0.2 www.fairchildsemi.com 5 FSL127H — Green Mode Fairchild Power Switch (FPS™) Electrical Characteristics VDD=15V and TA=25°C unless otherwise specified. Symbol Parameter Conditions Min. Typ. Max. Unit VIN Section VIN-ON PWM Turn-on Threshold Voltage 0.98 1.03 1.08 V VIN-RL Release Latch Voltage 0.60 0.70 0.80 V VIN-H Pull HIGH Latch Trigger Level 4.4 4.7 5.0 V tIN-H Pull HIGH Latch Debounce Time VIN-L Pull LOW Auto Recovery Trigger Level µs 120 0.2 0.3 0.4 V Feedback Input Section AV FB Voltage to Current-Sense Attenuation ZFB Input Impedance VFB-OPEN VFB-OLP Output High Voltage 1/4.0 V/V 9.5 kΩ 5 V FB Open-Loop Trigger Level 4.4 4.6 4.8 V tD-OLP Delay Time of FB Pin Open-loop Protection 50 56 59 ms VFB-N Green-Mode Entry FB Voltage 2.3 2.5 2.7 V VFB-G Green-Mode Ending FB Voltage VFB-ZDC VFB-N 0.1 Zero Duty Cycle FB Voltage 1.9 V 2.1 2.3 V Min. Typ. Max. Unit PWM Frequency fOSC fOSC-G VFB-ZDC VFB-G VFB-N VFB Figure 4. VFB vs. PWM Frequency Symbol Parameter Conditions Current-Sense Section ILIM at VIN = 1.2V Peak Current Limit VIN = 1.2V 0.51 0.61 0.71 A ILIM at VIN = 3.6V Peak Current Limit VIN = 3.6V 0.44 0.54 0.64 A 4.5 5.0 5.5 ms tSS (11) Period During Soft-Start Time Over-Temperature Protection Section (OTP) TOTP Protection Junction Temperature (11,13) 142 °C Notes: 11. These parameters, although guaranteed, are not 100% tested in production. 12. Pulse test: pulse width ≤ 300μs, duty ≤ 2%. 13. When activated, the output is disabled and the latch is turned off. © 2010 Fairchild Semiconductor Corporation FSL127H • Rev. 1.0.2 www.fairchildsemi.com 6 FSL127H — Green Mode Fairchild Power Switch (FPS™) Electrical Characteristics (Continued) Figure 5. IDD-ST vs. Temperature Figure 7. VDD-ON vs. Temperature Figure 8. Figure 9. VTH-OLP vs. Temperature Figure 10. VDD-OVP vs. Temperature © 2010 Fairchild Semiconductor Corporation FSL127H • Rev. 1.0.2 Figure 6. IDD-OP vs. Temperature VDD-OFF vs. Temperature www.fairchildsemi.com 7 FSL127H — Green Mode Fairchild Power Switch (FPS™) Typical Characteristics Figure 11. IHV vs. Temperature Figure 12. fOSC vs. Temperature Figure 13. fOSC-G vs. Temperature Figure 14. VIN-ON vs. Temperature Figure 15. VIN-RL vs. Temperature Figure 16. VIN-H vs. Temperature © 2010 Fairchild Semiconductor Corporation FSL127H • Rev. 1.0.2 www.fairchildsemi.com 8 FSL127H — Green Mode Fairchild Power Switch (FPS™) Typical Characteristics Figure 17. VIN-L vs. Temperature Figure 18. VFB-N vs. Temperature Figure 19. VFB-OLP vs. Temperature Figure 20. tD-OLP vs. Temperature Figure 21. VFB-ZDC vs. Temperature Figure 22. IDD-BM vs. Temperature © 2010 Fairchild Semiconductor Corporation FSL127H • Rev. 1.0.2 www.fairchildsemi.com 9 FSL127H — Green Mode Fairchild Power Switch (FPS™) Typical Characteristics Startup Operation Green-Mode Operation For startup, the HV pin is connected to the line input or bulk capacitor through the external resistor RHV, as shown in Figure 23. Typical startup current drawn from the HV pin is 3.5mA and it charges the VDD capacitor through the resistor RHV. The startup current turns off when the VDD capacitor voltage reaches VDD-ON. The VDD capacitor maintains VDD until the auxiliary winding of the transformer provides the operating current. The FSL127H uses feedback voltage (VFB) as an indicator of the output load and modulates the PWM frequency, as shown in Figure 25, such that the switching frequency decreases as load decreases. In heavy load conditions, the switching frequency is 100kHz. Once VFB decreases below VFB-N (2.5V), the PWM frequency starts to linearly decrease from 100kHz to 18kHz to reduce the switching losses. As VFB decreases below VFB-G (2.4V), the switching frequency is fixed at 18kHz and FSL127H enters “deep” green mode to reduce the standby power consumption. As VFB decreases below VFB-ZDC (2.1V), FSL127H enters burst-mode operation. When VFB drops below VFB-ZDC, FSL127H stops switching and the output voltage starts to drop, which causes the feedback voltage to rise. Once VFB rises above VFB-ZDC, switching resumes. Burst mode alternately enables and disables switching, thereby reducing switching loss to improve power saving, as shown in Figure 26. R HV CDC DDD HV VDD NA C DD FSL127H AC line Figure 23. Startup Circuit Slope Compensation FSL127H is designed for flyback power converter. The peak-current-mode control is used to optimize system performance. Slope compensation is added to stabilize the current loop. The FSL127H inserts a synchronized, positively sloped ramp at each switching cycle. Soft Start Figure 25. PWM Frequency The FSL127H has internal soft-start circuit that slowly increases the SenseFET current after startup. The typical soft-start time is 5ms, during which the VLimit level is increased in six steps to smoothly establish the required output voltage, as shown in Figure 24. It also helps prevent transformer saturation and reduces stress on the secondary diode during startup. Figure 24. Soft-Start Function Figure 26. Burst Mode Operation © 2010 Fairchild Semiconductor Corporation FSL127H • Rev. 1.0.2 www.fairchildsemi.com 10 FSL127H — Green Mode Fairchild Power Switch (FPS™) Functional Description To limit the output power of the converter constantly, high/low line compensation is included. Sensing the converter input voltage through the VIN pin, the high/low line compensation function generates a relative peak-current-limit threshold voltage for constant power control, as shown in Figure 27. Figure 27. Constant Power Control Protections The FSL127H provides protection functions to prevent the power supply and the load from being damaged. The protection features include: Figure 29. OLP Operation VDD Over-Voltage Protection (OVP) VDD over-voltage protection prevents IC damage caused by over voltage on the VDD pin. The OVP is triggered when VDD reaches 28V. It has a debounce time (typically 130µs) to prevent false trigger by switching noise. Latch / Auto Recovery Function The FSL127H provides additional protections by the VIN pin, such as pull-HIGH latch and pull-LOW auto recovery that depend on the application. As shown in Figure 28, when VIN level is higher than 4.7V, FSL127H is latched until the VDD is discharged. FSL127H is in auto recovery when the VIN level is lower than 0.3V. Over-Temperature Protection (OTP) The SenseFET and the control IC are integrated, making it easier to detect the temperature of the SenseFET. When the temperature exceeds approximately 142°C, thermal shutdown is activated. Figure 28. VIN Pin Function Open-Loop / Overload Protection (OLP) When the upper branch of the voltage divider for the shunt regulator (KA431 shown) is broken, as shown in Figure 29, or over-current or output short occurs; there is no current flowing through the opto-coupler transistor, which pulls up the feedback voltage to 6V. When the feedback voltage is above 4.6V for longer than 56ms, OLP is triggered. This protection is also triggered when the SMPS output drops below the nominal value longer than 56ms due to the overload condition. © 2010 Fairchild Semiconductor Corporation FSL127H • Rev. 1.0.2 www.fairchildsemi.com 11 FSL127H — Green Mode Fairchild Power Switch (FPS™) Constant Power Control Application Fairchild Devices Input Voltage Range Output Adapter FSL127H 90~264VAC 12V/0.85A (10.2W) Features High efficiency (>76.74% at full load) meeting Energy Star V2.0 regulation with enough margin Standby power <100mW at no-load condition Provides full protection functions, including: OVP OTP OLP VIN-H VIN-L Latch Latch Auto Restart Latch Auto Restart Figure 30. Measured Standby Power Figure 31. Over-Current Protection Figure 32. Schematic of Typical Application Circuit © 2010 Fairchild Semiconductor Corporation FSL127H • Rev. 1.0.2 www.fairchildsemi.com 12 FSL127H — Green Mode Fairchild Power Switch (FPS™) Typical Application Circuit FSL127H — Green Mode Fairchild Power Switch (FPS™) Typical Application Circuit (Continued) Transformer Specification Core: EE16 Bobbin: EE16 Figure 33. Transformer Diagram TERMINAL NO. WIRE Ts S F W1 5 4 2UEW 0.3*1 13 W2 2 1 2UEW 0.26*1 75 W3 4 COPPER SHIELD 1.2 W4 8 TEX-E 0.35*1 13 CORE ROUNDING TAPE 3 10 Primary-Side Inductance=880μH ±5% Primary-Side Effective Leakage<20μH ±5% © 2010 Fairchild Semiconductor Corporation FSL127H • Rev. 1.0.2 www.fairchildsemi.com 13 FSL127H — Green Mode Fairchild Power Switch (FPS™) Physical Dimensions 9.83 9.00 6.67 6.096 8.255 7.61 3.683 3.20 5.08 MAX 7.62 0.33 MIN 3.60 3.00 (0.56) 2.54 0.56 0.355 0.356 0.20 9.957 7.87 1.65 1.27 7.62 NOTES: UNLESS OTHERWISE SPECIFIED A) THIS PACKAGE CONFORMS TO JEDEC MS-001 VARIATION BA B) ALL DIMENSIONS ARE IN MILLIMETERS. C) DIMENSIONS ARE EXCLUSIVE OF BURRS, MOLD FLASH, AND TIE BAR EXTRUSIONS. D) DIMENSIONS AND TOLERANCES PER ASME Y14.5M-1994 E) DRAWING FILENAME AND REVSION: MKT-N08FREV2. Figure 34. 8-pin Dual In-Line Package (DIP) Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision. 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 FSL127H • Rev. 1.0.2 www.fairchildsemi.com 14 FSL127H — Green Mode Fairchild Power Switch (FPS™) © 2010 Fairchild Semiconductor Corporation FSL127H • Rev. 1.0.2 www.fairchildsemi.com 15