FLS3217 / FLS3247 Single-Stage PFC Primary-Side-Regulation Offline LED Driver with Integrated Power MOSFET Features Description Cost-Effective Solution without Input Bulk Capacitor and Feedback Circuitry Power-Factor Correction (PFC) This highly integrated PWM controller with power MOSFET, FLS3217 / FLS3247, provides several features to enhance the performance of low-power flyback converters. The proprietary topology enables simplified circuit design for LED lighting applications. Linear Frequency Control for Increased Efficiency Application Voltage Range: 80VAC ~ 308VAC Integrated Power MOSFET Accurate Constant-Current (CC) Control Independent Online Voltage, Output Voltage, and Magnetizing Inductance Variation Open / Short-LED Protection Cycle-by-Cycle Current Limiting Over-Temperature Protection with Auto Restart Low Startup Current: 20μA Low Operating Current: 5mA VDD Over-Voltage Protection (OVP) VDD Under-Voltage Lockout (UVLO) By using the single-stage topology with primary-side regulation, an LED lighting board can be implemented with the few external components and minimized cost; requiring no input bulk capacitor or feedback circuitry. To implement good power factor and low THD, constant on-time control is utilized with an external capacitor connected to COMI. Precise constant-current control regulates accurate output current versus changes in input voltage and output voltage. The operating frequency is proportionally changed by the output voltage to guarantee DCM operation with higher efficiency and simple design. FLS3217 and FLS3247 provide protection features such as open-LED, short-LED, and over-temperature protection. The current-limit level is automatically reduced to minimize the output current and protect external components in short-LED condition. Applications LED Lighting System Ordering Information Part Number Operating Temperature Range FLS3217M FLS3217N Package 7-Lead, Small Outline Package (SOIC) -40°C to +125°C FLS3247N 7-Lead, Small Outline Package (DIP) Packing Method Tape & Reel Tube . © 2012 Fairchild Semiconductor Corporation FLS3217 / FLS3247 • Rev. 1.0.0 www.fairchildsemi.com FLS3217 / FLS3247 — Single-Stage PFC Primary-Side-Regulation Offline LED Driver with Integrated Power MOSFET May 2012 BRIDGE DIODE TRANS LINE INPUT FUSE DRAIN 7 2 VDD NC 6 5 COMI VS 4 3 GND CS 1 Figure 1. Typical Application Internal Block Diagram DRAIN 7 Internal Bias Shutdown Max. Duty Controller VDD Good VDD 2 VOVP Gate Driver + S Q - + OCP Level Controller R + S Q LEB - R TSD VOCP - OSC VS Sawtooth Generator + VDD Good NC 5 COMI 6 GND 3 TRUECURRENT® Calculation VREF Freq. Sample & Hold VS Figure 2. © 2012 Fairchild Semiconductor Corporation FLS3217 / FLS3247 • Rev. 1.0.0 Error Amp. tDIS Detector + DCM Frequency Controller Auto Restart Protection: OVP (Over-Voltage Protection) UVLO (Under-Voltage Lockout) OTP (Over-Temperature Protection) 1 CS Functional Block Diagram 4 VS FLS3217 / FLS3247 — Single-Stage PFC Primary-Side-Regulation Offline LED Driver with Integrated Power MOSFET Application Diagram www.fairchildsemi.com 2 ZXYTT S3217 TM 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 (M=SOIC, N=DIP) M: Manufacture Flow Code ZXYTT S3247 TM Figure 3. Top Mark Pin Configuration Figure 4. Pin Configuration Pin Definitions Pin # Name Description 1 CS Current Sense. This pin connects a current-sense resistor to detect the MOSFET current for the output-current regulation in Constant-Current (CC) regulation. 2 VDD Power Supply. IC operating current and MOSFET driving current are supplied using this pin. 3 GND Ground 4 VS 5 COMI 6 NC 7 DRAIN Voltage Sense. This pin detects the output voltage information and discharge time for maximum frequency control and constant current regulation. This pin is connected to an auxiliary winding of the transformer via resistors of the divider. Constant Current Loop Compensation. This pin is connected to a capacitor between the COMI and GND pins for compensation current loop gain. No Connect Power MOSFET Drain. This pin is the high-voltage power MOSFET drain. © 2012 Fairchild Semiconductor Corporation FLS3217 / FLS3247 • Rev. 1.0.0 FLS3217 / FLS3247 — Single-Stage PFC Primary-Side-Regulation Offline LED Driver with Integrated Power MOSFET Marking Information www.fairchildsemi.com 3 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 Parameter Min. (1,2) Max. Unit 30 V VVDD DC Supply Voltage VVS VS Pin Input Voltage -0.3 7.0 V VCS CS Pin Input Voltage -0.3 7.0 V COMI Pin Input Voltage -0.3 7.0 V VCOMI ID Continuous Drain Current IDM Pulsed Drain Current IAR Avalanche Current PD Power Dissipation JA Thermal Resistance (Junction-to-Air) JC Thermal Resistance (Junction-to-Case) TJ TSTG TL ESD TA=25°C, FLS3217M/N 1 TA=25°C, FLS3247N 4 FLS3217M/N 4 FLS3247N 16 FLS3217M/N - FLS3247N 1 4 SOIC, TA＜50°C DIP, TA＜50°C 1 W DIP, TA＜50°C 95 SOIC, TA＜50°C 40 DIP, TA＜50°C 25 +150 -55 Lead Temperature (Soldering 10 seconds) A mW 150 Storage Temperature Range A 660 SOIC, TA＜50°C Maximum Junction Temperature A °C/W °C/W °C +150 °C +260 °C ESD Capability, Human Body Model 5 ESD Capability, Charged Device Model 2 V Notes: 1. Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. 2. All voltage values, except differential voltages, are given with respect to GND pin. 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 Operating Ambient Temperature © 2012 Fairchild Semiconductor Corporation FLS3217 / FLS3247 • Rev. 1.0.0 Min. Max. Unit -40 125 °C FLS3217 / FLS3247 — Single-Stage PFC Primary-Side-Regulation Offline LED Driver with Integrated Power MOSFET Absolute Maximum Ratings www.fairchildsemi.com 4 Unless otherwise specified, VDD=15V and TA=25°C. Symbol Parameter Condition Min. Typ. Max. Unit MOSFET Section BVDSS Drain-Source Breakdown Voltage RDS(ON) FLS3217M Static Drain-Source FLS3217N On Resistance FLS3247N FLS3217M CISS Input Capacitance FLS3217N FLS3247N FLS3217M COSS Output Capacitance FLS3217N FLS3247N ID=250µA, VGS=0V 700 ID=0.5A, VGS=10V ID=1A, VGS=10V VGS=0V, VDS=25V, fS=1MHz V 13 16 Ω 8.8 11.0 Ω 2.4 2.8 Ω 175 200 pF 250 pF 435 pF 23 VGS=0V, VDS=25V, fS=1MHz 25 pF 25 pF 51 pF VDD Section VDD-ON Turn-On Threshold Voltage 14.5 16.0 17.5 V VDD-OFF Turn-Off Threshold Voltage 6.75 7.75 8.75 V 2.85 4.00 5.00 mA 2 20 μA 22.0 23.5 25.0 V IDD-OP Operating Current IDD-ST Startup Current VOVP VDD Over-Voltage Protection Level VS=2.4V, CL=MOSFET CISS VDD=VDD-ON – 0.16V Oscillator Section fMAX-CC Maximum Frequency in CC VDD=10V, 20V 60 65 70 kHz fMIN-CC Minimum Frequency in CC VDD=10V, 20V 21.0 23.5 26.0 kHz VSMAX-CC VS for Maximum Frequency in CC Frequency=Maximum Frequency-2kHz 2.25 2.35 2.45 V VSMIN-CC VS for Minimum Frequency in CC Frequency=Minimum Frequency +1kHz 0.55 0.85 1.15 V tON(MAX) Maximum Turn-on Time 12 14 16 s 2.475 2.500 2.525 V 2.38 2.43 2.48 V Current-Sense Section VRV Reference Voltage VCCR Variation Test Voltage on CS Pin for Constant Current Regulation tLEB Leading-Edge Blanking Time tMIN Minimum On Time in CC tPD Propagation Delay to GATE Output DSAW Duty Cycle of SAW Limiter 40 % tDIS-BNK tDIS Blanking Time of VS 1.5 s IVS-BNK VS Current for VS Blanking 100 A VCS=0.24V VVS=-0.5V, VCS=1.5V 50 300 ns 600 ns 100 150 ns Continued on the following page… © 2012 Fairchild Semiconductor Corporation FLS3217 / FLS3247 • Rev. 1.0.0 FLS3217 / FLS3247 — Single-Stage PFC Primary-Side-Regulation Offline LED Driver with Integrated Power MOSFET Electrical Characteristics www.fairchildsemi.com 5 Unless otherwise specified, VDD=15V and TA=25°C. Symbol Parameter Condition Min. Typ. Max. Unit Current-Error-Amplifier Section mho Gm Transconductance ICOMI-SINK COMI Sink Current VEAI=3V, VCOMI=5V 25 38 A COMI Source Current VEAI=2V, VCOMI=0V 25 38 A VCOMI-HGH COMI High Voltage VEAI=2V 4.7 VCOMI-LOW COMI Low Voltage VEAI=3V ICOMI-SOURCE 85 V 0.1 V Over-Current Protection Section VOCP VLowOCP VCS Threshold Voltage for OCP 0.60 0.67 0.74 V VCS Threshold Voltage for Low OCP 0.13 0.18 0.23 V VLowOCP-EN VS Threshold Voltage to Enable LOW OCP Level 0.40 V VLowOCP-DIS VS Threshold Voltage to Disable LOW OCP Level 0.60 V Over-Temperature-Protection Section TOTP TOTP-HYS Threshold Temperature for OTP(3) 140 Restart Junction Temperature Hysteresis 150 10 160 o C o C Note: 3. When the over-temperature protection (OTP) is activated, the power system enters Auto-Recovery Mode and output is disabled. © 2012 Fairchild Semiconductor Corporation FLS3217 / FLS3247 • Rev. 1.0.0 FLS3217 / FLS3247 — Single-Stage PFC Primary-Side-Regulation Offline LED Driver with Integrated Power MOSFET Electrical Characteristics (Continued) www.fairchildsemi.com 6 1.5 1.3 1.3 Normalized to 25 °C Normalized to 25 °C 1.5 1.1 0.9 FLS3217M 0.7 FLS3217N 1.1 0.9 FLS3217M 0.7 FLS3217N FLS3247N FLS3247N 0.5 0.5 -40 -30 -15 0 25 50 75 85 100 -40 125 -30 -15 0 VDD-ON vs. Temperature Figure 6. 1.5 1.5 1.3 1.3 Normalized to 25 °C Normalized to 25 °C Figure 5. 1.1 0.9 FLS3217M 0.7 50 75 85 100 125 FLS3217N 100 125 100 125 VDD-OFF vs. Temperature 1.1 0.9 FLS3217M 0.7 FLS3217N FLS3247N FLS3247N 0.5 0.5 -40 -30 -15 0 25 50 75 85 100 -40 125 -30 -15 0 Figure 7. IDD-OP vs. Temperature Figure 8. 1.5 1.3 1.3 Normalized to 25 °C 1.5 1.1 0.9 FLS3217M 0.7 25 50 75 85 Temp [°C] Temp [°C] Normalized to 25 °C 25 Temp [°C] Temp [°C] FLS3217N VOVP vs. Temperature 1.1 0.9 FLS3217M 0.7 FLS3217N FLS3247N FLS3247N 0.5 0.5 -40 -30 -15 0 25 50 75 85 100 -40 125 Figure 9. fMAX_CC vs. Temperature © 2012 Fairchild Semiconductor Corporation FLS3217 / FLS3247 • Rev. 1.0.0 -30 -15 0 25 50 75 85 Temp [°C] Temp [°C] Figure 10. fMIN_CC vs. Temperature FLS3217 / FLS3247 — Single-Stage PFC Primary-Side-Regulation Offline LED Driver with Integrated Power MOSFET Typical Performance Characteristics www.fairchildsemi.com 7 1.5 1.3 1.3 Normalized to 25 °C Normalized to 25 °C 1.5 1.1 0.9 FLS3217M 0.7 FLS3217N 1.1 0.9 FLS3217M 0.7 FLS3217N FLS3247N FLS3247N 0.5 0.5 -40 -30 -15 0 25 50 75 85 100 125 -40 -30 -15 0 Temp [°C] 50 75 85 100 125 100 125 Figure 12. VVVR vs. Temperature 1.5 1.5 1.3 1.3 Normalized to 25 °C Normalized to 25 °C Figure 11. VCCR vs. Temperature 1.1 0.9 FLS3217M 0.7 25 Temp [°C] FLS3217N 1.1 0.9 FLS3217M 0.7 FLS3217N FLS3247N FLS3247N 0.5 0.5 -40 -30 -15 0 25 50 75 85 100 125 -40 Temp [°C] -15 0 25 50 75 85 Temp [°C] Figure 13. VOCP vs. Temperature © 2012 Fairchild Semiconductor Corporation FLS3217 / FLS3247 • Rev. 1.0.0 -30 Figure 14. VOCP_Low vs. Temperature FLS3217 / FLS3247 — Single-Stage PFC Primary-Side-Regulation Offline LED Driver with Integrated Power MOSFET Typical Performance Characteristics (Continued) www.fairchildsemi.com 8 FLS3217 / FLS3247 is an AC-DC PWM controller for ® LED lighting applications. TRUECURRENT techniques regulate accurate LED current independent of input voltage, output voltage, and magnetizing inductance variations. The linear frequency control in the oscillator reduces conduction loss and maintains DCM operation in the wide range of output voltage, which implements high power factor correction in a single-stage flyback topology. A variety of protections, such as short/openLED protection, over-temperature protection, and cycleby-cycle current limitation stabilize system operation and protect external components. Startup Power-Factor Controller (PFC) and Total Harmonic Distortion (THD) In a conventional boost converter, Boundary Conduction Mode (BCM) is generally used to keep input current in phase with input voltage for Power Factor (PF) and Total Harmonic Distortion (THD). In flyback / buck boost topology, constant turn-on time and constant frequency I Discontinuous Conduction Mode (DCM) can implement high PF and low THD as shown in Figure 16. Constant turn-on time is maintained by the internal error amplifier and a large external capacitor (typically over 1µF) at the COMI pin. Constant frequency and DCM operation is managed by linear frequency control. Powering at startup is slow due to the low feedback-loop bandwidth in the PFC converter. To increase power during startup, the internal oscillator counts 12ms to define Startup Mode. During Startup Mode, turn-on time is determined by current-mode control with 0.2V voltage limit. Transconductance becomes 14 times bigger, as shown in Figure 15. After Startup Mode, turn-on time is controlled by Voltage Mode, using the COMI voltage. The error amplifier transconductance is reduced to 85µmho. IIN IIN_AVG VDD = VDD_ON VIN GATE Constant Frequency VCS 0.2V VCOMI Figure 16. Input Current and Switching Linear Frequency Control 14gm gm DCM should be guaranteed for high power factor in flyback topology. To maintain DCM in the wide range of output voltage, frequency is linearly changed by output voltage in linear frequency control. Output voltage is detected by auxiliary winding and a resistive divider connected to the VS pin, as shown in Figure 17. Startup Mode: 12ms ILED Time Figure 15. Startup Sequence Constant Current Regulation The output current can be estimated using the peak drain current and inductor current discharge time because output current is same as the average of the diode current in steady state. The peak value of the drain current is determined by the CS pin and the inductor discharge time (tDIS) is sensed by tDIS detector. By using three pieces of information (peak drain current, inductor discharging time, and operating switching period); the TRUECURRENT block calculates estimates the output current. The output of the TRUECURRENT calculation is compared with an internal precise reference to generate an error voltage, VCOMI, which determines the turn-on time in Voltage-Mode control. With Fairchild’s innovative technique, constant current output can be precisely controlled. © 2012 Fairchild Semiconductor Corporation FLS3217 / FLS3247 • Rev. 1.0.0 Figure 17. Linear Frequency Control When the output voltage decreases, the secondary diode conduction time is increased and the linear frequency control lengthens the switching period. This maintains DCM operation in the wide output voltage range, as shown in Figure 18. The frequency control also lowers primary rms current with better power efficiency in full-load condition. FLS3217 / FLS3247 — Single-Stage PFC Primary-Side-Regulation Offline LED Driver with Integrated Power MOSFET Functional Description www.fairchildsemi.com 9 Secondary Current LED Short ! nVo Lm VO = VO.nom t VIN t DIS 3 n VO 4 Lm VO = 75% VO.nom 4 t 3 DIS VCS 0.2V 4 t 3 3 n VO 5 Lm VO = 60% VO.nom 5 t DIS 3 VDD VDD_ON 5 t 3 VDD_OFF Figure 18. Primary and Secondary Current Figure 20. Waveforms at Short-LED Condition BCM Control The end of secondary diode conduction time is possibly over a switching period set by linear frequency control. In this case, FLS3217 and FLS3247 don’t allow CCM and the operation mode changes from DCM to BCM. Therefore, FLS3217 and FLS3247 eliminate subharmonic distortion in CCM. Short-LED Protection In the event of a short LED condition, the switching MOSFET and secondary diode are usually stressed by the high-power current. However, FLS3217 and FLS3247 change OCP level in short-LED condition. When VS is lower than 0.4V, the OCP level lowers to 0.2V from 0.7V, as shown in Figure 17. Power is limited and external component current stress is relieved. LEB Open LED Protection FLS3217 and FLS3247 protect external components, such as diode and capacitor, at secondary side in openLED condition. During switch-off, the VDD capacitor is charged up to the auxiliary winding voltage, which is applied as the reflected output voltage. Because the VDD voltage has output voltage information, the internal voltage comparator on the VDD pin can trigger output over-voltage protection (OVP), as shown in Figure 21. When at least one LED is open-circuited, output load impedance becomes very high and the output capacitor is quickly charged up to VOVP x Ns / Na. Then switching is shutdown and VDD block goes into “Hiccup Mode” until the open-LED condition is removed, shown in Figure 22. Internal Bias 1 CS VOCP VDD Good + - VDD 2 VOVP - + + - At VS < 0.4V, VOCP = 0.2V. 4 VS At VS > 0.6V, VOCP = 0.7V. S Figure 19. Internal OCP Block VDD Good Figure 20 shows operational waveforms at short-LED condition. Output voltage is quickly lowered to 0V after the LED-short event. Then the reflected auxiliary voltage is also 0V, making VS less than 0.4V. 0.2V OCP level limits the primary-side current and VDD “hiccups” up and down in between UVLO hysteresis. © 2012 Fairchild Semiconductor Corporation FLS3217 / FLS3247 • Rev. 1.0.0 Q Shutdown Gate Driver R Figure 21. Internal OVP Block FLS3217 / FLS3247 — Single-Stage PFC Primary-Side-Regulation Offline LED Driver with Integrated Power MOSFET Primary Current www.fairchildsemi.com 10 The built-in temperature-sensing circuit shuts down PWM output once the junction temperature exceeds 150°C. While PWM output is off, VDD gradually drops to the UVLO voltage. Some of the internal circuits are shut down and VDD gradually increases again. When VDD reaches 16V, all the internal circuits start operating. If the junction temperature is still higher than 140°C, the PWM controller shuts down immediately. Figure 22. Waveforms at Open-LED Condition Under-Voltage Lockout (UVLO) The turn-on and turn-off thresholds are fixed internally at 16V and 7.5V, respectively. During startup, the VDD capacitor must be charged to 16V through the startup resistor, so that the FLS32x7 is enabled. The VDD capacitor supplies VDD until power can be delivered from the auxiliary winding of the main transformer. VDD must not drop below 7.5V during startup. The UVLO hysteresis window ensures that the VDD capacitor is adequate to supply VDD during startup. © 2012 Fairchild Semiconductor Corporation FLS3217 / FLS3247 • Rev. 1.0.0 FLS3217 / FLS3247 — Single-Stage PFC Primary-Side-Regulation Offline LED Driver with Integrated Power MOSFET Over-Temperature Protection (OTP) www.fairchildsemi.com 11 5.00 4.80 A 3.81 0.65TYP 3.81 7 6 5 B 1.75TYP 6.20 5.80 4.00 3.80 4 2 3 1 PIN #1 1.27 (0.33) 3.85 7.35 0.25 C B A TOP VIEW 1.27 LAND PATTERN RECOMMENDATION SEE DETAIL A 0.25 0.10 0.25 0.19 1.75 MAX C 0.51 0.33 FRONT VIEW OPTION A - BEVEL EDGE 0.10 C OPTION B - NO BEVEL EDGE 0.50 x 45° 0.25 R0.10 GAGE PLANE R0.10 0.36 NOTES: A) THIS PACKAGE DOES NOT FULLY CONFORMS TO JEDEC MS-012 VARIATION AA. B) ALL DIMENSIONS ARE IN MILLIMETERS. 8° 0° 0.90 0.406 SEATING PLANE (1.04) C) DIMENSIONS DO NOT INCLUDE MOLD FLASH OR BURRS. D) DRAWING FILENAME : M07Brev3 DETAIL A SCALE: 2:1 Figure 23. 7-Lead, SOIC, Depopulated JEDEC MS-112, .150" Narrow Body, Dual-DAP, 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/. © 2012 Fairchild Semiconductor Corporation FLS3217 / FLS3247 • Rev.1. 0.0 FLS3217 / FLS3247 — Single-Stage PFC Primary-Side-Regulation Offline LED Driver with Integrated Power MOSFET Physical Dimensions www.fairchildsemi.com 12 9.40 9.00 7 5 6.60 6.20 1 4 (0.56) 3.60 3.20 5.08 MAX 7.62 0.33 3.60 3.00 2.54 0.35 0.20 0.56 0.36 9.91 7.62 1.62 1.42 7.62 NOTES: UNLESS OTHERWISE SPECIFIED A) THIS PACKAGE COMPLIES TO JEDEC MS-001, VARIATION BA, EXCEPT FOR TERMINAL COUNT (7 RATHER THAN 8) 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 REVISION: MKT-NA07BREV2 Figure 24. 7-Lead, Molded Dual In-Line Package, MDIP, .300" Wide, Dual DAP 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/. © 2012 Fairchild Semiconductor Corporation FLS3217 / FLS3247 • Rev. 1.0.0 FLS3217 / FLS3247 — Single-Stage PFC Primary-Side-Regulation Offline LED Driver with Integrated Power MOSFET Physical Dimensions www.fairchildsemi.com 13 FLS3217 / FLS3247 — Single-Stage PFC Primary-Side-Regulation Offline LED Driver with Integrated Power MOSFET 14 www.fairchildsemi.com © 2012 Fairchild Semiconductor Corporation FLS3217 / FLS3247 • Rev. 1.0.0