FAN6861 Low-Cost, Highly Integrated, Green-Mode PWM Controller for Peak Power Management Features Description Low Startup Current: 15µA Maximum Internal Soft Start: 10ms Highly integrated PWM controller, FAN6861 is optimized for applications with motor load; such as printer and scanner, which inherently impose some kind of overload condition on the power supply during acceleration mode. The two-level OCP function allows the SMPS to stably deliver peak power during the motor acceleration mode without causing premature shutdown and while protecting the SMPS from overload condition. Constant Output Power Limit (Full AC Input Range) Green-Mode and Burst-Mode Operation for Low Standby Power Consumption Frequency Hopping for EMI Reduction Peak-Current Mode Control with Cycle-by-Cycle Current Limiting Built-in Slope Compensation Two-Level Over-Current Protection (OCP) with Delayed Shutdown (780ms) for Peak Power Management Open-Loop / Over-Load Protection (OLP) VDD Over-Voltage Protection (OVP) Programmable Over-Temperature Protection (OTP) Applications Switched Mode Power Supply (SMPS) with Motor Load; such as for printer, scanner, motor drivers, etc. AC/DC Adapters The green-mode and burst-mode functions with a low operating current (2.2mA maximum in green mode) maximize the light load efficiency so that the power supply can meet most stringent standby power regulations. The frequency-hopping function helps reduce electromagnetic interference (EMI) of a power supply by spreading the energy over a wider frequency range. The constant power limit function; minimizes the components stress in abnormal condition and helps designer to optimize the power stage more easily. Many protection functions such; as OCP, OLP, OVP and OTP, are fully integrated into FAN6861, which improves the SMPS reliability without increasing the system cost. Open-Frame SMPS Ordering Information Part Number Operating Temperature Range FAN6861TY -40 to +105°C Eco Status Green Package Packing Method SSOT-6 Tape & Reel For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html. © 2009 Fairchild Semiconductor Corporation FAN6861 • Rev. 1.0.1 www.fairchildsemi.com FAN6861 — Low-Cost, Highly Integrated, Green-Mode PWM Controller for Peak Power Management May 2009 Figure 1. Typical Application Block Diagram GND 1 OVP 25V OLP OCP Auto Recovery Protection OVP OTP Latch-off Protection VDD Soft Driver S Latch-Off release R 4V VDD Blanking Circuit FB UVLO OCP Slope Compensation 3R SENSE OCP Delay 0.5V OTP1 Debounce RT OLP OTP 2 FB OLP Delay 4.6V 1V 3 SENSE 5.2V R IRT 4 Vlimit ramp (Include Soft-Start) Green Mode Controller 17.5V/9.5V GATE OSC Internal BIAS 5 6 Q FAN6861 — Low-Cost, Highly Integrated, Green-Mode PWM Controller for Peak Power Management Typical Application OTP2 Debounce 0.7V Figure 2. Block Diagram © 2009 Fairchild Semiconductor Corporation FAN6861 • Rev. 1.0.1 www.fairchildsemi.com 2 AAR: FAN6861 TT: Wafer lot code • • •: Year code _ _ _: Week code Figure 3. Top Mark Pin Configuration Figure 4. Pin Configuration Pin Definitions Pin # Name Description 1 GND Ground. 2 FB This pin is internally connected to the inverting input of the PWM comparator. The collector of an opto-coupler is typically tied to this pin. For stable operation, a capacitor should be placed between this pin and GND. If the voltage of this pin is higher than 4.6V for longer than 780ms, the overload protection is triggered and PWM output is disabled. 3 RT This pin is for programmable over-temperature protection. An external NTC thermistor is connected between this pin and GND pin. Once the voltage of this pin drops below a threshold of 0.7V, PWM output is disabled. 4 SENSE This pin is for current sense. This pin senses the voltage across a resistor. The voltage of this pin is compared with the feedback information determining the PWM duty cycle. 5 VDD This pin is the positive supply voltage input. 6 GATE The totem-pole output driver to drive the gate of power MOSFET. Soft driving waveform is implemented to reduce EMI. © 2009 Fairchild Semiconductor Corporation FAN6861 • Rev. 1.0.1 FAN6861 — Low-Cost, Highly Integrated, Green-Mode PWM Controller for Peak Power Management 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. All voltage values, except differential voltages, are given with respect to GND pin. Symbol Parameter VDD Supply Voltage VL Input Voltage to FB, SENSE, VIN, RT,RI Pin PD Power Dissipation at TA<50°C ΘJC Thermal Resistance (Junction-to-Case) TJ TSTG TL ESD Min. Max. Unit 30 V -0.3 7.0 V 300 mW 208.4 °C/W Operating Junction Temperature -40 +150 °C Storage Temperature Range -55 +150 °C +260 °C Lead Temperature, Wave Soldering, 10 Seconds Electrostatic Discharge Capability Human Body Model, JESD22-A114 4.5 Charge Device Model, JESD22-C101 1.0 kV 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 © 2009 Fairchild Semiconductor Corporation FAN6861 • Rev. 1.0.1 Min. Max. Unit -40 +105 °C FAN6861 — Low-Cost, Highly Integrated, Green-Mode PWM Controller for Peak Power Management Absolute Maximum Ratings www.fairchildsemi.com 4 VDD = 15V and TA = 25°C, unless otherwise noted. Symbol Parameter Test Condition Min. Typ. Max. Unit VDD Section VDD-OP Continuously Operating Voltage 24 V VDD-ON Turn-On Threshold Voltage 16.5 17.5 18.5 V VDD-OFF Turn-Off Voltage 8.5 9.5 10.5 V VDD-SCP Threshold Voltage for Output Short-Circuit Protection (SCP) VDD-OVP VDD Over-Voltage Protection (Latch-Off) VDD-LH Threshold Voltage for Latch-Off Release IDD-ST Startup Current VTH-ON – 0.16V IDD-OP Normal Operating Supply Current With 1nF Load on Gate, VFB ≥ VFB-N IDD-BM Green-Mode Operating Supply Current GATE Open, VFB = VFB-G VDD-OFF VDD-OFF VDD-OFF +0.5 +1.0 +1.5 26 V 24 25 V 3 4 5 V 8 15 µA 3 4 mA 2.2 mA VDD-OVP VDD Over-Voltage Protection (Latch-Off) 24 25 26 V tD-VDDOVP VDD OVP Debounce Time 100 170 240 µs IDD-LH Latch-Off Holding Current 25 40 55 µA 1/4.5 1/4.0 1/3.5 V/V 14 16 18 kΩ VDD = 5V Feedback Input Section AV Input Voltage to Current Sense Attenuation ZFB Input Impedance VFBO FB Pin Open Voltage 5.0 5.2 5.4 V Threshold Voltage for Open-loop Protection 4.3 4.6 4.9 V tD-OLP Open-Loop Protection Delay Time 700 780 860 ms tD-SCP Short-Circuit Protection Delay Time 20 25 30 ms 100 250 270 360 VFB-OLP At Green Mode Current Sense Section tPD Delay to Output tLEB Leading-Edge Blanking Time ns ns VSTHFL Flat Threshold Voltage for Current Limit Duty > 51% 0.85 0.89 0.93 V VSTHVA Valley Threshold Voltage for Current Limit Duty = 0% 0.65 0.70 0.75 V 0.47 0.50 0.53 V 0.30 0.33 0.36 V Soft-Start Time 7.5 10.0 12.5 ms FB Pin Protection Delay Time for Peak Loading 700 780 860 ms VOCP VSLOPE tSS tD-OCP OCP Trigger Level Slope Compensation Duty = DCYMAX Continued on following page… © 2009 Fairchild Semiconductor Corporation FAN6861 • Rev. 1.0.1 FAN6861 — Low-Cost, Highly Integrated, Green-Mode PWM Controller for Peak Power Management Electrical Characteristics www.fairchildsemi.com 5 VDD = 15V and TA = 25°C, unless otherwise noted. Symbol Parameter Test Condition Min. Typ. Max. VFB > VFB-N 60 65 70 VFB ≥ VFB-N ±3.7 ±4.2 ±4.7 VFB = VFB-G ±1.27 ±1.45 ±1.63 Unit Oscillator Section fOSC Normal PWM Frequency Center Frequency Jitter Range kHz thop-1 Jitter Period 1 VFB ≥ VFB-N 3.9 4.4 4.9 ms thop-3 Jitter Period 3 VFB = VFB-G 10.2 11.5 12.8 ms fOSC-G Green-Mode Minimum Frequency 18.0 22.5 25.0 kHz VFB-N Beginning of Green-On Mode at FB Level Pin, FB Voltage 2.60 2.85 3.10 V VFB-G Beginning of Green-Off Mode at FB Level Pin, FB Voltage 2.0 2.2 2.4 V SG VFB-ZDC Slope for Green-Mode Modulation 65 FB Threshold Voltage for Zero-duty fDV Frequency Variation vs. VDD Deviation VDD = 11.5V to 20V fDT Frequency Variation vs. Temperature Deviation TA = -30 to 85°C Hz/mV 1.7 1.9 2.1 V 0 0.02 2.00 % 2 % 75 % 1.5 V PWM Output Section DCYMAX Maximum Duty Cycle VOL Output Voltage LOW VDD = 15V, IO = 50mA VOH Output Voltage HIGH VDD = 12V, IO = 50mA tR Rising Time GATE = 1nF 230 ns tF Falling Time GATE = 1nF 30 ns Gate Output Clamping Voltage VDD = 20V VCLAMP 65 70 8 V 15.00 16.75 18.50 V 90 99 108 μA Over-Temperature Protection (OTP) Section IRT Output Current of RT Pin VRTO RT Pin Open Voltage VOTP1 Threshold Voltage for Over-Temperature Protection tDOTP-LATCH 3.7 0.92 Over-Temperature Latch-Off Debounce 1.00 V 1.08 V ms VFB = VFB-N 15 17 19 VFB = VFB-G 40 51 62 VOTP2 Second Threshold Voltage for OverTemperature Protection 0.65 0.70 0.75 V tDOTP2-LATCH Second Over-Temperature Latch-Off Debounce 50 100 150 μs © 2009 Fairchild Semiconductor Corporation FAN6861 • Rev. 1.0.1 FAN6861 — Low-Cost, Highly Integrated, Green-Mode PWM Controller for Peak Power Management Electrical Characteristics (Continued) www.fairchildsemi.com 6 VDD = 15V and TA = 25°C, unless otherwise noted. Symbol Parameter Test Condition Min. Typ. 65 70 Max. Unit 75 % 1.5 V PWM Output Section DCYMAX Maximum Duty Cycle VOL Output Voltage LOW VDD = 15V, IO = 50mA VOH Output Voltage HIGH VDD = 12V, IO = 50mA tR Rising Time GATE = 1nF 230 ns tF Falling Time GATE = 1nF 30 ns Gate Output Clamping Voltage VDD = 20V VCLAMP 8 V 15.00 16.75 18.50 V 90 99 108 μA Over-Temperature Protection (OTP) Section IRT Output Current of RT Pin VRTO RT Pin Open Voltage VOTP1 Threshold Voltage for Over-Temperature Protection tDOTP-LATCH VOTP2 tDOTP2-LATCH 3.7 V 0.92 1.00 1.08 VFB = VFB-N 15 17 19 VFB = VFB-G 40 51 62 Second Threshold Voltage for OverTemperature Protection 0.65 0.70 0.75 V Second Over-Temperature Latch-Off Debounce 50 100 150 μs Over-Temperature Latch-Off Debounce © 2009 Fairchild Semiconductor Corporation FAN6861 • Rev. 1.0.1 V ms FAN6861 — Low-Cost, Highly Integrated, Green-Mode PWM Controller for Peak Power Management Electrical Characteristics (Continued) www.fairchildsemi.com 7 VDD-ON vs Temperature (℃) VDD-OFF vs Temperature (℃) 18 10 17.8 9.8 17.6 VDD-OFF (V) VDD-ON (V) 9.6 17.4 17.2 9.4 9.2 17 9 16.8 16.6 8.8 -40℃ -30℃ -15℃ 0℃ 25℃ 50℃ 75℃ 85℃ 100℃ -40℃ 125℃ -30℃ -15℃ 0℃ Temperature (℃) 25℃ 50℃ 75℃ 85℃ 100℃ 125℃ Temperature (℃) Figure 5. Turn-On Threshold Voltage (VDD-ON) vs. Temperature Figure 6. Turn-Off Threshold Voltage (VDD-OFF) vs. Temperature IDD-OP vs Temperature (℃) FOSC vs Temperature (℃) 66 3.2 65.5 3.15 65 3.1 3.05 FOSC (kHz) IDD-OP (mA) 64.5 3 2.95 64 63.5 63 62.5 2.9 62 2.85 61.5 2.8 61 -40℃ -30℃ -15℃ 0℃ 25℃ 50℃ 75℃ 85℃ 100℃ 125℃ -40℃ -30℃ -15℃ 0℃ Temperature (℃) 25℃ 50℃ 75℃ 85℃ 100℃ 125℃ Temperature (℃) Figure 7. Operating Current (IDD-OP) vs. Temperature Figure 8. Normal PWM Frequency (fOSC) vs. Temperature VOCP vs Temperature (℃) DCYMAX vs Temperature (℃) 0.535 70 0.525 69.9 0.515 69.8 DCYMAX (%) VOCP (V) 0.505 0.495 0.485 69.7 FAN6861 — Low-Cost, Highly Integrated, Green-Mode PWM Controller for Peak Power Management Typical Performance Characteristics 69.6 0.475 69.5 0.465 0.455 -40℃ 69.4 -30℃ -15℃ 0℃ 25℃ 50℃ 75℃ 85℃ 100℃ 125℃ -40℃ Temperature (℃) -15℃ 0℃ 25℃ 50℃ 75℃ 85℃ 100℃ 125℃ Temperature (℃) Figure 9. OCP Trigger Level (VOCP) vs. Temperature © 2009 Fairchild Semiconductor Corporation FAN6861 • Rev. 1.0.1 -30℃ Figure 10. Maximum Duty Cycle (DCYMAX) vs. Temperature www.fairchildsemi.com 8 VFB-G vs Temperature (℃) 2.92 2.3 2.91 2.25 2.9 2.2 VFB-G (V) VFB-N (V) VFB-N vs Temperature (℃) 2.89 2.15 2.88 2.1 2.87 2.05 2 2.86 -40℃ -30℃ -15℃ 0℃ 25℃ 50℃ 75℃ 85℃ 100℃ -40℃ 125℃ -30℃ -15℃ 0℃ 25℃ 50℃ 75℃ 85℃ 100℃ 125℃ Temperature (℃) Temperature (℃) Figure 12. FB Voltage at fOSC-G (VFB-N) vs. Temperature Figure 11. FB Threshold Voltage For Frequency Reduction (VFB-N) vs. Temperature VZDC vs Temperature (℃) VOTP1 vs Temperature (℃) 2 1.1 1.95 1.05 VOTP1 (V) VZDC (V) 1.9 1.85 1 0.95 1.8 0.9 1.75 1.7 0.85 -40℃ -30℃ -15℃ 0℃ 25℃ 50℃ 75℃ 85℃ 100℃ -40℃ 125℃ -30℃ -15℃ 0℃ Temperature (℃) 25℃ 50℃ 75℃ 85℃ 100℃ 125℃ Temperature (℃) Figure 14. Threshold Voltage for Over-Temperature Protection (VOTP1) vs. Temperature Figure 13. FB Threshold Voltage for Zero Duty (VFB-ZDC) vs. Temperature VOTP2 vs Temperature (℃) IRT vs Temperature (℃) 104 0.72 102 0.715 100 98 IRT (µA) VOTP2 (V) 0.71 0.705 0.7 96 94 92 FAN6861 — Low-Cost, Highly Integrated, Green-Mode PWM Controller for Peak Power Management Typical Performance Characteristics 90 88 0.695 86 84 0.69 -40℃ -30℃ -15℃ 0℃ 25℃ 50℃ 75℃ 85℃ 100℃ -40℃ 125℃ -15℃ 0℃ 25℃ 50℃ 75℃ 85℃ 100℃ 125℃ Figure 16. Output Current of RT Pin (IRT) vs. Temperature Figure 15. Second Threshold Voltage for OverTemperature Protection (VOPT2) vs. Temperature © 2009 Fairchild Semiconductor Corporation FAN6861 • Rev. 1.0.1 -30℃ Temperature (℃) Temperature (℃) www.fairchildsemi.com 9 Startup Operation Figure 17 shows the typical startup circuit and transformer auxiliary winding for FAN6861 application. Before FAN6861 begins switching operation, it consumes only startup current (typically 8μA) and the current supplied through the startup resistor charges the VDD capacitor (CDD). When VDD reaches turn-on voltage of 17.5V (VDD-ON), FAN6861 begins switching and the current consumed increases to 3mA. Then, the power required is supplied from the transformer auxiliary winding. The large hysteresis of VDD (8V) provides more holdup time, which allows using small capacitor for VDD. The startup resistor is typically connected to AC line for a fast reset of latch protection. Figure 18. PWM Frequency Figure 17. Startup Circuit Figure 19. Burst Mode Operation Frequency Hopping Green-Mode Operation EMI reduction is accomplished by frequency hopping, which spreads the energy over a wider frequency range than the bandwidth measured by the EMI test equipment. An internal frequency hopping circuit changes the switching frequency between 60.8kHz and 69.2kHz with a period of 4.4ms, as shown in Figure 20. The FAN6861 uses feedback voltage (VFB) as an indicator of the output load and modulates the PWM frequency, as shown in Figure 18, such that the switching frequency decreases as load decreases. In heavy load conditions, the switching frequency is 65KHz. Once VFB decreases below VFB-N (2.85V), the PWM frequency starts to linearly decrease from 65KHz to 22kHz to reduce the switching losses. As VFB decreases below VFB-G (2.2V), the switching frequency is fixed at 22.5kHz and FAN6861 enters into deep green mode, where the operating current reduces to 2.2mA (maximum), further reducing the standby power consumption. As VFB decreases below VFB-ZDC (1.9V), FAN6861 enters into burst-mode operation. When VFB drops below VFB-ZDC, FAN6861 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 in standby mode, as shown in Figure 19. © 2009 Fairchild Semiconductor Corporation FAN6861 • Rev. 1.0.1 FAN6861 — Low-Cost, Highly Integrated, Green-Mode PWM Controller for Peak Power Management Operation Description Figure 20. Frequency Hopping www.fairchildsemi.com 10 Self-protective functions include VDD Over-Voltage Protection (OVP), Open-Loop/Overload Protection (OLP), Over-Current Protection (OCP), OverTemperature Protection (OTP). Among them, OLP, OCP, and SCP are auto-restart mode protections; while OVP and OTP are latch-mode protections. Auto-Restart Mode Protection: Once a fault condition is detected, switching is terminated and the MOSFET remains off. This causes VDD to fall because no more power is delivered from auxiliary winding. When VDD falls to VDD-OFF (9.5V), the protection is reset and the operating current reduces to startup current, which causes VDD to rise. FAN6861 resumes normal operation when VDD reaches VDD-ON (17.5V). In this manner, the auto-restart can alternately enable and disable the switching of the MOSFET until the fault condition is eliminated (see Figure 21). Latch-Mode Protection: Once this protection is triggered, switching is terminated and the MOSFET remains off. The latch is reset only when VDD is discharged below 4V by unplugging AC power line. Vds Protection Triggers Power On Fault Removed Figure 22. Two-Level OCP Operation Open-Loop / Over-Load Protection (OLP) When the upper branch of the voltage divider for the shunt regulator (KA431 shown) is broken, as shown in Figure 23, there is no current flowing through the optocoupler transistor, which pulls up the feedback voltage to 5.2V. VDD 17.5V When the feedback voltage is above 4.6V longer than 780ms, OLP is triggered. This protection is also triggered when the SMPS output drops below the nominal value longer than 780ms due to the overload condition. 9.5V Operating Current 3mA 8uA Normal Operation Fault Situation Normal Operation Figure 21. Auto Restart Operation Two-Level Over-Current Protection (OCP) FAN6861 has two levels of over-current protection thresholds. One is for pulse-by-pulse current limit, which turns off MOSFET for the remainder of the switching cycle when the sensing voltage of MOSFET drain current reaches the threshold. The other threshold is for the over-current protection, which shuts down the MOSFET gate when the sensing voltage of MOSFET drain current is above the threshold longer than the shutdown delay time (780ms). VFB 5.2V VFB-OLP (4.6V) This two-level OCP protection is designed for applications with peak load characteristics, such as printers and scanners. OLP Shutdown Delay Time These applications have motor load and inherently impose over-load condition on the power supply during © 2009 Fairchild Semiconductor Corporation FAN6861 • Rev. 1.0.1 FAN6861 — Low-Cost, Highly Integrated, Green-Mode PWM Controller for Peak Power Management acceleration mode. Therefore, the protection circuit should be triggered after a specified time to determine whether it is a transient situation or an abnormal situation. Protections OLP Triggers Figure 23. OLP Operation www.fairchildsemi.com 11 Leading-Edge Blanking (LEB) VDD over-voltage protection prevents IC damage caused by over voltage on the VDD pin. The OVP is triggered when VDD voltage reaches 25V. It has a debounce time (typically 250µs) to prevent false trigger by switching noise. Each time the power MOSFET is switched on, a turn-on spike occurs across the sense-resistor caused by primary-side capacitance and secondary-side rectifier reverse recovery. To avoid premature termination of the switching pulse, a leading-edge blanking time is built in. During this blanking period (360ns), the PWM comparator is disabled and cannot switch off the gate driver. Thus, RC filter with a small RC time constant is enough for current sensing. Over-Temperature Protection (OTP) The OTP circuit is composed of current source and voltage comparators. Typically NTC thermistor is connected between the RT pin and the GND pin. Once the voltage of this pin drops below a threshold of 0.7V, PWM output is disabled. Another comparator with 1V threshold is used to introduce hysteresis of OTP. Constant Output Power Limit FAN6861 has saw-limiter for pulse-by-pulse current limit, which guarantees almost constant power limit over different line voltages of universal input range. The conventional pulse-by-pulse current limiting scheme has a constant threshold for current limit comparator, which results in higher power limit for high line voltage. FAN6861 has a sawtooth current limit threshold that increases progressively within a switching cycle, which provides lower current limit for high line and makes the actual power limit level almost constant over different line voltages of universal input range, as shown in Figure 24. Figure 25. Current Sense R-C Filter Soft-Start The FAN6861 has an internal soft-start circuit that increases pulse-by-pulse current-limit comparator inverting input voltage slowly after it starts. The typical soft-start time is 10ms. The pulsewidth to the power MOSFET is progressively increased to establish the correct working conditions for transformers, rectifier diodes, and capacitors. The voltage on the output capacitors is progressively increased with the intention of smoothly establishing the required output voltage. It also helps to prevent transformer saturation and reduce the stress on the secondary diode during startup. Figure 24. Sawtooth Current Limiter © 2009 Fairchild Semiconductor Corporation FAN6861 • Rev. 1.0.1 FAN6861 — Low-Cost, Highly Integrated, Green-Mode PWM Controller for Peak Power Management VDD Over-Voltage Protection (OVP) www.fairchildsemi.com 12 Application Fairchild Devices Input Voltage Range SMPS for Printer FAN6861 90~264VAC Figure 26. Output 32V/0.6254A Nominal (20W) 32V/1.56A Peak (50W) Schematic of Application Circuit Transformer Core: EF-25/13/11 Primary-Side Inductance: 500µH Figure 27. © 2009 Fairchild Semiconductor Corporation FAN6861 • Rev. 1.0.1 Transformer Structure www.fairchildsemi.com FAN6861 — Highly Integrated Green-Mode PWM Controller Typical Application Circuit (Flyback Converter for Printer Application) FAN6861 — Low-Cost, Highly Integrated, Green-Mode PWM Controller for Peak Power Management Physical Dimensions Figure 28. 6-Pin SSOT-6 Package 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/. © 2009 Fairchild Semiconductor Corporation FAN6861 • Rev. 1.0.1 www.fairchildsemi.com 14 FAN6861 — Low-Cost, Highly Integrated, Green-Mode PWM Controller for Peak Power Management 15 www.fairchildsemi.com © 2009 Fairchild Semiconductor Corporation FAN6861 • Rev. 1.0.1