FAN100_09

FAN100 — Primary-Side-Control PWM Controller June 2009 FAN100 Primary-Side-Control PWM Controller Features Constant-Voltage (CV) and Constant-Current (CC) Control without Secondary-Feedback Circuitry Accurate Constant Current Achieved by Fairchild’s Proprietary TRUECURRENT™ Technique Green Mode: Frequency Reduction at Light Load Fixed PWM Frequency at 42kHz with Frequency Hopping to Reduce EMI Low Startup Current: 10μA Maximum Low Operating Current: 3.5mA Peak-Current-Mode Control in CV Mode Cycle-by-Cycle Current Limiting Over-Temperature Protection with Auto-Restart Brownout Protection with Auto-Restart VDD Over-Voltage Protection with Auto-Restart VDD Under-Voltage Lockout (UVLO) Gate Output Maximum Voltage Clamped at 18V SOP-8 Package Description The primary-side PWM controller FAN100 significantly simplifies power supply design that requires CV and CC regulation capabilities. The FAN100 controls the output voltage and current precisely with the information in the primary side of the power supply, not only removing the output current sensing loss, but eliminating secondary feedback circuitry. The green-mode function with a low startup current (10µA) maximizes the light-load efficiency so the power supply can meet stringent standby power regulations. Compared with a conventional secondary-side regulation approach, the FAN100 can reduce total cost, component count, size, and weight; while simultaneously increasing efficiency, productivity, and system reliability. FAN100 controller is available in an 8-pin SOP package. A typical output CV/CC characteristic envelope is shown in Figure 1. Applications Battery Chargers for Cellular Phones, Cordless Phones, PDA, Digital Cameras, Power Tools Replaces Linear Transformer and RCC SMPS Offline High Brightness (HB) LED Drivers Related Resources AN-6067 — Design Guide for FAN100/102 and FSEZ1016A/1216 Figure 1. Typical Output V-I Characteristic Ordering Information Part Number FAN100MY Operating Temperature Range -40°C to +125°C Eco Status Green Package 8-Lead, Small Outline Package (SOP-8) Packing Method Tape & Reel For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html. © 2009 Fairchild Semiconductor Corporation FAN100 Rev. 1.0.2 www.fairchildsemi.com FAN100 — Primary-Side-Control PWM Controller Application Diagram Figure 2. Typical Application Internal Block Diagram + OVP VDD 7 28V Internal Bias Brownout OTP Auto-Restart Protection VDD + Soft-Driver 16V/5V OSC with Freq Hopping 8 Gate S + Q RQ + PWM Comparator PWM Comparator 1.3V Leading-Edge Blanking EA_I GND EA_V 6 3 COMI 4 COMV 2 GND Figure 3. Functional Block Diagram © 2009 Fairchild Semiconductor Corporation FAN100 Rev. 1.0.2 2 - Green-Mode Controller + - + + PWM Comparator Slope Compensation IO Estimator 2.5V Brownout Protection tDIS Detector 2.5V 1 CS 5 VS Temp. Compensation VO Estimator www.fairchildsemi.com FAN100 — Primary-Side-Control PWM Controller Marking Information 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=SOP) P: Z: Pb free, Y: Green Package M: Manufacture Flow Code ZXYTT FAN100 TPM Figure 4. Top Mark Pin Configuration CS GND COMI COMV GATE VDD GND VS Figure 5. Pin Configuration Pin Definitions Pin # 1 2 3 4 5 6 7 Name CS GND COMI COMV VS GND VDD Description Current Sense. This pin connects a current-sense resistor to sense the MOSFET current for peak-current-mode control in CV mode and provides for output-current regulation in CC mode. Ground. Constant Current Loop Compensation. this pin connects a capacitor and a resistor between COMI and GND for compensation current loop gain. Constant Voltage Loop Compensation. this pin connects a capacitor and a resistor between COMV and GND for compensation voltage loop gain. Voltage Sense. This pin detects the output voltage information and discharge time based on voltage of auxiliary winding. This pin connects two divider resistors and one capacitor. Ground. Supply. The power supply pin. IC operating current and MOSFET driving current are supplied using this pin. This pin is connected to an external VDD capacitor of typically 10µF. The threshold voltages for startup and turn-off are 16V and 5V, respectively. The operating current is lower than 5mA. PWM Signal Output. This pin outputs PWM signal and includes the internal totem-pole output driver to drive the external power MOSFET. The clamped gate output voltage is 18V. 8 GATE © 2009 Fairchild Semiconductor Corporation FAN100 Rev. 1.0.2 www.fairchildsemi.com 3 FAN100 — Primary-Side-Control PWM 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 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 VDD VVS VCS VCOMV VCOMI PD ΘJA ΘJC TJ TSTG TL ESD DC Supply Voltage (1,2) Parameter VS Pin Input Voltage CS Pin Input Voltage Voltage Error Amplifier Output Voltage Voltage Error Amplifier Output Voltage Power Dissipation (TA＜50°C) Thermal Resistance (Junction-to-Air) Thermal Resistance (Junction-to-Case) Operating Junction Temperature Storage Temperature Range Lead Temperature (Wave Soldering or IR, 10 Seconds) Electrostatic Discharge Capability Human Body Model, JEDEC: JESD22-A114 Charged Device Model, JEDEC: JESD22-C101 Min. -0.3 -0.3 -0.3 -0.3 Max. 30 7.0 7.0 7.0 7.0 660 150 39 +150 Unit V V V V V mW °C /W °C /W °C °C °C KV -55 +150 +260 4.5 2.0 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 Conditions Min. -40 Typ. Max. +125 Unit °C © 2009 Fairchild Semiconductor Corporation FAN100 Rev. 1.0.2 www.fairchildsemi.com 4 FAN100 — Primary-Side-Control PWM Controller Electrical Characteristics VDD=15V and TA=-40°C~+125°C (TA=TJ), unless otherwise specified. Symbol VDD Section VOP VDD-ON VDD-OFF IDD-OP IDD-ST IDD-GREEN VDD-OVP tD-VDDOVP Parameter Continuously Operating Voltage Turn-On Threshold Voltage Turn-Off Threshold Voltage Operating Current Startup Current Green Mode Operating Supply Current VDD Over-Voltage Protection Level VDD Over-Voltage Protection Debounce Time Conditions Min. Typ. Max. 25 Units V V V mA μA mA V μs 15 4.5 VDD=20V, fS=fOSC, VVS=2V, VCS=3V, CL=1nF 0< VDD < VDD-ON-0.16V VDD=20V, VVS=2.7V, fS=fOSC-N-MIN, VCS=0V, CL=1nF, VCOMV=0V VCS=3V, VVS=2.3V fS=fOSC, VVS=2.3V 27 100 16 5.0 3.5 3.7 1.0 28 250 17 5.5 5.0 10.0 2.5 29 400 Oscillator Section Center Frequency Frequency Hopping Range TA=25°C TA=25°C TA=25°C VVS=2.7V, VCOMV=0V VVS=2.3V, VCS=0.5V TA=25°C, VDD=10V to 25V 39.0 ±1.8 42.0 ±2.6 3 550 20 5 20 45.0 KHz ±3.6 ms Hz KHz % % fOSC Frequency tFHR fOSC-N-MIN Frequency Hopping Period Minimum Frequency at No Load fOSC-CM-MIN Minimum Frequency at CCM fDV fDT Frequency Variation vs. VDD Deviation Frequency Variation vs. Temperature TA=-40°C to 125°C Deviation Voltage-Sense Section IVS-UVP Itc VBIAS-COMV Sink Current for Brownout Protection IC Compensation Bias Current Adaptive Bias Voltage Dominated by VCOMV VCOMV=0V, TA=25°C, RVS=20KΩ RVS=20KΩ 180 9.5 1.4 μA μA V Current-Sense Section tPD tMIN-N tMINCC VTH Propagation Delay to GATE Output Minimum On Time at No Load Minimum On Time in CC Mode Threshold Voltage for Current Limit VVS=-0.8V, RS=2KΩ, VCOMV=1V VVS=0V, VCOMV=2V 100 1100 300 1.3 200 ns ns ns V Continued on following page… © 2009 Fairchild Semiconductor Corporation FAN100 Rev. 1.0.2 www.fairchildsemi.com 5 FAN100 — Primary-Side-Control PWM Controller Electrical Characteristics (Continued) VDD=15V and TA=-40°C~+125°C (TA=TJ), unless otherwise specified. Symbol VVR VN VG IV-SINK IV-SOURCE VV-HGH Parameter Reference Voltage Green Mode Starting Voltage on COMV Pin Green Mode Ending Voltage on COMV Pin Output Sink Current Output Source Current Output High Voltage Conditions Min. 2.475 Typ. 2.500 2.8 0.8 90 90 Max. 2.525 Units V V V μA μA V Voltage-Error-Amplifier Section fS=fOSC-2KHz VVS=2.3V fS=1KHz VVS=3V, VCOMV=2.5V VVS=2V, VCOMV=2.5V VVS=2.3V 4.5 Current-Error-Amplifier Section VIR II-SINK II-SOURCE VI-HGH Reference Voltage Output Sink Current Output Source Current Output High Voltage VCS=3V, VCOMI=2.5V VCS=0V, VCOMI=2.5V VCS=0V 4.5 2.475 2.500 55 55 2.525 V μA μA V Gate Section DCYMAX VOL VOH VOH_MIN tr tf VCLAMP Maximum Duty Cycle Output Voltage Low Output Voltage High Output Voltage High Rising Time Falling Time Output Clamp Voltage VDD=20V, IO=10mA VDD=8V, IO=1mA VDD=5.5V, IO=1mA VDD=20V, CL=1nF VDD=20V, CL=1nF VDD=25V 5 4 200 80 15 300 150 18 75 1.5 % V V V ns ns V o Over-Temperature-Protection Section TOTP Threshold Temperature for OTP +140 C © 2009 Fairchild Semiconductor Corporation FAN100 Rev. 1.0.2 www.fairchildsemi.com 6 FAN100 — Primary-Side-Control PWM Controller Typical Performance Characteristics 17 5.5 16.6 5.3 VDD-OFF (V) -40 -30 -15 0 25 50 75 85 100 125 VDD-ON (V) 16.2 5.1 15.8 4.9 15.4 4.7 15 4.5 -40 -30 -15 0 25 50 75 85 100 125 Temperature (ºC) Temperature (ºC) Figure 6. Turn-On Threshold Voltage (VDD-ON) vs. Temperature Figure 7. Turn-Off Threshold Voltage (VDD-OFF) vs. Temperature 4 47 45 43 41 39 37 35 -40 -30 -15 0 25 50 75 85 100 125 3.6 IDD-OP (mA) 3.2 2.8 2.4 2 -40 -30 -15 0 25 50 75 85 100 125 Temperature (ºC) fOSC (KHz) Temperature (ºC) Figure 8. Operating Current (IDD-OP) vs. Temperature Figure 9. Center Frequency (fOSC) vs. Temperature 2.525 2.525 2.515 2.515 VVR (V) 2.495 VIR (V) -40 -30 -15 0 25 50 75 85 100 125 2.505 2.505 2.495 2.485 2.485 2.475 2.475 -40 -30 -15 0 25 50 75 85 100 125 Temperature (ºC) Temperature (ºC) Figure 10. Reference Voltage (VVR) vs. Temperature Figure 11. Reference Voltage (VIR) vs. Temperature © 2009 Fairchild Semiconductor Corporation FAN100 Rev. 1.0.2 www.fairchildsemi.com 7 FAN100 — Primary-Side-Control PWM Controller Typical Performance Characteristics 600 23 22 580 fOSC-CM-MIN (KHz) -40 -30 -15 0 25 50 75 85 100 125 fOSC-N-MIN (Hz) 21 20 19 18 17 -40 -30 -15 0 25 50 75 85 100 125 560 540 520 500 Temperature (ºC) Temperature (ºC) Figure 12. Minimum Frequency at No Load (fOSC-N-MIN) vs. Temperature Figure 13. Minimum Frequency at CCM (fOSC-CM-MIN) vs. Temperature 30 25 20 15 10 5 0 -40 -30 -15 0 25 50 75 85 100 125 1250 1170 SG (kHz/V) tMIN-N (ns) 1090 1010 930 850 -40 -30 -15 0 25 50 75 85 100 125 Temperature (ºC) Temperature (ºC) Figure 14. Green Mode Frequency Decreasing Rate (SG) vs. Temperature Figure 15. Minimum On Time at No Load (tMIN-N) vs. Temperature 3 2.5 2 1.5 1 0.5 0 -40 -30 -15 0 25 50 75 85 100 125 1 0.8 VG (V) VN (V) 0.6 0.4 0.2 0 -40 -30 -15 0 25 50 75 85 100 125 Temperature (ºC) Temperature (ºC) Figure 16. Green Mode Starting Voltage on COMV Pin (VN) vs. Temperature Figure 17. Green Mode Ending Voltage on COMV Pin (VG) vs. Temperature © 2009 Fairchild Semiconductor Corporation FAN100 Rev. 1.0.2 www.fairchildsemi.com 8 FAN100 — Primary-Side-Control PWM Controller Typical Performance Characteristics 95 92 95 91 IV-SOURCE (µA) -40 -30 -15 0 25 50 75 85 100 125 89 IV-SINK (µA) 86 83 80 77 74 87 83 79 75 -40 -30 -15 0 25 50 75 85 100 125 Temperature (ºC) Temperature (ºC) Figure 18. Output Sink Current (IV-SINK) vs. Temperature Figure 19. Output Source Current (IV-SOURCE) vs. Temperature 60 60 58 58 II-SOURCE (µA) -40 -30 -15 0 25 50 75 85 100 125 II-SINK (µA) 56 56 54 54 52 52 50 50 -40 -30 -15 0 25 50 75 85 100 125 Temperature (ºC) Temperature (ºC) Figure 20. Output Sink Current (II-SINK) vs. Temperature Figure 21. Output Source Current (II-SOURCE) vs. Temperature 80 76 DCYMAX (%) 72 68 64 60 -40 -30 -15 0 25 50 75 85 100 125 Temperature (ºC) Figure 22. Maximum Duty Cycle (DCYMAX) vs. Temperature © 2009 Fairchild Semiconductor Corporation FAN100 Rev. 1.0.2 www.fairchildsemi.com 9 FAN100 — Primary-Side-Control PWM Controller Functional Description 0 shows the basic circuit diagram of a primary-side regulated flyback converter and its typical waveforms are shown in 0. Generally, discontinuous conduction mode (DCM) operation is preferred for primary-side regulation since it allows better output regulation. The operation principles of DCM flyback converter are as follows: During the MOSFET on time (tON), input voltage (VDL) is applied across the primary side inductor (Lm). Then, MOSFET current (Ids) increases linearly from zero to the peak value (Ipk). During this time, the energy is drawn from the input and stored in the inductor. When the MOSFET is turned off, the energy stored in the inductor forces the rectifier diode (D) to be turned on. While the diode is conducting, the output voltage (Vo), together with diode forward-voltage drop (VF), is 2 applied across the secondary-side inductor (Lm×Ns / 2 Np ) and the diode current (ID) decreases linearly from the peak value (Ipk× Np/Ns) to zero. At the end of inductor current discharge time (tDIS), all the energy stored in the inductor has been delivered to the output. When the diode current reaches zero, the transformer auxiliary winding voltage (Vw) begins to oscillate by the resonance between the primary-side inductor (Lm) and the effective capacitor loaded across the MOSFET. During the inductor current discharge time, the sum of output voltage and diode forward-voltage drop is reflected to the auxiliary winding side as (Vo+VF)× Na/Ns. Since the diode forward-voltage drop decreases as current decreases, the auxiliary winding voltage reflects the output voltage best at the end of diode conduction time where the diode current diminishes to zero. Thus, by sampling the winding voltage at the end of the diode conduction time, the output voltage information can be obtained. The internal error amplifier for output voltage regulation (EA_V) compares the sampled voltage with internal precise reference to generate error voltage (VCOMV), which determines the duty cycle of the MOSFET in CV mode. Meanwhile, the output current can be estimated using the peak drain current and inductor current discharge time since output current is the same as average of the diode current in steady state. The output current estimator detects the peak value of the drain current with a peak detection circuit and calculates the output current using the inductor discharge time (tDIS) and switching period (ts). This output information is compared with the internal precise reference to generate error voltage (VCOMI), which determines the duty cycle of the MOSFET in CC mode. With Fairchild’s innovative technique, TRUECURRENT™, constant current (CC) output can be precisely controlled. Of the two error voltages, VCOMV and VCOMI, the smaller determines the duty cycle. During constant voltage regulation mode, VCOMV determines the duty cycle while VCOMI is saturated to HIGH. During constant current regulation mode, VCOMI determines the duty cycle while VCOMV is saturated to HIGH. Figure 23. Simplified PSR Flyback Converter Circuit I pk I pk ⋅ NP NS I D .avg = I o VF ⋅ NA NS VO ⋅ NA NS Figure 24. Key Waveforms of DCM Flyback Converter © 2009 Fairchild Semiconductor Corporation FAN100 Rev. 1.0.2 www.fairchildsemi.com 10 FAN100 — Primary-Side-Control PWM Controller Temperature Compensation Built-in temperature compensation provides constant voltage regulation over a wide range of temperature variation. This internal compensation current compensates the forward-voltage drop variation of the secondary side rectifier diode. Green-Mode Operation The FAN100 uses voltage regulation error amplifier output (VCOMV) 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 fixed at 42KHz. Once VCOMV decreases below 2.8V, the PWM frequency starts to linearly decrease from 42KHz to 550Hz to reduce the switching losses. As VCOMV decreases below 0.8V, the switching frequency is fixed at 550Hz and FAN100 enters into “deep green” mode, where the operating current reduces to 1mA, reducing the standby power consumption. Figure 26. Frequency Hopping Startup Figure 27 shows the typical startup circuit and transformer auxiliary winding for FAN100 application. Before FAN100 begins switching, it consumes only startup current (maximum 10μA) and the current supplied through the startup resistor charges the VDD capacitor (CDD). When VDD reaches turn-on voltage of 16V (VDD-ON), FAN100 begins switching, and the current consumed increases to 3.5mA. Then, the power required for FAN100 is supplied from the transformer auxiliary winding. The large hysteresis of VDD provides more hold-up time, which allows using small capacitor for VDD. Figure 25. Switching Frequency in Green Mode Leading-Edge Blanking (LEB) At the instant the MOSFET is turned on, a high-current spike occurs through the MOSFET, caused by primaryside capacitance and secondary-side rectifier reverse recovery. Excessive voltage across the RCS resistor can lead to premature turn-off of the MOSFET. FAN100 employs an internal leading edge blanking (LEB) circuit to inhibit the PWM comparator for a short time after the MOSFET turns on. External RC filtering is not required. Frequency Hopping 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. FAN100 has an internal frequency-hopping circuit that changes the switching frequency between 39.4kHz and 44.6kHz with a period of 3ms, as shown in Figure 26. Figure 27. Startup Circuit © 2009 Fairchild Semiconductor Corporation FAN100 Rev. 1.0.2 www.fairchildsemi.com 11 FAN100 — Primary-Side-Control PWM Controller Protections The FAN100 has several self-protective functions, such as Over-Voltage Protection (OVP), Over-Temperature Protection (OTP), and brownout protection. All the protections are implemented as auto-restart mode. When auto-restart protection is triggered, switching is terminated and the MOSFET remains off. This causes VDD to fall. When VDD reaches the VDD turn-off voltage of 5V, the current consumed by FAN100 reduces to the startup current (maximum 10µA) and the current supplied startup resistor charges the VDD capacitor. When VDD reaches the turn-on voltage of 16V, FAN100 resumes normal operation. In this manner, the autorestart alternately enables and disables the switching of the MOSFET until the fault condition is eliminated (see Figure 28). Power On Fault Occurs Fault Removed VDD Over-Voltage Protection (OVP) VDD over-voltage protection prevents damage from overvoltage conditions. If the VDD voltage exceeds 28V by open-feedback condition, OVP is triggered. The OVP has a debounce time (typical 250µs) to prevent false triggering by switching noise. It also protects other switching devices from over voltage. Over-Temperature Protection (OTP) The built-in temperature-sensing circuit shuts down PWM output if the junction temperature exceeds 140°C. Brownout Protection FAN100 detects the line voltage using auxiliary winding voltage since the auxiliary winding voltage reflects the input voltage when the MOSFET is turned on. VS pin is clamped at 1.15V while the MOSFET is turned on and brownout protection is triggered if the current out of VS pin is less than IVS-UVP (typical 180μA) during the MOSFET conduction. Pulse-by-pulse Current Limit When the sensing voltage across the current sense resistor exceeds the internal threshold of 1.3V, the MOSFET is turned off for the remainder of the switching cycle. In normal operation, the pulse-by-pulse current limit is not triggered since the peak current is limited by the control loop. VDS VDD 16V 5V Operating Current 3.5mA 10µA Normal Operation Fault Situation Normal Operation Figure 28. Auto-Restart Operation © 2009 Fairchild Semiconductor Corporation FAN100 Rev. 1.0.2 www.fairchildsemi.com 12 FAN100 — Primary-Side-Control PWM Controller Typical Application Circuit (Primary-Side Regulated Offline LED Driver) Application Offline LED Driver Fairchild Devices FAN100 Input Voltage Range 90~265VAC Output 24V/0.35A (8.4W) Features High Efficiency (>77% at Full Load) Tight Output Regulation (CC:±5%) 34 32 30 28 26 24 22 Output Voltage (V) 20 18 16 14 12 10 8 6 4 2 0 0 50 100 150 200 250 300 350 400 Output current (mA) AC90V AC230V AC120V AC264V Figure 29. Measured Efficiency and Output Regulation Figure 30. Typical Application Circuit Schematic © 2009 Fairchild Semiconductor Corporation FAN100 Rev. 1.0.2 www.fairchildsemi.com 13 FAN100 — Primary-Side-Control PWM Controller Typical Application Circuit (Continued) Transformer Specification Core: EFD-20 Bobbin: EFD-20 Pin Primary-Side Inductance Primary-Side Effective Leakage 3－4 3－4 Specification 1.08mH ± 5% 35μH ± 5%. 100kHz, 1V Remark Short one of the secondary windings © 2009 Fairchild Semiconductor Corporation FAN100 Rev. 1.0.2 www.fairchildsemi.com 14 FAN100 — Primary-Side-Control PWM Controller Physical Dimensions 5.00 4.80 3.81 8 5 A 0.65 B 6.20 5.80 4.00 3.80 1 4 1.75 5.60 PIN ONE INDICATOR (0.33) 1.27 0.25 M CBA 1.27 LAND PATTERN RECOMMENDATION 0.25 0.10 1.75 MAX C 0.10 0.51 0.33 0.50 x 45° 0.25 C SEE DETAIL A 0.25 0.19 OPTION A - BEVEL EDGE R0.10 R0.10 GAGE PLANE 0.36 OPTION B - NO BEVEL EDGE NOTES: UNLESS OTHERWISE SPECIFIED A) THIS PACKAGE CONFORMS TO JEDEC MS-012, VARIATION AA, ISSUE C, B) ALL DIMENSIONS ARE IN MILLIMETERS. C) DIMENSIONS DO NOT INCLUDE MOLD FLASH OR BURRS. D) LANDPATTERN STANDARD: SOIC127P600X175-8M. E) DRAWING FILENAME: M08AREV13 8° 0° 0.90 0.406 SEATING PLANE (1.04) DETAIL A SCALE: 2:1 Figure 31. 8-Lead, Small Outline Package (SOP-8) 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 FAN100 Rev. 1.0.2 www.fairchildsemi.com 15 FAN100 — Primary-Side-Control PWM Controller © 2009 Fairchild Semiconductor Corporation FAN100 Rev. 1.0.2 www.fairchildsemi.com 16