SG6846A Highly Integrated Green-Mode PWM Controller Features Description Low Startup Current: 8µA PWM Frequency Continuously Decreasing with Burst Mode at Light Loads The SG6846A is especially designed for SMPS with surge-current output, incorporated with a two-level OCP function. Besides the cycle-by-cycle current limiting, if the switching current is higher than two thirds the peakcurrent threshold for 1700ms, over-current protection is activated such that the SG6846A is latched off. VDD Over-Voltage Protection (OVP) OCP Threshold is Half Peak Current Limit Low Operating Current: 3.7mA Peak-Current Mode of Operation with Cycle-byCycle Current Limiting AC Input Brownout Protection with Hysteresis Constant Output Power Limit (Full AC Input Range) Internal Latch Circuit for OVP, OTP, and OCP Two-level OCP Delay: 1600ms Output Short-Circuited Delay Time: 100ms Programmable PWM Frequency with Frequency Hopping Feedback Open-loop Protection with 1700ms Delay Built-in Soft-Start Applications General-purpose switch-mode power supplies and flyback power converters, including: Power Adapters Open-frame SMPS If the switching current is higher than two thirds of the peak-current threshold for 100ms, and the voltage on the VDD is still higher than VDD-OFF + 1V, the PWM pulses are latched off immediately once the VDD voltage is lower than VDD-OFF + 1V. This is useful when an output short circuit occurs. SG6846A also integrates a frequency-hopping function internally to reduce EMI emission of a power supply with minimum line filters. Its built-in synchronized slope compensation provides proprietary internal compensation for constant output power limit over universal AC input range. Also, the gate output is clamped at 18V to protect the external MOSFET from over-voltage damage. Internal soft-start is built-in to soften the stress on the MOSFET and startup current during power on period. Other protection functions include AC input brownout protection with hysteresis, VDD over-voltage protection, and over-temperature protection. For over-temperature protection, an external NTC thermistor can be applied to sense the ambient temperature. When OCP, VDD OVP, or OTP is activated, an internal latch circuit latches off the controller. The PWM pulses stay latched off until the power supply is disconnected from the mains outlet. SG6846A controller is available in 8-pin SOP package. SMPS with Surge-current Output, such as for Printers, Scanners, Motor Drivers Ordering Information Operating Temperature Range OCP Latch SG6846ALSY -40 to +105°C Yes 8-Pin Small Outline Package (SOP) Tape & Reel SG6846ALSZ -40 to +105°C Yes 8-Pin Small Outline Package (SOP) Tape & Reel SG6846ACSY -40 to +105°C No 8-Pin Small Outline Package (SOP) Tape & Reel Part Number © 2008 Fairchild Semiconductor Corporation SG6846A • Rev. 1.1.5 Package Packing Method www.fairchildsemi.com SG6846A — Highly Integrated Green-Mode PWM Controller March 2012 L AC input EMI VO+ Filter + + N VO+ 7 3 VIN 4 RI 2 FB VDD GATE 8 SENSE 6 GND RT 5 1 SG6846A Figure 1. Typical Application Block Diagram SG6846A — Highly Integrated Green-Mode PWM Controller Typical Application Figure 2. Block Diagram © 2008 Fairchild Semiconductor Corporation SG6846A • Rev. 1.1.5 www.fairchildsemi.com 2 F: L = OCP Latch T: S = SOP P : Z = Lead Free + ROHS Compatible Null = regular package XXXXXXXX: Wafer Lot Y: Year; WW: Week V: Assembly Location SG6846AFTP XXXXXXXXYWWV ※ Marking for SG6846ALSZ (Pb-Free) Figure 3. Top Mark 1 : Fairchild logo Z: Plant Code X: Year Code Y: Week Code TT: Die Run Code F: L = OCP Latch, C = OCP auto-recovery T: Package type, S = SOP P: Y = Green Package M: Manufacturing flow code SG6846A — Highly Integrated Green-Mode PWM Controller Marking Information ※ Marking for SG6846ALSY (Green-compound), SG6846ACSY (Green-compound) Figure 4. Top Mark 2 © 2008 Fairchild Semiconductor Corporation SG6846A • Rev. 1.1.5 www.fairchildsemi.com 3 GND GATE FB VDD VIN SENSE RI RT Figure 5. Pin Configuration Pin Definitions Pin # Name Function 1 GND Ground 2 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 from this pin and the currentsense signal from pin 6. 3 VIN Line-voltage Detection Line-voltage detection is used for brownout protection with hysteresis. Constant output power limit over universal AC input range is achieved using this pin. Add a low-pass filter to filter out line ripple on the bulk capacitor. 4 RI Reference Setting RT Temperature Detection For over-temperature protection, an external NTC thermistor is connected from this pin to the GND pin. The impedance of the NTC decreases at high temperatures. Once the voltage of the RT pin drops below a threshold, PWM output is disabled. 5 Description Ground. A resistor from the RI pin to ground generates a reference current source that determines the switching frequency. Increasing the resistance reduces the switching frequency. A 26kΩ resistor results in a 65kHz switching frequency. 6 SENSE Current Sense The sensed voltage is used for peak-current-mode control and cycle-by-cycle current limiting. If the switching current is higher than OCP threshold and lasts for 1700ms, SG6846A turns off immediately. This two-level OCP feature is especially suitable for SMPS with surge current output. 7 VDD Power Supply If an open-circuit failure occurs in the feedback loop, the internal protection circuit disables PWM output as long as VDD exceeds a threshold. 8 GATE Driver Output The totem-pole output driver for the power MOSFET; internally clamped below 18V. © 2008 Fairchild Semiconductor Corporation SG6846A • Rev. 1.1.5 SG6846A — Highly Integrated Green-Mode PWM Controller Pin Configuration www.fairchildsemi.com 4 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 Min. Max. Unit 25 V -0.3 7.0 V VDD Supply Voltage VL Input Voltage to FB, SENSE, VIN, RT, RI Pins PD Power Dissipation at TA<50°C SOP 400 mW ΘJC Thermal Resistance (Junction-to-Case) SOP 54.4 °C/W TJ TSTG TL ESD Operating Junction Temperature -40 +150 °C Storage Temperature Range -65 +150 °C +260 °C Lead Temperature, Wave Soldering, 10 Seconds Human Body Model, JESD22-A114 5.0 Charge Device Model, JESD22-C101 1.5 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 © 2008 Fairchild Semiconductor Corporation SG6846A • Rev. 1.1.5 Min. Max. Unit -40 +105 °C SG6846A — Highly Integrated Green-Mode PWM Controller Absolute Maximum Ratings www.fairchildsemi.com 5 VDD = 15V and TA = 25°C unless otherwise noted. Symbol Parameter Test Condition Min. Typ. Max. Unit 20 V VDD Section VDD-OP Continuously Operating Voltage VDD-ON Turn-on Threshold Voltage 15.5 16.5 17.5 V VDD-OFF Turn-off Voltage 9.5 10.5 11.5 V VDD-SCP Threshold voltage on VDD for Short-Circuit Protection VDD-LH Threshold Voltage for Latch-off Release IDD-ST Startup Current VDD-ON – 0.16V IDD-OP Operating Supply Current GATE Open VDD-OFF VDD-OFF VDD-OFF +0.5V +1.0V +1.5V 3 V 4 5 V 8 30 µA 3.7 5.0 mA 22.6 23.6 24.6 V VDD-OVP VDD Over-Voltage Protection (Latch off) tD-VDDOVP VDD OVP Debounce Time RI = 26kΩ 60 100 140 µs VDD OVP Latch-off Holding Current VDD = 5V 30 50 70 µA IDD-OVP VIN Section VIN-OFF PWM Turn-off Threshold Voltage 0.65 0.70 0.75 V VIN-ON PWM Turn-on Threshold Voltage VIN-OFF +0.18 VIN-OFF +0.20 VIN-OFF +0.22 V 1/3.5 1/4.0 1/4.5 V/V Feedback Input Section AV Input-Voltage to Current-Sense Attenuation ZFB Input Impedance 4.0 5.5 7.0 kΩ VFBO FB Pin Open Voltage 5.2 6.2 6.6 V Threshold Voltage of Open-loop Protection 4.7 5.2 5.7 V 1600 1700 1800 ms VFB-OLP tD-OLP Open-loop Protection Delay Time RI = 26kΩ SG6846A — Highly Integrated Green-Mode PWM Controller Electrical Characteristics Current Sense Section ZSENSE Input Impedance 12 tPD Delay to Output 100 tLEB Leading-edge Blanking Time 270 360 kΩ 250 ns ns VSLOPE Slope Compensation Duty = DCYMAX 0.30 0.33 0.36 V VSTH1V Threshold Voltage for Current Limit VIN = 1V 0.80 0.83 0.86 V VSTH3V Threshold Voltage for Current Limit VIN = 3V 0.67 0.70 0.73 V VSTH1V-2/3 OCP Threshold Voltage for Current Limit VIN = 1V 0.58 0.61 0.64 V VSTH3V-2/3 OCP Threshold Voltage for Current Limit VIN = 3V 0.48 0.51 0.54 V tD-OCP Delay Time for Over-Current Protection RI = 26kΩ 1600 1700 1800 ms tD-SCP Delay Time for Output Short-Circuited Protection RI = 26kΩ; VDD<VDD-SCP 90 100 110 ms RI = 26kΩ 4.5 5.0 5.5 ms RI = 13kΩ 2.25 2.50 2.75 ms tSS-65KHz tSS-130KHz Period During Startup Time Continued on following page… © 2008 Fairchild Semiconductor Corporation SG6846A • Rev. 1.1.5 www.fairchildsemi.com 6 YES NO NO (2) IP > 2/3I PK or FB >VFB-OLP (5 ) Timing = 1700ms YES NO (6 ) VDD < = 12 V SCP OCP (3) Timing = 100 ms (7) Gate Off SCP Figure 6. SG6846A OCP/SCP Logic Flow Diagram Electrical Characteristics (Continued) VDD = 15V and TA = 25°C unless otherwise noted. Symbol Parameter Test Condition Min. Typ. Max. Unit 62 65 68 ±3.7 ±4.2 ±4.7 124 130 136 ±7.4 ±8.4 ±9.4 44.8 47.0 49.2 ±2.54 ±2.90 ±3.26 RI = 26kΩ, VFB VN 3.9 4.4 4.9 RI = 26kΩ, VFB = VG 10.2 11.5 12.8 18.0 22.5 25.0 kHz 1.9 2.1 2.3 V 3.7 4.2 4.7 KHz 1.4 1.6 1.8 V 1.27 1.45 1.62 KHz Oscillator Section fOSC Normal PWM Frequency Center Frequency RI = 26kΩ, VFB>VN Jitter Range fOSC,MAX fOSC,MIN Maximum PWM Frequency Center Frequency RI = 13kΩ, VFB>VN Jitter Range Center Minimum PWM Frequency Frequency RI = 36kΩ, VFB>VN Jitter Range thop-1 thop-3 Jitter Period fOSC-G Green-Mode Minimum Frequency RI = 26kΩ VFB-N Pin, FB voltage FB Pin Frequency Reduction Threshold Jitter Range RI = 26kΩ, VFB = VN VFB-G FB Voltage at fOSC-G Pin, FB voltage RI = 26kΩ, VFB = VG Jitter Range SG Slope for Green-Mode Modulation RI = 26kΩ fDV Frequency Variation vs. VDD Deviation VDD = 11.5V to 20V fDT Frequency Variation vs. Temperature Deviation TA = -30 to 85°C 85 1.5 SG6846A — Highly Integrated Green-Mode PWM Controller (4) VDD < 12 V (1) Normal Operation kHz kHz kHz ms Hz/mV 5 % 5.0 % Continued on following page… © 2008 Fairchild Semiconductor Corporation SG6846A • Rev. 1.1.5 www.fairchildsemi.com 7 Electrical Characteristics (Continued) VDD = 15V and TA = 25°C unless otherwise noted. Symbol Parameter Test Condition Min. Typ. Max. Unit 80 85 90 % 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 350 ns tF Falling Time GATE = 1nF 50 ns VCLAMP Gate Output Clamping Voltage VRTTH tDOTP-LATCH RRT-OFF V VDD = 20V Over-Temperature Protection (OTP) Section IRT 8 SG6846A — Highly Integrated Green-Mode PWM Controller Figure 7. PWM Frequency 18 V (1) Output Current of RT Pin RI = 26kΩ Threshold Voltage for OTP Over-Temperature Latch-off Debounce RI = 26kΩ (1) RI = 26kΩ Equivalent Impedance of RT for OTP 64 70 76 µA 1.015 1.065 1.115 V 100 14 15 ms 16 kΩ 36 kΩ RI Section RINOR RI Operating Range 13 RIMAX Maximum RI Value for Protection 10 RIMIN Minimum RI Value for Protection MΩ 6 Note: 1. The relationship between RRT-OFF and RI is: R RT-OFF VOTP-LATCH-OFF / IRT VRT / (70 A 26 / RI (K )) © 2008 Fairchild Semiconductor Corporation SG6846A • Rev. 1.1.5 kΩ (1) www.fairchildsemi.com 8 11.5 18 11.1 VDD-OFF (V) VDD-ON (V) 20 16 14 12 10.7 10.3 9.9 10 -40 -25 -10 5 20 35 50 65 80 9.5 95 110 125 -40 -25 -10 Temperature (℃) 35 50 65 80 95 110 125 Figure 9. Turn-off Threshold Voltage (VDD-OFF) vs. Temperature 30.0 10 IDD-ST (µA) 26.8 IDD-ST (µA) 20 Temperature (℃) Figure 8. Turn-on Threshold Voltage (VDD-ON) vs. Temperature 23.6 20.4 17.2 8 6 4 2 0 14.0 -40 -25 -10 5 20 35 50 65 80 10 95 110 125 11 12 13 14 15 16 VDD (V) Temperature (℃) Figure 10. Startup Current (IDD-ST) vs. Temperature Figure 11. Startup Current vs. VDD Voltage 2.5 1.00 2.0 0.98 VIN-ON (V) VIN-OFF (V) 5 SG6846A — Highly Integrated Green-Mode PWM Controller Typical Performance Characteristics 1.5 1.0 0.5 0.96 0.94 0.92 0.90 0.0 -40 -24 -7 -40 -25 -10 5 20 35 50 65 80 95 11 12 0 5 10 26 43 59 76 92 109 125 Temperature (℃) Temperature (℃ ) Figure 12. PWM Turn-off Threshold Voltage (VIN-OFF) vs. Temperature © 2008 Fairchild Semiconductor Corporation SG6846A • Rev. 1.1.5 Figure 13. PWM Turn-on Threshold Voltage (VIN-ON) vs. Temperature www.fairchildsemi.com 9 PWM Frequency (kHz) 85 FOSC (kHz) 80 75 70 65 60 -40 -25 -10 5 20 35 50 65 80 95 70 56 42 28 14 0 1.6 110 125 1.7 1.8 1.9 2.1 2.2 2.3 2.4 Figure 15. PWM Frequency vs. FB Voltage 0.90 0.90 0.85 0.82 0.80 VTH-O (V) VTH-P (V) Figure 14. Normal PWM Frequency (fOSC) vs. Temperature 0.75 0.70 0.74 0.66 0.58 0.65 0.50 0.60 0.7 0.9 1.1 1.3 1.5 1.7 1.9 2.1 2.3 2.5 2.7 2.9 3.1 3.3 0.7 0.9 1.1 1.3 1.5 1.7 1.9 2.1 2.3 2.5 2.7 2.9 3.1 3.3 VIN (V) VIN ( V ) Figure 16. Current-Limit Threshold vs. VIN Voltage Figure 17. 2/3 Current-Limit Threshold vs. VIN Voltage 71.0 1.4 70.5 1.2 VRTTH (V) IRT (µA) 2.0 VFB (V) Temperature (°C) SG6846A — Highly Integrated Green-Mode PWM Controller Typical Performance Characteristics (Continued) 70.0 69.5 69.0 1.0 0.8 0.6 68.5 -40 -25 -10 5 0.4 20 35 50 65 80 95 110 125 -40 -25 -10 Temperature (℃) 20 35 50 65 80 95 110 125 Temperature (℃) Figure 18. Output Current of RT Pin (IRT) vs. Temperature © 2008 Fairchild Semiconductor Corporation SG6846A • Rev. 1.1.5 5 Figure 19. FB Output High Voltage (VRTTH) vs. Temperature www.fairchildsemi.com 10 If an open-circuit or short-circuit to ground occurs at the RI pin, the internal protection circuit immediately shuts down the controller. Startup Operation The turn-on/turn-off thresholds are fixed internally at 16.5V and 10.5V. To enable the SG6846A during startup, the hold-up capacitor must first be charged to 16.5V through the startup resistor. Two-level Over-current Protection (OCP) The cycle-by-cycle current limiting shuts down the PWM immediately when the switching current is over the peak-current threshold. Additionally, when the switching current is higher than the over-current threshold, the internal counter counts down. When the total accumulated counting time is more than ~1600ms (RI = 26k), the controller is latched off and the internal counter counts up. When the switching current is lower than the over-current threshold, the internal counter counts down. When the total accumulated counting time is more than ~1600ms (RI = 26k), the controller is latched off. The hold-up capacitor continues to supply VDD before energy can be delivered from the auxiliary winding of the main transformer. The VDD must not drop below 10.5V during this startup process. This UVLO hysteresis window ensures that the hold-up capacitor can adequately supply VDD during startup. The typical startup current is only 8µA, which allows a high-resistance, low-wattage startup resistor to be used. For constant output power limit over a universal inputvoltage range, the peak-current threshold is adjusted by the voltage of the VIN pin. Since the VIN pin is connected to the rectified AC input line voltage through the resistive divider, a higher line voltage generates a higher VIN voltage. The threshold voltage decreases as the VIN increases, making the maximum output power at high line input voltage equal to that at low line input. The value of R-C network should not be so large it affects the power limit (shown in Figure 20). R and C should put on less than 300 and 1000pF, respectively, to minimize power loss. A 1.5M/0.25W startup resistor and a 10µF/25V VDD hold-up capacitor are sufficient for a universal input range. This two-level OCP protection and up/down counter are especially designed for SMPS with surge current output, such as those for printers, scanners, and motor drivers. Constant Output Power Limit For constant output power limit over universal inputvoltage range, the peak-current threshold is adjusted by the voltage of the VIN pin. Since the VIN pin is connected to the rectified AC input line voltage through the resistive divider, a higher line voltage generates a higher VIN voltage. The threshold voltage decreases as VIN increases, making the maximum output power at high-line input voltage equal to that at low-line input. The required operating current has been reduced to 3.7mA, which enables higher efficiency and reduces the VDD hold-up capacitance requirement. SG6846A — Highly Integrated Green-Mode PWM Controller Operation Description Brownout Protection Green-Mode Operation Since the VIN pin is connected through a resistive divider to the rectified AC input line voltage, it can also be used for brownout protection. If the VIN voltage is less than 0.7V, the PWM output is shut off. If the VIN is over 0.9V, the PWM output is turned on again. The hysteresis window for on/off is ~0.2V. The proprietary green-mode function provides off-time modulation to continuously decrease the switching frequency under light-load conditions. Maximum on-time is limited to provide protection against abnormal conditions. To further reduce power consumption under zero-load condition, the PWM oscillator is completely turned off and the power supply enters burst-mode. This green mode dramatically reduces power consumption under light-load and zero-load conditions. Power supplies using SG6846A can meet restrictive international regulations regarding standby power consumption. VDD Over-voltage Protection (OVP) VDD over-voltage protection is built in to prevent damage. If VDD is over 23.6V, SG6846A is latched off. Over-Temperature Protection (OTP) Oscillator Operation An external NTC thermistor can be connected from the RT pin to GND. The impedance of the NTC decreases at high temperatures. When the voltage of the RT pin drops below 1.05V, the SG6846A is turned off. For protection-mode options, see Ordering Information. A resistor connected from the RI pin to GND generates a reference current source, inside the SG6846A, used to determine the PWM frequency. Increasing the resistance decreases the amplitude of the current source and reduces the PWM frequency. Using a 26k resistor results in a corresponding 65kHz switching frequency. The relationship between RI and the switching frequency is: fPWM(kHz) 1690 R I (k ) © 2008 Fairchild Semiconductor Corporation SG6846A • Rev. 1.1.5 (2) www.fairchildsemi.com 11 Noise Immunity Noise from the current sense or the control signal may cause significant pulse-width jitter, particularly in continuous-conduction mode. Slope compensation helps alleviate this problem. Good placement and layout practices should be followed. Avoid long PCB traces and component leads. Compensation and filter components should be located near the SG6846A. Figure 20. Current Sense R-C Filter © 2008 Fairchild Semiconductor Corporation SG6846A • Rev. 1.1.5 SG6846A — Highly Integrated Green-Mode PWM Controller Operation Description (Continued) www.fairchildsemi.com 12 R16 D4 2 4 1 5 2 32V C13 11 C11 12 2 P16V P16V L2 1 C5 3 C17+ C14 + 16V 16V C15 + 1 1 C3 2 R11 2 + 2 R17 2 + 1 9 3 2 7 1 2 21 2 1 R4 32V + 10 2 D3 L4 C12 + 1 1 D1 2 2 6 D2 R9 R3 C16+ 3 R12 C4 C2 3 2 R2 R1 13 1 + R8 1 P7 P32V P32V L1 1 2 CX2 4 3 1 P2 TX1 1 VZ1 LF1 CY2 BD1 1 CX1LF2 3 4 2 CY1 1 RT1 F1 t P1 2 U1 FB 2 1 Q1 R13 8 1 2 GATE FB VDD VIN SENSE 7 L3 R6 6 1 2 3 C1 GND 3 1 1 D5 + R5 4 RI RT 5 R10 C6 R14 NTC1 R7 P16V P16V 1 4 R15 FB P16V FB C7 R18 K 2 3 U2 P32V P16V C9 P32V R19 R20 R R21 A U3 Figure 21. Application Circuit for 32V / 16V Output SG6846A — Highly Integrated Green-Mode PWM Controller Reference Circuit Bill of Materials Part No. Value Part No. Value Part No. Value R1, R2, R3, R4 470KΩ ±5% C4 103 P 630V D3 FR103 1.0A 200V R8, R9 S1MΩ ±1% C10,C11 102 P 1KV BD1 DBL406G R5 16K2Ω ±1% C6,C7 102 P 50V D4 BYT28-300 R15 1K5Ω ±5% C9 222 P 50V D5 BYV32-150 R13 10Ω ±5% C14,C17 470µ 25V F1 250V4A QUICK R18 4K7Ω ±5% C15 220µ 25V L1,L2 1.8µH R21 15KΩ ±1% C13,C16 220µ 50V L4 10µH R7 27KΩ ±5% C2 150µ 400V U3 TL431 ±1% R6 330Ω ±1% C1 4.7µ 50V U1 SG 6846 R19 102KΩ ±1% C3 10µ 50V U2 PC817 R14 0Ω22 ±5% CX1 X1 0.47µ 275V Q1 7NB60 R16, R17 1W 20Ω ±5% C8 Y2 222P 250V TX1 EI-33 R11 20KΩ ±5% C5 100µ 50V RT1 SCK053 R12 100KΩ ±5% CX2 X2 0.1µF 275V VZ1 14ψ 470V R20 887KΩ ±1% D1 1N4148 R22 10KΩ ±1% D2 BYV95C © 2008 Fairchild Semiconductor Corporation SG6846A • Rev. 1.1.5 www.fairchildsemi.com 13 5.00 4.80 A 0.65 3.81 5 8 B 6.20 5.80 PIN ONE INDICATOR 1.75 4.00 3.80 1 5.60 4 1.27 (0.33) 0.25 M 1.27 C B A LAND PATTERN RECOMMENDATION 0.25 0.10 SEE DETAIL A 1.75 MAX 0.25 0.19 C 0.10 0.51 0.33 0.50 x 45° 0.25 R0.10 SG6846A — Highly Integrated Green-Mode PWM Controller Physical Dimensions C OPTION A - BEVEL EDGE GAGE PLANE R0.10 OPTION B - NO BEVEL EDGE 0.36 NOTES: UNLESS OTHERWISE SPECIFIED 8° 0° 0.90 0.406 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 SEATING PLANE (1.04) DETAIL A SCALE: 2:1 Figure 22. 8-Pin Small Outline Package (SOP) 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/ © 2008 Fairchild Semiconductor Corporation SG6846A • Rev. 1.1.5 www.fairchildsemi.com 14 SG6846A — Highly Integrated Green-Mode PWM Controller © 2008 Fairchild Semiconductor Corporation SG6846A • Rev. 1.1.5 www.fairchildsemi.com 15