PDF SG6859A Data sheet ( Hoja de datos )

Número de pieza	SG6859A
Descripción	Low Cost Green-Mode PWM Controller
Fabricantes	Fairchild Semiconductor
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No Preview Available ! www.DataSheet4U.com March 2008 SG6859A Low-Cost, Green-Mode PWM Controller for Flyback Converters Features Green-Mode PWM Supports the “Blue Angel” Standard Low Start-up Current: 9μA Low Operating Current: 3mA Leading-Edge Blanking Constant Output Power Limit Universal Input Built-in Synchronized Slope Compensation Current-Mode Operation Cycle-by-cycle Current Limiting Under-Voltage Lockout (UVLO) Programmable PWM Frequency with Frequency Hopping VDD Over-Voltage Protection (Auto Restart) Gate Output Voltage Clamped at 17V Low Cost Few External Components Required Small SOT-26 Package Description This highly integrated PWM controller provides several enhancements designed to meet the low standby-power needs of low-power SMPS. To minimize standby power consumption, the proprietary green-mode function provides off-time modulation to linearly decrease the switching frequency under light-load conditions. This green-mode function enables the power supply to meet even the strictest power conservation requirements. The BiCMOS fabrication process enables reducing the start-up current to 9μA and the operating current to 3mA. To further improve power conservation, a large start-up resistance can be used. Built-in synchronized slope compensation ensures the stability of peak current mode control. Proprietary internal compensation provides a constant output power limit over a universal AC input range (90VAC to 264VAC). Pulse-by-pulse current limiting ensures safe operation during short-circuits. To protect the external power MOSFET from damage by supply over voltage, the SG6859A’s output driver is clamped at 17V. SG6859A controllers can be used to improve the performance and reduce the production cost of power supplies. The best choice for replacing linear and RCC-mode power adapters, the SG6859A is available in 8-pin DIP and 6-pin SOT-26 packages. Applications General-purpose switching mode power supplies and flyback power converters, such as: Battery chargers for cellular phones, cordless phones, PDAs, digital cameras, and power tools Power adapters for ink jet printers, video game consoles, and portable audio players Open-frame SMPS for TV/DVD standby and auxiliary supplies, home appliances, and consumer electronics Replacements for linear transformers and RCC SMPS PC 5V standby power Ordering Information Part Number Operating Temperature Range SG6859ATZ SG6859ADZ -20°C to +85°C -20°C to +85°C All packages are lead free per JEDEC: J-STD-020B standard. © 2007 Fairchild Semiconductor Corporation SG6859A Rev. 1.0.0 Package SOT-26 DIP-8 Packing Method Tape & reel Tube www.fairchildsemi.com 1 page Electrical Characteristics wwwU.DnaletasSshoeteht4eUrw.cisoemnoted, VDD=15V and TA=25°C. Symbol Parameter VDD Section VDD-OP Continuously Operation Voltage VDD-ON Turn-on Threshold Voltage VDD-OFF Turn-off Threshold Voltage IDD-ST Startup Current IDD-OP Operating Supply Current VDD-OVP VDD Over-voltage Protection Level tD-VDDOVP VDD Over-voltage Protection Debounce VDD-G OFF VDD Low-threshold Voltage to Exit Green-off Mode Feedback Input Section ZFB Input Impedance VFB-OPEN FB Output High Voltage VFB-OL FB Open-loop Trigger Level tD-OLP Delay of FB Pin Open-loop Protection VFB-N Green-Mode Entry FB Voltage VFB-G Green-Mode Ending FB Voltage SG Green-Mode Modulation Slope Current-Sense Section ZSENSE Input Impedance tPD Delay to Output VSTHFL Flat Threshold Voltage for Current Limit VSTHVA Valley Threshold Voltage for Current Limit tLEB Leading-Edge Blanking Time DCYSAW Duty Cycle of SAW Limit Oscillator Section FOSC Frequency Center Frequency Hopping Range THOP FOSC-G Hopping Period Green-Mode Frequency FDV Frequency Variation vs. VDD Deviation FDT Frequency Variation vs. Temperature Deviation Output Section DCYMAX VGATE-L VGATE-H tr tf VGATE- CLAMP Maximum Duty Cycle Output Voltage Low Output Voltage High Rising Time Falling Time Output Clamp Voltage Conditions VDD=VDD-ON – 0.1V VDD=15V, CL=1nF Auto Restart Auto Restart RI=95kΩ RI=95kΩ RI=95kΩ RI=95kΩ VDD=13.5 to 22V TA=-20 to 85°C VDD=15V, Io=20mA VDD=13.5V, Io=20mA VDD=15V, CL=1nF VDD=15V, CL=1nF VDD=22V Min. 15.5 8.5 24 5 4.3 2.60 40 10 40 0.75 270 65 0 62 8 16 Typ. Max. Units 16.5 9.5 9 3.0 25 125 VDD-OFF +1 22 17.5 10.5 15 3.5 26 V V V μA mA V μs V 5 kΩ V 4.6 4.9 V 56 ms 2.85 3.10 V 2.2 V 75 100 Hz/mV 55 100 1 0.80 0.85 320 370 40 kΩ ns V V ns % 70 75 ±4.9 kHz 3.7 ms 20 kHz 0.02 2.00 % 2% 67 72 1.4 150 55 17 18 % V V ns ns V © 2007 Fairchild Semiconductor Corporation SG6859A Rev. 1.0.0 5 www.fairchildsemi.com 5 Page Physical Dimensions (Continued) www.DataSheet4U.com D b 6 4 Detail A 1 e3 e1 1 c R1 R L L1 1 Detail A Figure 16. 6-Pin SOT-26 Package Dimensions Symbol A A1 A2 b c D E E1 e e1 L L1 L2 R R1 θ° θ1° Millimeters Min. Typ. 0.90 1.15 0.30 0.08 2.90 2.80 1.60 0.95 1.90 0.30 0.45 0.60 0.25 0.10 0.10 0° 4° 5° 10° Max. 1.45 0.15 1.30 0.50 0.22 0.60 0.25 8° 15° Inches Min. 0.036 0.011 0.003 0.020 0.004 0.004 0° 5° Typ. 0.045 0.114 0.110 0.063 0.037 0.075 0.018 0.024 0.010 4° 10° Max. 0.057 0.006 0.051 0.020 0.009 0.024 0.010 8° 15° © 2007 Fairchild Semiconductor Corporation SG6859A Rev. 1.0.0 11 www.fairchildsemi.com 11 Page

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