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SG6859DZ Datasheet(PDF) 5 Page - Fairchild Semiconductor |
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SG6859DZ Datasheet(HTML) 5 Page - Fairchild Semiconductor |
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5 / 13 page  Product Specification Low Cost Green-Mode PWM Controller for Flyback Converters SG6859 © System General Corp. - 5 - www.sg.com.tw • www.fairchildsemi.com Version 1.2.1(IAO33.0067.B2) September 28, 2007 Feedback Input Section Symbol Parameter Test Condition Min. Typ. Max. Unit ZFB Input Impedance 5 KΩ VFB-OPEN FB Output High Voltage 5 V VFB-OL FB Open-loop Trigger Level 4.3 4.6 4.9 V tD-OLP The delay time of FB pin Open Loop Protection 56 ms VFB-N Green-Mode Entry FB Voltage 2.6 2.85 3.1 V VFB-G Green-Mode Ending FB Voltage 2.20 V SG Green-Mode Modulation Slope RI=95KΩ 40 75 100 Hz/mV Current Sense Section Symbol Parameter Test Condition Min. Typ. Max. Unit ZSENSE Input Impedance 10 KΩ tPD Delay to Output 40 55 100 ns VSTHFL Flat Threshold Voltage for Current Limit 0.91 0.96 1.01 V VSTHVA Valley Threshold Voltage for Current Limit 0.75 0.80 0.85 V tLEB Leading-Edge Blanking Time 250 300 350 ns DCYSAW Duty Cycle of SAW Limit 40 % Oscillator Section Symbol Parameter Test Condition Min. Typ. Max. Unit Center Frequency 65 70 75 FOSC Normal PWM Frequency Hopping Range RI=95KΩ ±4.9 KHz THOP Hopping Period RI=95KΩ 3.7 ms FOSC-G Green-Mode Frequency RI=95KΩ 22 KHz FDV Frequency Variation versus VDD Deviation VDD=13.5 to 22V 0 0.02 2 % FDT Frequency Variation versus Temp. Deviation TA=-20 to 85°C 2 % Output Section Symbol Parameter Test Condition Min. Typ. Max. Unit DCYMAX Maximum Duty Cycle 70 75 80 % VGATE-L Output Voltage Low VDD=15V, Io=20mA 1.5 V VGATE-H Output Voltage High VDD=13.5V, Io=20mA 8 V tr Rising Time VDD=15V, CL=1nF 150 ns tf Falling Time VDD=15V, CL=1nF 55 ns VGATE-CLAMP Output Clamp Voltage VDD=22V 16 17 18 V |
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