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SG5851A Datasheet(PDF) 5 Page - Fairchild Semiconductor |
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SG5851A Datasheet(HTML) 5 Page - Fairchild Semiconductor |
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5 / 12 page  © 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com SG5851A • Rev. 1.0.0 5 Electrical Characteristics VDD=15V, TA=25°C, unless otherwise noted. Symbol Parameter Conditions Min. Typ. Max. Units VDD Section VDD-OP Continuous Operation Voltage 22 V VDD-ON Turn-on Threshold Voltage 15.5 16.5 17.5 V VDD-OFF Turn-off Threshold Voltage 10.5 11.5 12.5 V IDD-ST Startup Current VDD=VDD-ON – 0.1V 9 15 µA IDD-OP Operating Supply Current VDD=15V, GATE with 1nF to GND 3.0 3.5 mA VDD-OVP VDD Over-Voltage Protection Level Auto Restart 24 25 26 V tD-VDDOVP VDD Over-Voltage Protection Debounce Auto Restart 100 µs Feedback Input Section VFB-OPEN FB Output High Voltage 5 V VFB-OL FB Open-loop Trigger Level 4.3 4.6 4.9 V tD-OLP Delay Time of FB Pin Open-Loop Protection 56 ms VFB-N Green-Mode Entry FB Voltage 2.60 2.85 3.10 V VFB-G Green-Mode Ending FB Voltage 2.2 V SG Green-Mode Modulation Slope RI=95KΩ 40 70 100 Hz/mV VOZ-OFF FB Threshold Voltage for Zero-Duty 1.75 V Current-Sense Section ZSENSE Input Impedance 10 KΩ tPD Delay to Output VDD=13.5 to 22V 40 55 100 ns VSTHFL Flat Threshold Voltage for Current Limit 1 V VSTHVA Valley Threshold Voltage for Current Limit 0.75 0.80 0.85 V tLEB Leading-Edge Blanking Time 250 310 370 ns DCYSAW Duty Cycle of SAW Limit Maximum Duty Cycle 45 % Oscillator Section Center Frequency 65 70 75 fOSC 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 vs. VDD Deviation VDD=13.5 to 22V 0 0.2 2.0 % fDT Frequency Variation vs. Temperature Deviation TA=-20 to +85°C 2 % Continued on the following page… |
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