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FAN6751MR Datasheet(PDF) 6 Page - Fairchild Semiconductor |
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FAN6751MR Datasheet(HTML) 6 Page - Fairchild Semiconductor |
6 / 13 page © 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN6751MR • Rev. 1.0.0 6 Electrical Characteristics VDD=15V, TA=25°C, unless otherwise noted. Symbol Parameter Conditions Min. Typ. Max. Units Feedback Input Section AV Input Voltage to Current-Sense Attenuation 1/4.5 1/4.0 1/3.5 V/V ZFB Input Impedance 4 7 kΩ VFB-OPEN Output High Voltage FB Pin Open 5.5 V VFB-OLP FB Open-loop Trigger Level 5.0 5.2 5.4 V tD-OLP Delay Time of FB Pin Open-loop Protection 56 ms VFB-N Green-Mode Entry FB Voltage 2.1 V VFB-G Green-Mode Ending FB Voltage 1.6 V VFB-ZDC Zero Duty-Cycle Input Voltage 1.1 V Current-Sense Section ZSENSE Input Impedance 12 KΩ VTH-P at VIN=1V Threshold Voltage for Current Limit VIN=1V 0.80 0.83 0.86 V VTH-P at VIN=3V Threshold Voltage for Current Limit VIN=3V 0.67 0.70 0.73 V tPD Delay to Output 100 200 ns tLEB Leading-Edge Blanking Time 230 280 330 ns VS-SCP Threshold Voltage for SENSE Short- Circuit Protection 0.10 0.15 0.20 V tD-SSCP Delay Time for SENSE Short-Circuit Protection VSENSE<0.15V 100 150 200 µs TSS Period During Soft-Startup Time Startup Time 4.5 5.0 5.5 ms Figure 5. VFB vs. PWM Frequency PWM Frequency fOSC fOSC-G VFB-N VFB-G VFB-ZDC VFB |
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