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FAN50FC3 Datasheet(PDF) 3 Page - Fairchild Semiconductor |
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FAN50FC3 Datasheet(HTML) 3 Page - Fairchild Semiconductor |
3 / 21 page © 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN50FC3 Rev. 1.0.0 3 of 21 Pin Assignments 16 15 14 13 12 11 10 9 25 26 27 28 29 30 31 32 VOSADJ OD# GND CSCOMP CSSUM CSREF RAMPADJ RT VID6 VID5 VID4 VID3 VID2 VID1 VID0 VIDSEL FAN50FC3 Exposed Paddle on Bottom of Package Figure 2. Pin Assignments Pin Definitions Pin # Name Description 1 EN Power Supply Enable Input. Analog comparator input with hysteresis. If the input voltage is higher than the internal threshold, the controller is enabled; if lower, the controller is disabled. 2 PWRGD Power Good Output. Open-drain output that pulls to GND when the output voltage is outside the proper operating range. 3 FBRTN Feedback Return. VID DAC and error amplifier reference for remote sensing output voltage. 4 FB Feedback Input. Error amplifier input for remote sensing output voltage. A positive internal current source is connected to this pin to allow the output voltage to be offset lower than the DAC voltage. 5 COMP Error Amplifier Output. For loop compensation. 6 SS Soft-Start Input. An external capacitor connected between this pin and GND sets the soft-start ramp-up time. 7 DELAY Delay Timer Input. An external capacitor connected between this pin and GND sets the over-current latch-off delay time, BOOT voltage hold time, EN delay time, and PWRGD delay time. 8 ILIMIT Current Limit Set. An external resistor from this pin to GND sets the current limit threshold of the converter. 9 RT Frequency Set Input. An external resistor connected between this pin and GND sets the oscillator frequency of the device. 10 RAMPADJ PWM Ramp Set Input. An external resistor connected between this pin and the converter input voltage sets the internal PWM ramp. 11 CSREF Current-Sense Amplifier Positive Input. The voltage on this pin is used as the reference for the current-sense amplifier. The Power Good and Crowbar functions are internally connected to this pin. 12 CSSUM Current-Sense Amplifier Negative Input. 13 CSCOMP Current-Sense Amplifier Compensation Output. |
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