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FAN5182 датащи(PDF) 3 Page - Fairchild Semiconductor |
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FAN5182 датащи(HTML) 3 Page - Fairchild Semiconductor |
3 / 19 page © 2005 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN5182 • Rev. 1.1.3 3 Pin Assignments Figure 2. Pin Assignments Pin Definitions Pin # Name Description 1 VCC Supply Voltage for the Device. 2 FBRTN Feedback Return. Voltage error amplifier reference for remote sensing of the output voltage. 3 FB Feedback Input. Error amplifier input for remote sensing of the output voltage. An external resistor divider between the output and FBRTN connected to this pin sets the output voltage. This pin is also the reference point for the power-good and crowbar comparators. 4 COMP Error Amplifier Output and Compensation Pin. 5 PWRGD Power Good Output. Open-drain output that signals when the output voltage is outside the proper operating range. 6 EN Power Supply Enable Input. Pulling this pin to GND disables the PWM outputs and pulls the PWRGD output low. 7 DELAY Soft-Start Delay and Current Limit Latch-Off Delay Setting Input. An external resistor and capacitor connected between this pin and GND sets the soft-start ramp-up time and the over- current latch-off delay time. 8 RT Frequency Setting Resistor Input. An external resistor connected between this pin and GND sets the oscillator frequency of the device. 9 RAMPADJ PWM Ramp Current Input. An external resistor from the converter input voltage to this pin sets the internal PWM ramp. 10 ILIMIT Current-Limit Set point / Enable Output. An external resistor connected from this pin to GND sets the current limit threshold of the converter. This pin is actively pulled low when the EN input is low, or when VCC is below its UVLO threshold, to signal to the driver IC that the driver high-side and low-side outputs should go low. 11 CSREF Current-Sense Reference Voltage Input. The voltage on this pin is used as the reference for the current-sense amplifier. Connect this pin to the common point of the output inductors. 12 CSSUM Current-Sense Summing Node. External resistors from each switch node to this pin sum the average inductor currents to measure the total output current. 13 CSCOMP Current-Sense Compensation Point. A resistor and a capacitor from this pin to CSSUM determine the gain of the current sense amplifier. 14 GND Ground. All internal biasing and logic output signals are referenced to this ground. 15–17 SW3 - SW1 Current Balance Inputs. These are inputs for measuring the current level in each phase. The SW pins of unused phases should be connected to ground. 18–20 PWM3 - PWM1 Logic-Level PWM Outputs. Each output is connected to the input of an external MOSFET driver, such as the FAN5109. Connecting the PWM3 output to GND causes that phase to turn off, allowing the FAN5182 to operate as a 1- or 2-phase controller. Do not connect PWM2 to ground for 1-phase operation. |
Аналогичный номер детали - FAN5182 |
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Аналогичное описание - FAN5182 |
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