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NCP5314 Datasheet(PDF) 8 Page - ON Semiconductor |
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NCP5314 Datasheet(HTML) 8 Page - ON Semiconductor |
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8 / 28 page  NCP5314 http://onsemi.com 8 PIN DESCRIPTION Pin No. Pin Symbol Pin Name Description 1−3, 30−32 VID0−VID5 DAC VID Inputs VID−compatible logic input used to program the converter output voltage. All high on VID0−VID4 generates fault. 4 PWRLS Power Good Sense Voltage sensing pin for Power Good lower threshold. 5 VFFB Fast Voltage Feedback Input of PWM comparator for fast voltage feedback, and also the inputs of Power Good sense and overvoltage protection comparators 6 SS Soft Start A capacitor between this pin and ground programs the soft start time. 7 PWRGD Power Good Output Open collector output goes high when the converter output is in regulation. 8 DRVON Drive Enable Logic high enables MOSFET drivers, and logic low turns all MOSFETs off through MOSFET drivers. Pulled to ground through internal 70 k resistor. 9 SGND Remote Sense Ground Ground connection for DAC and error amplifier. Provides remote sensing of load ground. 10 VDRP Output of Current Sense Amplifiers for Adaptive Voltage Positioning The offset above DAC voltage is proportional to the sum of inductor current. A resistor from this pin to VFB programs the amount of Adaptive Voltage Positioning. Leave this pin open for no Adaptive Voltage Positioning. 11 VFB Voltage Feedback Error amplifier inverting input. 12 COMP Error Amp Output Provides loop compensation and is clamped by SS during soft start and fault conditions. It is also the inverting input of PWM comparators. 13 CS4N Current Sense Reference Inverting input to current sense amplifier #4. 14 CS4P Current Sense Input Non−inverting input to current sense amplifier #4. 15 CS3N Current Sense Reference Inverting input to current sense amplifier #3, and Phase 3 disable pin. 16 CS3P Current Sense Input Non−inverting input to current sense amplifier #3, and Phase 3 disable pin. 17 GND Ground IC power supply return. Connected to IC substrate. 18−21 GATE4−GATE1 Channel Outputs PWM outputs to drive MOSFET driver ICs. 22 VCC IC Power Supply Power Supply Input for IC. 23 ROSC Oscillator Frequency Adjust Resistor to ground programs the oscillator frequency, as shown in Oscillator Frequency graph Figure 7. 24 ILIM Total Current Limit Resistor divider between ROSC and ground programs the average current limit. 25 CS1P Current Sense Input Non−inverting input to current sense amplifier #1. 26 CS1N Current Sense Reference Inverting input to current sense amplifier #1. 27 CS2P Current Sense Input Non−inverting input to current sense amplifier #2. 28 CS2N Current Sense Reference Inverting input to current sense amplifier #2. 29 ENABLE Enable A voltage less than the threshold puts the IC in Fault Mode, discharging SS. Connect to system VIDPWRGD signal to control powerup sequencing. Hysteresis is provided to prevent chatter. |
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