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FAN5307S15X Datasheet(PDF) 8 Page - Fairchild Semiconductor |
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FAN5307S15X Datasheet(HTML) 8 Page - Fairchild Semiconductor |
8 / 13 page 8 www.fairchildsemi.com FAN5307 Rev. 1.0.4 N-channel rectifier switch. The device stays in sleep mode until the output voltage falls below the low thresh- old. The FAN5307 enters the PWM mode as soon as the output voltage can no longer be regulated in PFM with constant peak current. 100% Duty Cycle Operation As the input voltage approaches the output voltage and the duty cycle exceeds the typical 95%, the converter turns the P-channel transistor continuously on. In this mode the output voltage is equal to the input voltage minus the voltage drop across the P-channel transistor: VOUT = VIN – ILOAD × (RdsON + RL), where RdsON = P-channel switch ON resistance ILOAD = Output current RL = Inductor DC resistance Soft Start The FAN5307 has an internal soft-start circuit that limits the inrush current during start-up. This prevents possible voltage drops of the input voltage and eliminates the out- put voltage overshoot. The soft-start is implemented as a digital circuit increasing the switch current in four steps to the P-channel current limit (520mA). Typical start-up time for a 10µF output capacitor and a load current of 200mA is 500µs. Short-Circuit Protection The switch peak current is limited cycle by cycle to a typ- ical value of 520mA. In the event of a output voltage short circuit the device operates at minimum duty cycle, therefore the average input current is typically 100mA. |
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