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APW7062BKC-TUL Datasheet(PDF) 6 Page - Anpec Electronics Coropration |
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APW7062BKC-TUL Datasheet(HTML) 6 Page - Anpec Electronics Coropration |
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6 / 18 page  Copyright ANPEC Electronics Corp. Rev. A.3 - Mar., 2005 APW7062B www.anpec.com.tw 6 tive divider across the output (VOUT). The output volt- age is determined by: Functional Pin Description (Cont.) UGATE (Pin9) Connect the pin to external MOSFET, and provides the gate drive for the upper MOSFET. BOOT (Pin 10) This pin provides the supply voltage to the high side MOSFET driver. For driving logic level N-channel MOSEFT, a bootstrap circuit can be used to create a suitable driver’s supply. GND (Pin7) Signal ground for the IC. PHASE (Pin8) This pin is connected to the source of the high-side MOSFET and is used to monitor the voltage drop across the high-side MOSFET for over-current protection. FB (Pin5) FB pin is the inverter input of the error amplifier. and it receives the feedback voltage from an external resis- If the FB voltage is under 50% VREF, because of the short circuit or other influence , it will cause the under voltage protection, and the device is shutdowned. Re- move the error condition and restart the VCC voltage or pull the EN from low to high once, the device can be enabled again. EN (Pin6) Pull the pin higher than 2V to enable the device, and pull the pin lower than 0.8V to shutdown the device. In shutdown, the SS is discharged and the UGATE and COMP (Pin4) t1=1.2V CSS = Soft Start Capacitor ISS = Soft Start Current = 10 µA VOSC(MIN) = Bottom of Oscillator = 1.35V VIN = Input Voltage ∆Vosc = Peak to Peak Oscillator Voltage = 1.9V ∆VOUTSteadyState = Steady State Output Voltage LGATE pins are held low. The EN pin is the open- collector, it will not be floating. Where : PGND (Pin11) Power ground for the gate diver. Connect the lower MOSFET source to this pin. This pin is the output of the error amplifier. Add an external resistor and capacitor network to provide the loop compensation for the PWM converter (see Appli- cation Information). + × = GND OUT OUT R R 1 0.8V V where ROUT is the resistor connected from VOUT to FB and RGND is the resistor connected from FB to GND. LGATE (Pin 12) Connect the pin to external MOSFET, and provides the gate drive signal for the lower MOSFET. PVCC (Pin13) This pin provides a supply voltage for the lower gate drive, connect it to VCC pin in common use. VCC (Pin14) This pin provides a supply voltage for the device, when VCC is above the rising threshold 10.4V, the device is turned on, conversely, VCC is below the falling threshold, the device is turned off. |
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