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AIC1571CS Datasheet(PDF) 9 Page - Analog Intergrations Corporation |
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AIC1571CS Datasheet(HTML) 9 Page - Analog Intergrations Corporation |
9 / 18 page AIC1571 9 Pin 9: SS: Soft-start pin. Connect a ca- pacitor from this pin to ground. This capacitor, along with an in- ternal 10 µA (typically) current source, sets the soft-start inter- val of the converter. Pulling this pin low will shut down the IC. Pin 10: RT: Frequency adjustment pin. Con- necting a resistor (RT) from this pin to GND, increasing the fre- quency. Connecting a resistor (RT) from this pin to VCC, de- creasing the frequency by the following figure (Fig.3). Pin 11: FB2: Connect this pin to a resistor di- vider to set the linear controller output voltage. Pin 12: VIN2: This pin is used to monitor the 3.3V supply. If, following a start- up cycle, the voltage drops be- low 2.6V (typically), the chip shuts down. A new soft-start cy- cle is initiated upon return of the 3.3V supply above the under- voltage threshold. Pin 13: GATE2: Linear Controller output drive pin. This pin can drive either a Dar- lington NPN transistor or a N- channel MOSFET. Pin 14: GND: Signal GND for IC. All voltage levels are measured with re- spect to this pin. Pin 15: GATE3: Linear Controller output drive pin. This pin can drive either a Dar- lington NPN transistor or a N- channel MOSFET. Pin 16: FB3: Negative feedback pin for the linear controller error amplifier connect this pin to a resistor di- vider to set the linear controller output voltage. Pin 17: COMP1: External compensation pin. This pin is connected to error ampli- fier output and PWM comparator. An RC network is connected to FB1 in to compensate the volt- age control feedback loop of the converter. Pin 18: FB1: The error amplifier inverting in- put pin. the FB1 pin and COMP1 pin are used to compensate the voltage-control feedback loop. Pin 19: VSEN: Converter output voltage sense pin. Connect this pin to the con- verter output. The PGOOD and OVP comparator circuits use this signal to report output volt- age status and for over-voltage protection function. Pin 20: OCSET: Current limit sense pin. Connect a resistor ROCSET from this pin to the drain of the external high- side N-MOSFET. ROCSET, an in- ternal 200 µA current source (IOCSET), and the upper N- MOSFET on-resistance (RDS(ON)) set the over-current trip point according to the following equa- tion: I IR R PEAK OCSET OCSET DS(ON) = × Pin 21: PGND: Driver power GND pin. PGND should be connected to a low impedance ground plane in close to lower N-MOSFET source. Pin 22: LGATE: Lower N-MOSFET gate drive pin. Pin 23: PHASE: Over-current detection pin. Con- nect the PHASE pin to source of the external high-side N- MOSFET. This pin detects the voltage drop across the high- side N-MOSFET RDS(ON) for over-current protection. Pin 24: UGATE: External high-side N-MOSFET gate drive pin. Connect UGATE to gate of the external high-side N-MOSFET. |
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