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AIC1401CS Datasheet(PDF) 4 Page - Analog Intergrations Corporation |
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AIC1401CS Datasheet(HTML) 4 Page - Analog Intergrations Corporation |
4 / 5 page AIC1401 4 n PIN DESCRIPTIONS PIN 1: OCSET- Current limit sense pin. Connect a resistor ROCSET from this pin to the drain of the external MOSFET. ROCSET, an internal 200 µA current source (I OCSET), and the external MOSFET on- resistance (RDS(ON)) jointly set the overcurrent trip point according to the following equation: I I R R PEAK OCSET OCSET DS(ON = × ) If FB pin voltage is sensed to be below 50% of the internal voltage reference, the overcurrent comparator cycles the soft-start function. PIN 2: /SHDN - Shutdown pin. Connect this pin to ground for shutdown. PIN 3: COMP - External compensation pin. This pin is connected to error amplifier output and PWM comparator. A RC network is connected to FB pin to compensate the voltage-control feedback loop of the converter. PIN 4: FB - The error amplifier inverting input pin. The FB pin and COMP pin are used to compensate the voltage-control feedback loop. PIN 5: GND - Ground pin. PIN 6: LX - Overcurrent detection pin. Connect the LX pin to source of the external N-MOSFET. This pin detects the voltage drop across the MOSFET R DS( ON) for overcurrent protection. PIN 7: UG - External MOSFET gate drive pin. Connect this pin to gate of the external MOSFET. PIN 8: VCC - The chip power supply pin. Recommended supply voltage is 12V. n APPLICATION CIRCUIT Refer to TYPICAL APPLICATION CIRCUIT |
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