AIC1401 Ver la hoja de datos (PDF) - Analog Intergrations

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AIC1401

PWM Step-Down Switching Controller with Shutdown

Analog Intergrations 

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

200µA current source (IOCSET),

and the external MOSFET on-

resistance (RDS(ON)) jointly set

the overcurrent trip point

according to the following

equation:

IPEAK = IOCSET × ROCSET

RDS(O N)

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

n APPLICATION CIRCUIT

Refer to TYPICAL APPLICATION CIRCUIT

AIC1401

PIN 4: FB

PIN 5: GND

PIN 6: LX

PIN 7: UG

PIN 8: VCC

comparator. A RC network is

connected to FB pin to

compensate the voltage-control

feedback loop of the converter.

- The error amplifier inverting

input pin. The FB pin and COMP

pin are used to compensate the

voltage-control feedback loop.

- Ground pin.

- Overcurrent detection pin.

Connect the LX pin to source of

the external N-MOSFET. This

pin detects the voltage drop

across the MOSFET RDS(ON) for

overcurrent protection.

- External MOSFET gate drive pin.

Connect this pin to gate of the

external MOSFET.

- The chip power supply pin.

Recommended supply voltage is

12V.

4

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