AIC1401CS datasheet(4/5 Pages) AIC

4 / 5 page

AIC1401

n PIN DESCRIPTIONS

PIN 1: OCSET- Current limit sense pin. Connect

a resistor ROCSET from this pin to

the

drain

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

the

following

equation:

PEAK

OCSET

DS(ON

)

If FB pin voltage is sensed to be

below

50%

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

connected

error

amplifier

output

and

PWM

comparator. A RC network is

connected

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

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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