AIC1579 Ver la hoja de datos (PDF) - Analog Intergrations

Número de pieza

componentes Descripción

Fabricante

AIC1579

Step-Down Switching Regulator Controller

Analog Intergrations 

AIC1579/L

BLOCK DIAGRAM

SS

10µA

Soft

Start

4V

FB

COMP

REF.

Error

AMP

-

+

Over Current

Power-ON Reset

PHASE

OCSET

200µA

VCC

PWM Comparator

+

-

Oscilator

Gate

Control

UGATE

GND

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(ON)

If FB pin voltage is sensed to be

below 50% of the internal

voltage reference VDAC, the

overcurrent comparator cycles

the soft-start function.

PIN 2: SS

- Soft start pin. Connect a

capacitor from this pin to ground.

An internal 10µA current source

provides soft start function for

the converter.

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: PHASE-

Overcurrent detection pin.

Connect the PHASE pin to

source of the external N-

MOSFET. This pin detects the

voltage drop across the

MOSFET RDS(ON) for overcurrent

protection.

PIN 7: UGATE- 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.

6

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