AIC1341CS Ver la hoja de datos (PDF) - Analog Intergrations

Número de pieza

componentes Descripción

Lista de partido

AIC1341CS

High Performance, Triple-Output, Auto-Tracking Combo Controller

Analog Intergrations 

AIC1341

n PIN DESCRIPTIONS

Pin 1:

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 2:

UGATE: External high-side N-MOSFET

gate drive pin. Connect UGATE

to gate of the external high-side

N-MOSFET.

Pin 3: SD:

To shut down the system, active

high or floating. If connecting a

resistor to ground, keep the re-

sistor less than 4.7KΩ

Pin 4: VCC:

Pin 5: SS:

The chip power supply pin. It also

provides the gate bias charge for

all the MOSFETs controlled by

the IC. Recommended supply

voltage is 12V.

Soft-start pin. Connect a capaci-

tor from this pin to ground. This

capacitor, along with an internal

10µA (typically) current source,

sets the soft-start interval of the

converter.

Pulling this pin low will shut down

the IC.

Pin 6: FB2:

Connect this pin to a resistor di-

vider to set the linear regulator

output voltage.

Pin 7: VIN2:

This pin supplies power to the

internal regulator. Connect this

pin to a suitable 3.3V source.

Additionally, this pin is used to

monitor the 3.3V supply. If, fol-

lowing a start-up cycle, the volt-

age drops below 2.6V (typically),

the chip shuts down. A new soft-

start cycle is initiated upon re-

turn of the 3.3V supply above

the under-voltage threshold.

Pin 8:

GATE2: Linear Controller output drive pin.

This pin can drive either a Dar-

lington NPN transistor or a N-

channel MOSFET.

Pin 9: GND:

Signal GND for IC. All voltage

levels are measured with respect

to this pin.

Pin 10: GATE3: Linear Controller output drive pin.

This pin can drive either a Dar-

lington NPN transistor or an N-

channel MOSFET.

Pin 11: 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 12: COMP1 External compensation pin. This

pin is connected to error ampli-

fier output and PWM comparator.

A RC network is connected to

FB1 to compensate the voltage

control feedback loop of the con-

verter.

Pin 13: FB1

The error amplifier inverting input

pin. The FB1 pin and COMP1 pin

are used to compensate the volt-

age-control feedback loop.

Pin 14: OCSET: Current limit sense pin. Connect

a resistor ROCSET from this pin to

the drain of the external high-side

N-MOSFET. ROCSET, an internal

200µA current source (IOCSET),

and the upper N-MOSFET on-

resistance (RDS(ON)) set the over-

current trip point according to the

following equation:

IPEAK = IOCSET × ROCSET

RDS(ON)

5

Share Link: