AIC1571CS 데이터 시트보기 (PDF) - Analog Intergrations

부품명

상세내역

제조사

AIC1571CS

5-bit DAC, Synchronous PWM Power Regulator with Dual Linear Controllers

Analog Intergrations 

AIC1571

Pin 9: SS:

Soft-start pin. Connect a ca-

pacitor from this pin to ground.

This capacitor, along with an in-

ternal 10µA (typically) current

source, sets the soft-start inter-

val of the converter.

Pulling this pin low will shut

down the IC.

Pin 10: RT:

Frequency adjustment pin. Con-

necting a resistor (RT) from this

pin to GND, increasing the fre-

quency. Connecting a resistor

(RT) from this pin to VCC, de-

creasing the frequency by the

following figure (Fig.3).

Pin 11: FB2:

Connect this pin to a resistor di-

vider to set the linear controller

output voltage.

Pin 12: VIN2:

This pin is used to monitor the

3.3V supply. If, following a start-

up cycle, the voltage drops be-

low 2.6V (typically), the chip

shuts down. A new soft-start cy-

cle is initiated upon return of the

3.3V supply above the under-

voltage threshold.

Pin 13: GATE2: Linear Controller output drive pin.

This pin can drive either a Dar-

lington NPN transistor or a N-

channel MOSFET.

Pin 14: GND:

Signal GND for IC. All voltage

levels are measured with re-

spect to this pin.

Pin 15: GATE3: Linear Controller output drive pin.

This pin can drive either a Dar-

lington NPN transistor or a N-

channel MOSFET.

Pin 16: 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 17: COMP1: External compensation pin. This

pin is connected to error ampli-

fier output and PWM comparator.

An RC network is connected to

FB1 in to compensate the volt-

age control feedback loop of the

converter.

Pin 18: FB1:

The error amplifier inverting in-

put pin. the FB1 pin and COMP1

pin are used to compensate the

voltage-control feedback loop.

Pin 19: VSEN:

Converter output voltage sense

pin. Connect this pin to the con-

verter output. The PGOOD and

OVP comparator circuits use

this signal to report output volt-

age status and for over-voltage

protection function.

Pin 20: OCSET: Current limit sense pin. Connect

a resistor ROCSET from this pin to

the drain of the external high-

side N-MOSFET. ROCSET, an in-

ternal 200µA current source

(IOCSET), and the upper N-

MOSFET on-resistance (RDS(ON))

set the over-current trip point

according to the following equa-

tion:

IPEAK

=

IOCSET × ROCSET

RDS(ON)

Pin 21: PGND:

Driver power GND pin. PGND

should be connected to a low

impedance ground plane in

close to lower N-MOSFET

source.

Pin 22: LGATE: Lower N-MOSFET gate drive pin.

Pin 23: 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 24: UGATE: External high-side N-MOSFET

gate drive pin. Connect UGATE

to gate of the external high-side

N-MOSFET.

9

Share Link: