AIC1896 Просмотр технического описания (PDF) - Analog Intergrations

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Компоненты Описание

производитель

AIC1896

1. 4MHz Thin Package Current-Mode Step-Up DC/DC Converter

Analog Intergrations 

AIC1896

BLOCK DIAGRAM

VIN

Control

PWM/PFM

I9

R3

Soft Start

SS

R4

PWM

4µA

Error Amp

Comparator

-

+

+

Control

Driver

Q1

-

Logic

FB

Q2

RC

1

8

SHDN

R1

CC

1.4MHz

LX

Oscillator

x1

R2

Slope Compensation

x20

Current AMP x 5

+

RS

-

GND

PIN DESCRIPTIONS

PIN 1: LX

- Power Switching Connection.

Connect LX to inductor and

output rectifier. Keep the

distance

between

the

components as close to LX as

possible.

PIN 2: GND - Ground.

PIN 3: FB

- Feedback Input. Connect a

resistive voltage-divider from the

output to FB to set the output

voltage.

PIN 4:

SHDN -

Shutdown Input. Drive SHDN

low to turn off the converter. To

automatically start the converter,

connect SHDN to IN. Drive

PIN 5: SS

PIN 6: IN

SHDN with a slew rate of

0.1V/µs or greater. Do not leave

SHDN unconnected. SHDN

draws up to 50µA.

- Soft-Start Input. Connect a

soft-start capacitor from SS to

GND in order to soft-start the

converter. Leave SS open to

disable the soft-start function.

- Internal Bias Voltage Input.

Connect IN to the input voltage

source. Bypass IN to GND with

a capacitor sitting as close to IN

as possible.

8

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