AIC1880 Просмотр технического описания (PDF) - Analog Intergrations

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Компоненты Описание

производитель

AIC1880

Low Noise, Step-Up PWM DC/DC Converter

Analog Intergrations 

BLOCK DIAGRAM

AIC1880

SHDN

COMP

FB

FREQ

SHUTDOWN SHUTDOWN

CONTROL

ERROR

AMPLIFIER

1.24V

UNDER VOLTAGE

LOCK OUT

UVLO

SOFT-

START

ERROR

COMPARATOR

CONTROL

AND

1

N

DRIVER

CLOCK

LOGIC

OSCI-

LLATOR

SLOPE

COMPEN-

SATION

CURRENT

SENSE

RSENSE

VIN

SS

LX

GND

PIN DESCRIPTIONS

PIN 1: COMP - Compensation Pin for Error Am-

plifier.

PIN 2: FB

- Feedback Pin with a typical ref-

erence voltage of 1.24V.

PIN 3: SHDN

PIN 4:GND

PIN 5: LX

PIN 6: VIN

- Shutdown Control Pin. The De-

vice will turn off when SHDN is

Low.

- Ground.

- Switch Pin.

- Power Supply Pin.

PIN 7: FREQ

PIN 8: SS

- Frequency Select Pin. Oscillator

frequency is 640kHz when

FREQ connects to GND, and

1.2MHz when FREQ connects

to VIN.

- Soft-Start Control Pin. Connect a

soft-start capacitor to this pin. A

4µA constant current charges

the soft-start capacitor. Leave

open for no soft-start.

6

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