AT1453 Ver la hoja de datos (PDF) - Unspecified

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Fabricante

AT1453

Photoflash Capacitor Charger for DSC

Unspecified 

AT1453

Preliminary Product Information

Photoflash Capacitor Charger for DSC

Features

• 2.5 to 5.5V supply voltage operating range.

• Low current consumption: 1mA in operation,

• 50 kHz or 100kHz operation frequency .

• Built-in maximum duty control.

• Push-pull output.

• Built-in soft start circuit.

• Built-in auto-discharge function.

Applications

•Digital Still Cameras flash unit

General Description

The AT1453 is a charger control IC for Photoflash

capacitor with soft start function, adjustable

maximum duty cycle and auto-discharge (soft start

capacitor) circuit. Adjustable soft start is

programmed with an external capacitor on SS pin.

The control technique allows for the use of

external resistor to change the switching duty and

use of transformer to control the input current. A

logic high on the CHARGE pin initiates charging,

while the READY pin signals that the capacitor is

fully charged. It is ideal for DSC flash unit.

* Protected by U.S. Patent #6,724,989

Block Diagram

VCC

READY

GND

CHARGE

Reference

Vref

1.1V

Output

Control

Block

Enable

Block

OUT

SS

DUTY

FB

Aimtron reserves the right without notice to change this circuitry and specifications.

2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.

Tel: 886-3-563-0878

WWW: http://www.aimtron.com.tw

Fax: 886-3-563-0879

Email: service@aimtron.com.tw

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