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AT1452

Photoflash Capacitor Charger for DSC

Unspecified 

AT1452

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.

• Built-in auto-refresh function.

Applications

•Digital Still Cameras flash unit

Block Diagram

General Description

The AT1452 is a charger control IC for Photoflash

capacitor with soft start function, adjustable

maximum duty cycle, auto-refresh 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.

Automatic refresh allows the capacitor to remain

charged while output voltage dropped 10%. 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

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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