AT1454B 查看數據表（PDF） - Unspecified

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AT1454B

Preliminary Product Information Photoflash Capacitor Charger for DSC

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AT1454/AT1454A/AT1454B

Preliminary Product Information

Photoflash Capacitor Charger for DSC

Feature

• 2.5V to 5.5V Supply Voltage Operating

Range.

• Low Current Consumption:1mA in operation.

• Adjustable Output Voltage.

• Adjustable Switch On-Time.

• Charge Complete Indicator.

• Built-in IGBT Driver.

• Soft-Start Circuitry.

• Thermal Protection

• Charges Any Size Photoflash Capacitor.

• AT1454 with Auto-Refresh Function.

• AT1454A/B without Auto-Refresh Function.

• Small 10-lead MSOP Package.

Application

• Digital / Film Camera Flash

• PDA / Cell Phone Flash.

Description

The AT1454 series is a charger IC for Photoflash

capacitor with soft-start function, an IGBT driver

for igniting flash tube, adjustable output voltage

and adjustable switch on-time to perform energy

transition on each charge cycle. The output voltage

can be adjusted by simply changing the turn ratio

of transformer. AT1454B is sensed by voltage

divider connecting to the anode of the rectifying

diode. The voltage sensing path is cut off when

charging function to be completed to maintain

minimum output voltage decay.

The device allows user to control automatic refresh

rate on Charge pin. While the Ready pin signals

that the capacitor is fully charged.

AT1454/AT1454A/AT1454B is available in

MSOP-10 package.

Block Diagram

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

7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.

Tel: 886-3-563-0878 Fax: 886-3-563-0879

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

3/24/2006 REV:1.2

Email: service@aimtron.com.tw

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