AT1454 Datasheet, PDF (1/18 Pages) Aimtron Technology – Photoflash Capacitor Charger for DSC

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: [phone] Fax: [phone]
WWW: http://www.aimtron.com.tw
3/24/2006 REV:1.2
Email: [e-mail]
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