AT1452

www.DataSheet4U.com 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. General Description The AT1452 is a charger control IC for Photoflash capacitor with soft start function, adjustable maximum duty cycle, auto-refresh and autodischarge (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 Applications Digital Still Cameras flash unit Block Diagram 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 1 AT1452 Preliminary Product Information Photoflash Capacitor Charger...