Description

The A8425 charges photoflash capacitors for digital cameras, camcorders, and DSC combos. An integrated 55 V DMOS switch drives the transformer in a flyback topology optimized for 2-cell Li+ battery input. An integrated IGBT driver with separate source and sink pins allows high performance red-eye reduction implementation.

Features and Benefits

▪ Wide battery voltage range: 1.5 to 11 V

▪ Integrated 55 V DMOS switch in very thin profile

3 mm × 3 mm, 0.75 mm nominal height package

▪ Peak current limit continuously adjustable from 1.0 to 3.2 A

▪ Output voltage sensing on primary side: no resistor divider

required

▪ >75 efficiency

▪ Fast charge time

▪ Charge Complete indication

▪ Flexible, high current IGBT drive

▪ Independent IGBT driver supply

▪ Separate sink and source pins with 6 Ω pull-up and

20 Ω pull-down

▪ Interlocked trigger pin improves noise immunity

▪ No primary-side Schottky diode needed

Applications include:

▪ SLR camera flash

▪ Digital camcorder/DSC combo flash

▪ 2 Li+ input strobe