DESCRIPTION
●The LT®3420/LT3420-1 charge high voltage photoflash capacitors quickly and efficiently. Designed for use in both digital and film cameras, these devices use a flyback topology to achieve efficiencies up to four times better than competing flash modules. A unique adaptive off-time
●control algorithm
● maintains current-limited continuous mode transformer operation throughout the entire charge cycle, eliminating the high inrush current often found in modules.
●FEATURES
●■ Charges 220µF to 320V in 3.7 Seconds from 5V (LT3420)
●■ Charges 100µF to 320V in 3.5 Seconds from 5V (LT3420-1)
●■ Charges Any Size Photoflash Capacitor
●■ Supports Operation from Two AA Cells or Any Supply from 1.8V to 16V
●■ Controlled Peak Switch Current: 1.4A (LT3420) 1.0A (LT3420-1)
●■ Controlled Input Current: 840mA (LT3420) 450mA (LT3420-1)
●■ Uses Standard Transformers
●■ Efficient Flyback Operation ( >75% Typical)
●■ Adjustable Output
●■ Automatic Refresh
●■ Charge Complete Indicator
●■ No High Voltage Zener Diode Required
●■ No Output Voltage Divider Required
●■ Small 10-Lead MSOP Package
●APPLICATION
●■ Digital Camera Flash Unit
●■ Film Camera Flash Unit
●■ High Voltage Power Supplies
