LTC3406B Datasheet PDF - Linear Technology

●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