The LT3420EMS#PBF is a Photoflash Capacitor Charger with automatic refresh charges high voltage photoflash capacitors quickly and efficiently. Designed for use in both digital and film cameras, it uses a flyback topology to achieve efficiencies up to four times better than competing flash modules. An 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. This feature allows the capacitor to be held at a fully charged state without excessive power consumption. Automatic refresh allows the capacitor to remain charged while consuming an average input current of about 2mA, at an user-defined refresh rate. Logic high on the CHARGE pin initiates charging, while the DONE pin signals that the capacitor is fully charged.
- Charges 220μF to 320V in 3.7 seconds from 5V
- Charges any size photoflash capacitor
- Supports operation from two AA cells or any supply from 1.8 to 16V
- 1.4A Controlled peak switch current
- 840mA Controlled input current
- Uses standard transformers
- >75% Typical efficient flyback operation
- Adjustable output
- Automatic refresh
- Charge complete indicator
- No high voltage Zener diode required
- No output voltage divider required
成像, 视频和目视, 消费电子产品, 电源管理
(EN)
