LT3420EMS#PBF

LINEAR TECHNOLOGY  LT3420EMS#PBF  芯片, 电容充电器

The 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.

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Charges 220µF to 320V in 3.7 seconds from 5V

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Charges any size photoflash capacitor

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Supports operation from two AA cells or any supply from 1.8 to 16V

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1.4A Controlled peak switch current

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840mA Controlled input current

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Uses standard transformers

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>75% Typical efficient flyback operation

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Adjustable output

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Automatic refresh

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Charge complete indicator

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No high voltage Zener diode required

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No output voltage divider required