YB7000
Photoflash Capacitor Charger with Automatic Refresh Description Features
YB7000 charge high voltage photoflash Charge Any Size Photoflash Capacitor capacitors quickly and efficiently. Designed Support Operation from Two AA Cells or for use in digital and film cameras, these Any Supply from 1.8V to 16V devices use flyback topology to achieve Use Standard transformers efficiencies up to four times better than No High Voltage Zener Diode Required competing flash modules. A unique peak Built in 40V output switch inductor current control mechanism maintains Adjustable Output Voltage current-limited mode transformer operation throughout the entire charge cycle, eliminating Adjustable Peak Switch Current the high inrush current often found in modules. Automatic Refresh with adjustable timer YB7000 output voltage sensing scheme Charge Complete Indicator monitors the flyback voltage to directly regulate Small 8-Lead MSOP Packages the output voltage. This feature allows the Applications capacitor to be held at a fully charged state Digital Camera Flash unit without excessive power consumption. Adjustable refresh time is fully controllable by Film Camera Flash Unit the user with a resistor. The DONE pin signals High Voltage Power Supplies that the capacitor is full charged. Photoflash module for cell phone
Typical Application Circuit
Figure 1 Typical Application Circuit
YB7000 MRev.0.3
www.yobon.com.tw
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