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錛歍ypical Application Circuit
YB7000 MRev.0.3
www.yobon.com.tw
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