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PDF ( 数据手册 , 数据表 ) YB7002

零件编号 YB7002
描述 Photoflash Capacitor Charger
制造商 YOBON TECHNOLOGIES
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YB7002 数据手册, 描述, 功能
YB7002
Photoflash Capacitor Charger with Automatic Refresh
Description
YB7002 charge high voltage photoflash
capacitors quickly and efficiently.
Designed for use in digital and film
cameras, these devices use flyback
topology to achieve efficiencies up to four
times better than the competing flash
modules. A unique peak inductor current
control
mechanism
maintains
current-limited mode transformer operation
throughout the entire charge cycle,
eliminating the high inrush current often
found in flash modules.
YB7002 output voltage sensing scheme
monitors the flyback voltage to directly
regulate the output voltage. This feature
allows the capacitor to be held at a fully
charged state without excessive power
consumption. Adjustable refresh time is
fully controllable by the user with a resistor.
The DONE pin signals that the capacitor is
full charged.
Features
„ Charge Any Size Photoflash Capacitor
„ Support Operation from Two AA Cells or
Any Supply from 1.8V to 16V
„ Use Standard Transformers
„ No High Voltage Zener Diode Required
„ Built in 40V Output Switch
„ Adjustable Output Voltage
„ Adjustable Peak Switch Current
„ Automatic Refresh with Adjustable Timer
„ Charge Complete Indicator
„ Small 10-Lead MSOP Packages
Applications
„ Digital Camera Flash unit
„ Film Camera Flash Unit
„ High Voltage Power Supplies
Typical Application Circuit
YB7002 Rev.1.1
Figure 1: Typical Application Circuit
www.yobon.com.tw
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YB7002 pdf, 数据表
YB7002
Photoflash Capacitor Charger with Automatic Refresh
Layout consideration
The input bypass capacitor C2 must be
placed close to the IC. This will reduce
copper trace resistance which effect input
voltage ripple of the IC.
The capacitor, C1, should also be placed
close to the transformer T1. The copper
trace connections for the C1, T1, and the
YB7002 should be kept short as possible to
eliminate over-voltage condition on SW pin
due to leakage inductance of T1.
For improved thermal performance can
increase the top side copper to dissipate
heat from the package. Numerous vias
from the ground connection to the internal
ground plane located underneath the
package will help.
YB7002 Rev.1.1
www.yobon.com.tw
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