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YOBON TECHNOLOGIES
YOBON TECHNOLOGIES


YB7002

Photoflash Capacitor Charger



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YB7002 pdf
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
1



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YB7002 pdf
YB7002
Photoflash Capacitor Charger with Automatic Refresh
Pin Configuration
PGND 1
AGND 2
VIN 3
VHYST 4
VFB 5
MSOP10
10 SW
9 SW
8 LIMIT
7 DONE
6 EN
Figure 2: Pin Configuration
Pin Description
Table 1
Pin
1
2
3
NAME
PGND
AGND
VIN
Description
Power Ground, tie solidly to system ground of the board.
Analog Ground, tie solidly to system ground of the board.
Input supply pin. Must be locally connected to bypassed capacitor to
eliminate noise.
Connecting a resistor RHYST from VHYST to ground will set the refresh
4 VHYST time. A 13.5Kresistor and RHYST form a divider circuit to restart the
charging cycle once VFB is dropping below VHYST.
5
VFB
A resistor divider from VOUT to ground enables the system to sense
VOUT voltage and determine the charging and recharging cycles.
6
EN
Device Enable, a 1.8V or above will turn on the IC. Below 0.4V will put
the chip in shut down mode.
7
DONE
Once VOUT voltage reaches above the designated value, DONE pin will
be pulled low to indicate charging is completed.
Tie a resistor Rlimit from Limit to ground will adjust the value of the
8 LIMIT peak Switch pin current. An 11μA current going through Rlimit sets up
the peak voltage the sense node can reach (see the block diagram).
9, 10 SW They connect to the collector of the power NPN device.
Ordering Information
Order Number Package Type
YB7002
MSOP10
Supplied As
2500 units Tape & Reel
Package Marking
Please contact sales
representative
YB7002 Rev.1.1
www.yobon.com.tw
2



Part Number YB7002
Description Photoflash Capacitor Charger
Maker YOBON TECHNOLOGIES - YOBON TECHNOLOGIES
Total Page 9 Pages
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