YB7002 Datasheet, PDF (2/8 Pages) YOBON TECHNOLOGIES,INC. – Photoflash Capacitor Charger with Automatic Refresh

Pin Description
YB7002
Photoflash Capacitor Charger with Automatic Refresh
Figure2jYB7002 MSOP10
Pin Designator
Table1j
Pin
NAME
1
PGND
2
AGND
3
V_IN
4
V_HYST
5
V_FB
6
EN
7
DONE
8
LIMIT
9
SW
10
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 bypassed capacitor to eliminate noise.
Connecting a resistor RHYST from VHYST to ground will set the refresh time.
A 13.5K resistor and RHYST form a divider circuit to restart the charging cycle
once VFB is dropping below Vhyst.
A resistor divider from VOUT to ground enables the system to sense VOUT
voltage and determine the charging and recharging cycles.
Device enable, a1.8V or above will turn on the IC. Below 0.4V will put the chip
in shut down mode.
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 peak
Switch pin current. A 11uA current going through Rlimit sets up the peak
voltage the sense node can reach (see the block diagram).
They connect to the collector of the power NPN device.
Ordering Information
Table2j
Order Number
YB7002
Package Type
MSOP10
Supplied as
2500 units Tape & Reel
Package Marking
YB7002
YB7002 MRev1.0
www.yobon.com.tw
2