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PDF YB7002 Data sheet ( Hoja de datos )
| Número de pieza | YB7002 | |
| Descripción | Photoflash Capacitor Charger | |
| Fabricantes | YOBON TECHNOLOGIES | |
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Hay una vista previa y un enlace de descarga de YB7002 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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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
1 page  
Function Block
YB7002
Photoflash Capacitor Charger with Automatic Refresh
Figure 3: Function Block
Functional Description
YB7002 employs the peak-current-limit
scheme to control the charging of the
inductor current. Once the inductor current
reaches the preset value determined by the
Limit Pin, output power NPN is shut off and
the primary side energy is delivered to the
secondary side capacitor. The discharging
time is set to be about 1μs. Once the
discharge cycle is completed, the power
NPN is on again. If the secondary side
output voltage has not yet reached the
designated value, the inductor current will
be charged up to the preset value again.
This charging and discharging sequence
will repeat itself until the output capacitor
voltage gets to the designated value and
triggers the on-off latch to hold off the
power NPN regardless the inductor current
value.
As the power switch is off, output capacitor
starts to drop slowly due to its own leakage
and the resistor divider. When VFB voltage
is below VHYST, on-off latch turns on the
power NPN again and the charging cycle is
enabled.
User is able to use resistors to set Limit Pin
value and V voltage. An 11μA current
source is coming out of the IC and going
through the limit resistor R to ground. Limit
pin voltage determines the peak inductor
current. The higher the Limit pin voltage,
the larger the peak inductor current would
be. USER MUST BE CAREFUL WITH
THE THERMAL EFFECT GENERATED
DURING THE CAPACITOR CHARGING
CYCLE. To reduce the thermal temperature,
user can lower the resistor R value to
reduce the peak inductor current.
YB7002 Rev.1.1
www.yobon.com.tw
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet YB7002.PDF ] | |
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