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PDF LD7268 Data sheet ( Hoja de datos )
| Número de pieza | LD7268 | |
| Descripción | Photoflash Capacitor Charger | |
| Fabricantes | Leadtrend | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LD7268 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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Photoflash Capacitor Charger
LD7268
3/21/2005
REV: 01
General Description
The LD7268 is an ideal charge control IC for flash units with
internal soft start, adjustable charging current and output
voltage. It provides a proprietary constant current charging
algorithm which charges photoflash capacitor quickly and
efficiently. Besides, the built-in totem pole IGBT driver can
drive IGBT quickly and save board space.
For phone flash applications, the input current is usually
limited at 500mA or 300mA. The LD7268 could easily meet
either 500mA or 300mA applications.
The LD7268 is available in a space-saving MSOP-10
package and is ideal for phone flash or DSC flash unit.
Features
z Adjustable charging current
z Adjustable output voltage
z Supports auto refresh
z 2.8V~5V Lithium battery voltage range
z Internal soft start
z Tiny transformer
z Totem pole IGBT driver
Applications
z DSC Flash Unit
z Phone Flash Unit
g Patented
Typical Application
VOUT
D1 T1
C2
47µF
ZD1
300V
VCC
C3
1µF
VDD
R1
100K
READY
C4 R2
0.1µF 1M
VCC OUT1
FB
RS
5.1Ω
SEC
CS
LD7268
ISET
READY
CHARGE
IGBT GATE
Q1: AOS / AO3402,
RG
OUT2
TRIGGER
GND
T1: LP=10/16.5µH, for input current =500/300mA
ZD1:Origin /FC0300M
RI =250K~450K
CS=4.7~10nF
Fig. 1 Phone Flash Application
Q1
CHARGE
TRIGGER
C1
22µF
VIN
RI
Leadtrend Technology Corporation
LD7268-DS-01 March, 2005
1
1 page  
LD7268
Electrical Characteristics
(TA = +25oC unless otherwise stated, VCC=3.3V)
PARAMETER
CONDITIONS
INPUT POWER
Operating Voltage Vcc
Standby Current Icc
Charge Off
Nominal Supply Current
FB
Reference Voltage
Reference Voltage Tolerance
Auto Refresh Ref. Voltage1
MOS Driver
Rising Time
Falling Time
IGBT Driver
VCC=3.3V,D=50%
VREF1/VREF
VCC=3.3V,CL=1nF
VCC=3.3V,CL=1nF
Output ON resistor
VCC=3.3V
Output OFF resistor
ON/OFF
Trigger On/Off
Charge On/Off
VCC=3.3V
Enable
Disable
Enable
Disable
Impedance to GND
Charge Pin to GND
Trigger Pin to GND
Others
Max Turn On Time
Ri Open
Max Turn On Time Tolerance
Propagation Delay
(Trigger=High) delay to OUT2
MIN TYP MAX UNITS
2.2 5.5 V
100 µA
0.6 mA
1.15
88
1
V
%
%
50 nS
50 nS
8 12 Ω
6 9Ω
2.0 V
0.8 V
2.0 V
0.8 V
200K
200K
Ω
Ω
5 µS
6.6 %
60 nS
Leadtrend Technology Corporation
LD7268-DS-01 March, 2005
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet LD7268.PDF ] | |
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