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PDF LD7268A Data sheet ( Hoja de datos )
| Número de pieza | LD7268A | |
| Descripción | Photoflash Capacitor Charger | |
| Fabricantes | Leadtrend | |
| Logotipo |  |
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LD7268A
3/10/2005
Photoflash Capacitor Charger for DSC
REV: 00
General Description
The LD7268A is an ideal charge control IC for flash units
with internal soft start, adjustable charging current and
output voltage. It provides a proprietary charging algorithm,
which charges photoflash capacitor quickly and efficiently.
The LD7268A could operate for constant charging current
mode or the mode with lowering the charging current at
lower battery voltage. As well, a built-in totem pole IGBT
driver can drive IGBT quickly and save the board space.
The LD7268A is available in a space-saving MSOP-10
package and is ideal for DSC flash unit.
Features
• Adjustable Charging Current
• Adjustable Output Voltage
• 1.8V~5V Battery Voltage Range
• Internal Soft Start
• Tiny Transformer
• Totem-Pole IGBT Driver
Applications
• DSC Flash Unit
• Film Camera Flash Unit
g Patent pending
Typical Application
D1 T1
C2
140µF
ZD1
300V
Vcc
C3
1µF
VDD
100nF 100K
R1
100K
READY
IGBT
GATE
RG
Q1: AOS/ AO3402
T1: 10T: 250T, LP=8µH/EFD6.5
CS: 4.7~10nF
VCC
OUT1
FB
Cs Rs
3.9Ω
SEC
ISET
CHARGE
LD7268A
READY
OUT2
TRIGGER
GND
Fig. 1
CHARGE
TRIGGER
C1
33µF
VBAT
Q1
RI
Leadtrend Technology Corporation
LD7268A-DS-00 March 2005
1
1 page  
Typical Performance Characteristics
COUT=140µF
LD7268A
VOUT
Ready
Charge
IIN
Fig. 2 Charging waveform VIN=3V, IIN=600mA
COUT=47µF
VOUT
Ready
Charge
IIN
Fig. 4 Charging Waveform VIN=3V, IIN=280mA
VOUT
Ready
Charge
IIN
Fig. 3 Charging Waveform VIN=4.2V, IIN=600mA
VOUT
Ready
Charge
IIN
Fig. 5 Charging Waveform VIN=4.2V, IIN=280mA
VOUT
Charge
IIN
Trigger
Fig. 6 Charging Waveform VIN=4.2V
VOUT=100V
VDS
Fig. 7 VDS Waveform
Leadtrend Technology Corporation
LD7268A-DS-00 March 2005
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet LD7268A.PDF ] | |
Hoja de datos destacado
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