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PDF LD7261A Data sheet ( Hoja de datos )
| Número de pieza | LD7261A | |
| Descripción | Photoflash Capacitor Charger | |
| Fabricantes | Leadtrend | |
| Logotipo |  |
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LD7261A
3/10/2005
Photoflash Capacitor Charger for DSC
Target Spec. REV: 00
General Description
The LD7261A 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 LD7261A is specially designed for automatically and
linearly 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 LD7261A 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
VOUT
C2
140µF
ZD1
300V
D1 T1
VCC
C3
1µF
VIN
C1
33µF
VDD
VCC OUT1
FB
100nF 100K
R1
100K
READY
IGBT RG
GATE
SEC
ISET
RS CS
3.9Ω
LD7261A
CHARGE
READY
OUT2
TRIGGER
GND
Q1: AOS / AO3402,
T1: 10T: 250T, LP=8µH / EFD 6.5
CS: 4.7~10nF
Fig. 1
CHARGE
TRIGGER
Q1
RI
Leadtrend Technology Corporation
LD7261A-DS-00 March 2005
1
1 page  
Typical Performance Characteristics
COUT=140µF
VOUT
Ready
LD7261A
VOUT
Ready
Charge
IIN
Charge
IIN
Fig. 2 Charging Waveform VIN=3V
Fig. 3 Charging Waveform VIN=1.8V
VOUT
Trigger
Charge
IIN
Fig. 4 Charging Waveform VIN=3V
VOUT=300V
VDS
Fig. 6 VDS Waveform
VOUT=100V
VDS
Fig. 5 VDS Waveform
VOUT=300V
VSEC
Fig. 7 VSEC Waveform
Leadtrend Technology Corporation
LD7261A-DS-00 March 2005
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet LD7261A.PDF ] | |
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