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PDF LD7261 Data sheet ( Hoja de datos )
| Número de pieza | LD7261 | |
| Descripción | Photoflash Capacitor Charger | |
| Fabricantes | Leadtrend | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LD7261 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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Photoflash Capacitor Charger
LD7261
3/21/2005
REV: 01
General Description
The LD7261 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
LD7261 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 LD7261 is available in a space-saving MSOP-10
package and is ideal for DSC flash unit.
Features
• Adjustable Charging Current
• Adjustable Output Voltage
• Supports Auto Refresh
• 1.8V~5V Battery Voltage Range
• Internal Soft Start
• Tiny Transformer
• Totem-Pole IGBT Driver
Applications
• DSC Flash Unit
• Film Camera Flash Unit
g Patented
Typical Application
VOUT
C2
160µF
ZD1
300V
D1 T1
VCC
C3
1µF
VIN
C1
33µF
VDD
C4 R2
R1 0.1µF 1M
100K
READY
IGBT RG
GATE
VCC OUT1
FB
SEC
ISET
RS CS
3.9Ω
LD7261
CHARGE
READY
CHARGE
OUT2
TRIGGER TRIGGER
GND
Q1
RI
Q1: AOS / AO3402,
T1: 10T: 250T, LP=8µH / EFD 6.5 (12T: 300T, LP=10µH/EFD6.5)
ZD1:Origin / FC0300M
CS: 4.7~10nF
RI: >600K
Fig. 1
Leadtrend Technology Corporation
LD7261-DS-01 March, 2005
1
1 page  
Typical Performance Characteristics
VOUT
Ready
LD7261
VOUT
Ready
Charge
IIN
Charge
IIN
Fig. 2 Charging waveform VIN=3.0V
VOUT
Trigger
Fig. 3 Charging waveform VIN=2.0V
VOUT
iIN
Charge
Trigger
Fig. 4 Trigger waveform
1.16
1.15
1.14
1.13
1.12
1.11
1.10 -20
0 20 40 60
Temperature
80
Fig. 6 FB Voltage vs. Temperature
Fig. 5 Recharging waveform VIN=3.0V
6.0
5.5
5.0
4.5
4.0
3.5
3.0
-20
0 20 40 60
Temperature
80
Fig. 7 Max. on Time vs. Temperature
Leadtrend Technology Corporation
LD7261-DS-01 March, 2005
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LD7261.PDF ] | |
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