Photoflash Capacitor Charger
LD7261A
3/10/2005
Photoflash Capacitor Charger for DSC
Target Spec. REV: 00
General Description
The LD7261A is an ideal...
Description
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
Pin Configuration
ISET READY TRIGGER VCC OUT1
MSOP-10 (TOP VIEW)
10 9 8 7 6
TOP MARK YYWWPP
YY: Year code WW: week code PP: production code
12345
LD7261A
FB CHARGE
SEC GND OUT2
Ordering Information
Part number LD7261APL
Package MSOP-10 (PB FREE)
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