LD7261A

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) Top Ma...