LD7268A

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 Pin Configuration ISET READY TRIGGER VCC OUT1 MSOP-10 (TOP VIEW) 10 9 8 7 6 TOP MARK YYWWPP 12345 YY: Year code WW: Week code PP: Production code LD7268A FB CHARGE SEC GND OUT2 Ordering Information Part number LD7268APL Package MSOP-10 (PB FREE) Top Mark 7268AP...