LT3751

LT3751 High Voltage Capacitor Charger Controller with Regulation FEATURES nn Charges Any Size Capacitor nn Low Noise Output in Voltage Regulation Mode nn Stable Operation Under a No-Load Condition nn Integrated 2A MOSFET Gate Driver with Rail-to-Rail Operation for VCC ≤ 8V nn Selectable 5.6V or 10.5V Internal Gate Drive Voltage Clamp nn User-Selectable Over/Undervoltage Detect nn Easily Adjustable Output Voltage nn Primary or Secondary Side Output Voltage Sense nn Wide Input VCC Voltage Range (5V to 24V) nn Available in 20-Pin QFN 4mm × 5mm and 20-Lead TSSOP Packages APPLICATIONS nn High Voltage Regulated Supply nn High Voltage Capacitor Charger nn Professional Photoflash Systems nn Emergency Strobe nn Security/Inventory Control Systems nn Detonators DESCRIPTION The LT®3751 is a high input voltage capable flyback controller designed to rapidly charge a large capacitor to a user-adjustable high target voltage set by the transformer turns ratio and three external resistors. Optionally, a feedback pin can be used to provide a low noise high voltage regulated output. The LT3751 has an integrated rail-to-rail MOSFET gate driver that allows for efficient operation down to 4.75V. A low 106mV differential current sense threshold voltage accurately limits the peak switch current. Added protection is provided via user-selectable overvoltage and undervoltage lockouts for both VCC and VTRANS. A typical application can charge a 1000µF capacitor to 500V in less than one second. The CHARG...