LT3750 is a flyback converter designed to rapidly charge large capacitors to a user-adjustable target voltage. A patented boundary mode control scheme* minimizes transition losses and reduces transformer size. The transformer turns ratio and two external resistors easily adjust the output voltage. A low 78mV current sense accurately limits peak switch current and also helps to maximize efficiency. With a wide input voltage range, this device an operate from a variety of power sources. A typical application can charge a 100µF capacitor to 300V in less than 300ms. The CHARGE pin gives full control of the device to the user. The DONE pin indicates when the capacitor has reached its programmed value and the part has stopped charging. It is widely used in applications such as emergency warning beacons, professional photoflash systems, security/inventory control systems, high voltage power supply, electric fences, detonators etc.