Milpitas, Calif.—Linear Technology's LT3750 flyback controller, using an external MOSFET, can rapidly charge large capacitors to voltages as high as 1,000 volts. The chip can charge a 100 microfarad capacitor to 300 volts in less than 300 ms, thus suiting the LT3750 to professional photoflash systems, RF security, inventory control systems, and specialized high voltage power supplies.
The chip features a patented boundary mode control scheme to minimize transition losses and reduce transformer size. The LT3750's primary-side sensing topology eliminates the need for an external output voltage divider. Charging efficiency is greater than 90 percent. Current sensing accurately limits peak switch current while optimizing efficiency. Output voltages can be easily adjusted using the transformer turns ratio and two external resistors. Additional features include a charge pin, offering full control of the LT3750 to the user and a "done" pin that indicates when the capacitor has reached its programmed value and has stopped charging.
Click here to access the product datasheet. The LT3750EMS is available from stock in a 10-lead MSOP-10 package. 1,000-piece pricing starts at $3.50 each.
Linear Technology, 1-800-4LINEAR, www.linear.com