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Flyback controller can rapidly charge large capacitors to 1,000V

Posted: 06 Mar 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Linear Technology? flyback controller? LT3750?

Linear Technology Corp. unveiled a flyback controller designed to rapidly charge large capacitors to voltages as high as 1,000V.

The new LT3750 controller drives an external high current N-Channel MOSFET and can charge a 100?F capacitor to 300V in less than 300ms. Its input voltage range of 3V to 24V enables it to operate from a variety of power sources, while its patented boundary mode control scheme minimizes transition losses and reduces transformer size.

According to the press release, the new product's primary-side sensing topology eliminates the need for an external output voltage divider. It uses a single high current N-Channel MOSFET and delivers charging efficiencies above 90 percent. A low 78mV current sense 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.

The LT3750EMS is available from stock in a 10-lead MSOP-10 package. Pricing for 1,000-piece orders starts at $3.50 each.




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? LT3750 Capacitor Charger Controller ICs, Interface

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